Correction process for internal defects of titanium alloy pipes and titanium pipe welds

The internal shortcomings of Titanium Alloy Seamless Rectangular Tube welds, lack of penetration, refers to a defect in which the workpiece and the weld metal or the part between the weld layers are not fused. Incomplete penetration weakens the welding seam working section, constitutes severe stress concentration, greatly reduces the joint strength, and it often becomes the source of weld cracking. There is non-metallic slag in the slag inclusion weld, which is called slag inclusion. The slag inclusion reduces the working section of the weld, and constitutes a stress concentration, which will reduce the strength and impact toughness of the weld.

When the pore weld metal absorbs too much gas (such as H2) or the gas (such as CO) generated by the internal metallurgical reaction of the molten pool at high temperature, it is too late to be discharged when the molten pool is cooled and condensed and is formed inside or on the outside of the weld Holes are pores. The existence of pores reduces the useful working section of the weld and reduces the mechanical strength of the joint. If there are penetrating or continuous pores, it will severely affect the tightness of the weldment. During or after welding, cracks in the metal part of the welded joint area are called cracks. Cracks can occur in the weld, and can also occur in the heat-affected zone on both sides of the weld. Sometimes it occurs on the outside of the metal, and sometimes inside the metal.

Usually, according to the mechanism of crack occurrence, it can be divided into two types: hot crack and cold crack. Thermal cracks occur during the crystallization process from liquid to solid in the weld metal, and most of them occur in the weld metal. The main reason for its occurrence is the presence of low melting point substances (such as FeS, melting point 1193°C) in the weld, which weakens the contact between the grains. When subjected to greater welding stress effects, it simply causes cracks between the grains. . When the weldment and electrode contain a lot of impurities such as S and Cu, thermal cracking simply occurs. Thermal cracks have the characteristic of spreading along the grain boundary. When the crack penetrates the surface and communicates with the outside, it has a significant hydrogenation tendency. Cold cracks occur during the cooling process after welding, mostly on the base metal or the fusion line between the base metal and the weld. The primary reason for this is that the quenching arrangement is formed in the heat-affected zone of the weld. Under the effect of high stress, it causes cracks in the crystal grains. When welding easy-quenchable ASTM B861 25*1.2mm Titanium Tube For Chemical with high carbon content or more alloying elements, The most prone to cold cracks. Too much hydrogen melted into the weld can also cause cold cracks. Cracks are one of the riskiest shortcomings. In addition to reducing the load-bearing section, severe stress accumulation will occur. During use, the cracks will gradually expand and eventually cause damage to the components. Therefore, such shortcomings are usually not allowed in the welding layout. 

Drilling of titanium alloy

When drilling titanium alloys, it is easy to generate long and thin curled chips. At the same time, the drilling head is large, and it is easy for the chips to accumulate excessively or stick to the drilling edge. This is the main reason for the difficulty in drilling Grade 9 Ti3Al2.5V Titanium Pipe. Use short and sharp drills and low-speed forced feed for drilling. The support brackets must be tightened and adequately cooled repeatedly, especially for deep hole drilling. During the drilling process, the drill bit should be kept in the drilling state and not allowed to run idly in the hole, and the drilling speed should be kept at a low and constant speed. Drill through holes carefully. When it is about to drill through, in order to clean the drill bit and drill hole, and remove drill chips, it is best to return the drill bit, and use forced feed when the hole is finally broken, so that a smooth hole can be obtained.

The occurrence of cracks in the titanium plate and the countermeasures

Titanium weld cracks are cold cracks, mainly caused by hydrogen in the weld. The main sources of hydrogen are moisture and oil in the grade 5 titanium plate and surgical medical titanium wire, and environmental humidity is the main reason for the increase in hydrogen in the weld.

Under the action of high temperature during welding, a large amount of hydrogen is dissolved in the molten pool. During the cooling and solidification process of the weld, due to the rapid decrease in solubility, hydrogen easily escapes. If the welding seam cooling rate is too fast, the hydrogen will not escape and remain in the welding seam, which will make the hydrogen in the welding seam supersaturated, so the hydrogen must be diffused as much as possible and promote the further embrittlement of this area.

If there is a notch effect in this part and the hydrogen concentration is high enough, cracks may occur. Especially in winter construction, the ambient temperature is low, and water vapor adheres to the titanium plate, creating conditions for hydrogenation of the weld. Because the titanium plate is too thin (1.2mm), the steel plate "eats warm" and the temperature rises slowly, and the corresponding titanium composite layer welding seam cools too fast. During the cooling process, the residual hydrogen in the welding seam is too late to escape. It exists in the form of supersaturation in the weld, which eventually leads to the appearance of cracks.

Therefore, during the welding process of the titanium steel clad plate, the surface of the base material and welding wire must be carefully cleaned, and the ambient temperature must not be lower than 5°C. During winter construction, flames are used to preheat the base steel surface, one is to remove the moisture around the weld; the other is to increase the temperature of the weldment and reduce the cooling rate of the weld.

Processing and preservation corrosion problems of titanium alloy fasteners

In the machining and production process of titanium alloy fasteners, because the degree of tightness of the mechanical parts is relatively not so high when the fasteners are installed, it is easy to produce a certain gap, so that there will be a surface between the metal gaps. Paint flows in, which makes the fasteners susceptible to corrosion during the production process. In the subsequent use process, the tightness of the connection will be affected. The high corrosion resistance of titanium alloy materials is due to the presence of oxygen in the air. After the Titanium Wing Nut and oxygen undergo an oxidation reaction, a protective film is formed on the surface. This layer of film can effectively protect the titanium alloy inside the material from being oxidized, thereby improving the corrosion resistance of the titanium alloy material. However, in the actual machining process of titanium alloy fasteners, due to the constant changes in the environment, including the temperature and humidity of the surrounding environment, and the oxidation of equipment during the processing, it will lead to titanium alloy fasteners. Corrosion is easy to occur, which is one of the problems that titanium alloy fasteners are prone to in the production process.

Analysis of Weldability of Titanium

Titanium has the characteristics of corrosion resistance, low thermal conductivity, and good heat resistance. It is a good choice for condenser tubes in power plants. At the same time, titanium has high chemical activity, which makes it suitable for welding seams and welding. The dirt on the surface of the material is very sensitive, and preparations must be made before welding, and strict purity inspection of the welding shielding gas must be carried out to minimize the moisture content in the shielding gas.

Good corrosion resistance

Titanium is a very active metal, its equilibrium potential is very low, and the thermodynamic corrosion tendency in the medium is high. But in fact, titanium is very stable in many media. For example, titanium is corrosion-resistant in oxidizing, neutral and weak reducing media. This is because titanium exhaust flange and oxygen have a great affinity. In the air or in an oxygen-containing medium, a dense, strong adhesion and an inert oxide film are formed on the surface of titanium, which protects the titanium matrix from corrosion. Even due to mechanical wear, it will quickly heal itself or regenerate.

This shows that titanium is a metal with a strong tendency to passivation. The medium temperature of titanium is below 315 ℃, and its oxide film always maintains this characteristic.

Low thermal conductivity

The thermal conductivity of titanium is small, 1/5 of low carbon steel and 1/25 of copper.

Good heat resistance

The new titanium alloy can be used for a long time at a temperature of 600°C or higher.

Welding characteristics of titanium

At room temperature, due to the extremely dense surface passivation layer, titanium is very stable. However, as the temperature rises, its absorption capacity for oxygen, hydrogen and nitrogen continues to increase. In the atmosphere, titanium starts to absorb hydrogen at 250 ℃, oxygen at 400 ℃, and nitrogen at 600 ℃. After these elements are absorbed by titanium, it will obviously increase the hardness of titanium and cause embrittlement, which will affect the performance of titanium metal. Therefore, in the welding process, effective protective measures must be taken to avoid air pollution and the effects of oxygen and nitrogen. Before welding, it must be ensured that there is no grease or other hydrocarbons on the surface of the welded metal.

In addition, iron has a great influence on Grade 5 Ti-6Al-4V Titanium Plate. Iron ions are easy to form titanium-iron compounds in titanium, form galvanic cells in the welding area, corrode the oxide film on the surface of titanium metal, and leave opportunities for hydrogen to enter and cause hydrogen embrittlement.

Due to the high melting point, large heat capacity, and poor thermal conductivity of titanium, the weld and heat-affected zone are easy to grow grains under the action of the welding thermal cycle, which reduces the plasticity and toughness of the welded joint. If larger process parameters are used, the crystal grains will be coarser, so low current process parameters should be used and the interlayer temperature should be controlled.

What are the precautions for titanium tube processing?

1. When installing titanium and titanium alloy pipes, please pay attention not to contact or collide with iron materials when transporting and storing titanium and titanium alloy pipes.

2. The cutting of titanium and titanium alloy pipes should be made by mechanical methods, and the cutting speed should be low; when titanium welded pipes are cut or reground with grinding wheels, special grinding wheels should be used; flame cutting should not be used. The groove should be processed by mechanical methods.

3. Inert gas shielded welding or vacuum welding should be used for welding titanium and titanium alloy pipes. Oxygen-acetylene welding or carbon dioxide gas shielded welding should not be used, and ordinary manual arc welding should not be used.

4. When installing titanium and Grade 9 Ti3Al2.5V Titanium Tubes, it is not allowed to use iron tools and materials to knock and squeeze; rubber or soft plastic plates should be padded between the carbon steel supports and hangers and the titanium and titanium alloy pipes to make them Do not directly contact with titanium and titanium alloy pipelines; when the titanium and titanium alloy pipelines pass through walls and floors, casings should be installed, the gap should not be less than 10mm, and the insulation should be filled. The insulation should not contain iron impurities.

5. Titanium and titanium alloy pipes are not suitable for direct welding connection with other metal pipes. When the connection is required, a loose flange connection can be used. The non-metallic gaskets used are generally rubber gaskets or plastic gaskets, and the chloride ion content should not exceed 25ppm.

Welding conditions of titanium screws

What are the welding conditions for titanium metric screws? Industrial titanium screws can be welded by contact welding without special preparation. When there is a relatively thick oxide film, it needs to be cleaned mechanically or removed in a 5% hydrofluoric acid solution.

Arc welding of titanium screws is carried out in clean gas, and direct current can be used to achieve better results. At this time, the tungsten electrode is the cathode.

The direct welding of titanium screws with nickel, Bromo-chromium alloys, and other nickel-containing alloys is not suitable because of the formation of harmful fusible eutectics. Between materials of different properties, molybdenum, tantalum, or niobium spacers with a thickness of fifteen to twenty microns are required. This method can eliminate the contamination of the connection area by other elements because the dissolution process does not require special solder and pre-metallization. It can obtain a high-quality vacuum dense connection, this method is promising for titanium screws.

Application of titanium alloy materials in the fields of offshore oil drilling and ocean thermal energy conversion

In ocean engineering, titanium and titanium alloy materials are used in seawater desalination, oil and ocean drilling, and ocean thermal energy conversion power stations.

1) Seawater desalination.

There are many methods of seawater desalination. At present, evaporation methods are mostly used in the world. Among them, the multi-stage rapid evaporation method (MSF) used accounts for 67%. Because seawater is very corrosive to the tube material under the conditions of high temperature and high flow rate, many tubes, Especially the tubes of the heating part are mostly made of titanium alloy materials (such as titanium tubes).

2) Offshore oil drilling.

On the ocean platform. Grade 9 Ti3Al2.5V Titanium Pipe is used to make condensing pipes and heat exchange pipes, pumps, valves, pipe fittings, etc. of closed-cycle engines; in deep-sea drilling and production of subsea oil, it is used as riser pipes, pre-stressed pipe joints, fixtures and accessories.

3) Ocean thermal energy conversion project.

In an ocean thermal energy conversion power station, the power system, especially the heat exchanger, is the equipment with the highest metal usage rate. Since the overall cycle efficiency is low, the heat exchanger must be large. The design principle of power station system should be long life (up to 30 years) and low maintenance. Therefore, when selecting materials, materials and manufacturing costs and corrosion properties of materials must be considered comprehensively. titanium heat exchanger tube is undoubtedly the most competitive material. In addition, in terms of geothermal energy, titanium is widely used due to its corrosion resistance to sea water, sulfur-containing gases, chlorides, etc., and the advantages of high specific strength.

Application, classification, and performance of titanium nickel alloy wire

1. Application fields: used in super-elastic memory alloy mobile phone antennas, fishing hooks, fishing rods, children's toy antennas, optical glasses frames, Bluetooth headsets, ear hooks, and medical. With the development of the times, it has gradually been used in women's clothing support circles, as scientific research materials, and frequently appeared in the material laboratories of various universities of science and technology.

2. Product characteristics: It has mechanical properties and corrosion resistance, and has a memory function that can restore the memory shape at the phase transition temperature. Gr5 Ti-6Al-4V Titanium Wire

3. Product classification: temperature memory and elastic memory.

4. Advantages: Super memory, superelasticity, small size, lightweight, low power, high strength, precise control, AC or DC activation, long life, linear motion.

Physical properties of titanium-nickel alloy memory wire:

Tensile strength: 850 MPa Yield strength: 195～690 MPa Elongation: 25～50%

Chemical composition: Ni: 55.4% --56.2% C≤0.07 H≤0.005 O≤0.050 N:≤0.05

After this kind of memory, metal is deformed, under certain external effects, such as high pressure, high temperature, low temperature, electricity, and other special conditions, it can be restored to its previous state. Memory metal has a wide range of applications, and all its properties change with temperature. From a microscopic point of view, the atoms of memory metals (metals are made up of atoms, notions, or molecules) have a unique configuration in space structure. After external forces change their macroscopic shape, under certain conditions, their space structure may be Will recover.

Performance of titanium aeration head

Titanium aeration head filtration is a deep filtration. With the continuation of the filtration time, a dense filter layer with gaps will be formed on the surface of the titanium rod to further filter, and the particles can also be tightly attached to the wall of the channel to form a "frame" "Bridge phenomenon", intercepts particles smaller than the pore size of the titanium rod, and improves the filtration accuracy. The thermal stability and chemical stability of the powder sintered Titanium Alloy Threaded Rod core make it have the characteristics of corrosion resistance, high temperature resistance, impact resistance, non-toxicity, no particle shedding, no absorption of chemical components, long service life, and easy cleaning and regeneration.

Main performance:

1. Uniform structure, narrow pore size distribution and high separation efficiency.

2. High porosity, low filtration resistance and high penetration efficiency.

3. High temperature resistance, generally can be used normally below 280 degrees.

4. Good chemical stability, acid and alkali corrosion resistance, and oxidation resistance.

5. No particles fall off, no secondary pollution to the original liquid, and it meets the requirements of food hygiene and pharmaceutical GMP.

6. Good mechanical properties, press filter and suction filter, simple operation.

7. Low pressure difference, small footprint and large flow.

8. Strong anti-microbial ability, does not interact with microorganisms.

9. The molding process is good, and the overall length without welding can reach 1000 mm.

10. It can be regenerated online, is easy to clean, and has a long service life (usually for membrane filter elements)

Supply of water treatment microporous sintering integrated forming aeration head with its unique performance, can be widely used in the pharmaceutical industry, water treatment industry, food industry, bioengineering, chemical industry, petrochemical industry, metallurgical industry and gas purification fields. It is a new material with broad development prospects.

Demystifying the unknown features of titanium coils

The strength of titanium alloy titanium coil is higher than that of fine steel. Titanium alloy has good heat resistance, low-temperature toughness, and fracture toughness. Titanium equipment is mostly used for aircraft and other parts and rocket, missile structural parts, and titanium installation equipment.

Gr5 Ti-6Al-4V Titanium Foil is bright, light, strong, and has quite good corrosion resistance. The metal made of titanium material will not deform, will not fade, and it is easy to maintain. As long as it is gently wiped with a cotton cloth, it will restore its luster and operate. The longer the time, the better the brightness.

Titanium has stable chemical properties and good biocompatibility. In the human body, it can resist the erosion of exudate, has no harm to people's body, and conforms to arbitrary sterilization methods. Because the titanium in the titanium coil has a fairly high corrosion resistance and stability, there will be no chemical reaction between the material and the drying time, so it is a metal that has no effect on people's autonomic nerves and taste, and will not cause Overreaction.

Pure titanium is non-magnetic and has very low thermal conductivity at high temperatures. In addition, pure titanium is in a semi-reflective state under X-rays, and metal artifacts will not appear in MRI examinations. Gr2 Pure Titanium Foil has high requirements on processing technology due to its high strength, high metal elasticity, and poor ductility.

Features:

1. It has excellent corrosion resistance in a variety of media, and the tube wall is thinner, which increases the heat transfer efficiency.

2. The surface is smooth and has no fouling layer, and the fouling coefficient is greatly reduced.

3. Low density, high strength, small size and light weight.

The titanium in the titanium coil has excellent physical and chemical properties, low density, light weight, high strength, good corrosion resistance, mechanical properties and weldability, making it used in many fields: for chemical equipment, offshore power generation Equipment, seawater desalination equipment, ship parts, electroplating industry and other industries. The corrosion resistance is 15% stronger than stainless steel, and the service life is about 10% longer than stainless steel.

The influence of laser welding on the surface treatment of titanium rods!

The process parameters of laser welding are difficult to grasp, because the thermal efficiency fluctuates greatly during the welding process, and the surface condition of the welded titanium rod has a great influence on the thermal efficiency: the brighter the surface, the larger the emitted laser light, and most of the laser energy is reflected to other objects , In the form of "heat" to the surrounding materials or media. But the thermal efficiency will suddenly change. Before the titanium metal rod is melted, only about 10%-20% of the light energy is absorbed by the titanium metal rod and heats the titanium metal rod. When the temperature rises to the melting point of the weld metal and starts to melt, the light absorption rate of the Grade 5 Ti-6Al-4V Titanium Bar increases sharply . The titanium rod company tells you that at this time, about 60%-80% of the light capacity is absorbed by the metal, and the sudden change in the thermal effect can easily cause the weld to burn through.

In order to avoid or reduce this adverse effect, ASTM F136 6Al-4V ELI Titanium Bar tells you that you can take corresponding measures, such as welding titanium metal rods; roughening the surface, using pulsed laser beams; adjusting the input energy; adjusting the spot size; changing the attenuation wave Pulse width and steepness.

A natural ruby ​​crystal containing alumina and dissolving low concentration of chromium atoms is used as the working material of the laser generator, which is called a solid-state laser generator. If CO2 is used as the working substance of the laser generator, it is called the force gas laser generator.

At present, the power of the laser welding machine is only kilowatts, and the price is expensive, the welding cost is high, and the application range is not wide. It is only used for the solder joints of some small parts in the production of some instruments and meters, especially when some solder joints are hidden and cannot be welded by ordinary welding methods. Multi-station welding can be realized by using laser beam, optical fiber and deflection prism.

What is the difference between titanium wire and titanium welding wire

Pure titanium wire is divided into structural titanium wire, titanium welding wire, titanium hanger wire, medical titanium wire, etc. according to its chemical composition. The chemical composition of titanium wire for structural parts is implemented in accordance with GB/T3620. There are many implementation standards for the chemical composition of titanium welding wire, and the commonly used titanium wire manufacturers are GB/T3623, AWS A5.16. The chemical composition requirements of titanium wire for structural parts are stricter. The standard composition requirement of titanium wire is lower than that of GB/T3620, so the price is also lower, and the market price is between 80 and 100. The chemical composition requirements of medical titanium wire are generally consistent with those of GB/T3620, but the hydrogen content should not exceed 0.01%.

Titanium welding wire is a series of titanium welding filler wires to solve the welding of standard titanium and titanium alloys such as TA1, TA2, TA3, TA5, TA6, TA7, TC1, TC2, TC4, TC6, TC9, TC10, TC11, etc. These filler metals are usually used to weld industrial pure titanium. In these filler metals, from ERTi-1 to ERTi-4, impurity elements gradually increased slightly. ERTi-5 Titanium Alloy Welding Wire TA5 Welding Wire This filler metal is mainly used to weld Ti-6Al-4V alloy commonly referred to as "6-4" titanium and is the most widely used in titanium tig welding wire. ERTi-6 titanium alloy welding wire TA6 welding wire is mainly used for welding Ti-5Al-2.5Sn alloy, which has good weldability. The weld metal formed by the filler metal of TC1 welding wire has excellent corrosion resistance, and its mechanical and physical properties are similar to ERTi-2. Titanium plate ERTi-9 titanium alloy welding wire TC9 welding wire, the filler metal of aluminum and vanadium content is about the average in ERTi-5, so it is also called "semi 6-4" titanium.

Processing technology of titanium and titanium alloy block

Plastic processing of titanium and titanium alloys has the characteristics of large deformation resistance, plastic difference at room temperature, high yield limit and strength limit ratio, large springback, sensitivity to notches, easy adhesion to the mold during deformation, and easy absorption of harmful gases when heated. Plastic processing is more difficult than steel and copper. Therefore, the processing technology of titanium and titanium alloys must take these characteristics into consideration. Titanium adopts plastic processing, the processing size is not limited, and it can be mass-produced, but the yield rate is low, and a large amount of scraps and residues are generated during the processing.

Aiming at the above shortcomings of titanium plastic processing, powder metallurgy technology for titanium alloy blocks has been developed in recent years. The powder metallurgy process of Grade 5 Ti-6Al-4V Titanium Wire is the same as ordinary powder metallurgy, but the sintering must be carried out under vacuum. It is suitable for the production of large-volume, small-sized parts, and is especially suitable for the production of complex parts.

This method requires almost no processing and has a high yield rate. It can not only make full use of titanium waste as raw materials, but also reduce production costs, but it cannot produce large-size titanium parts. The powder metallurgy process of titanium is: titanium powder (or titanium alloy powder)-screening-mixing-press forming-sintering-auxiliary processing-titanium products. The processing in the above process refers to plastic processing and casting. Plastic processing methods include forging, extrusion, rolling, stretching and so on.

The Grade 9 Ti3Al2.5V Titanium Pipe ingot is processed into various sizes of cakes, rings, plates, pipe trees, bars, profiles and other products. Casting methods can also be used to pores, and the corrosion resistance is reduced; therefore, inert gas or vacuum protection is used when titanium welding; welding; Recrystallization is easy to occur in the place, especially β-titanium, which causes coarse crystals, resulting in a decrease in ductility at this place; in addition, the deformation of titanium is large when welding, and it is difficult to correct.

What are the applications of titanium wire and titanium alloy wire

Titanium and titanium alloy materials, as the best in metal materials, have a series of excellent properties that other metal materials can’t match. Therefore, they have developed rapidly in recent years and have been rapidly and widely used in high-tech fields such as aerospace and military industries. Grade 1 Pure Titanium Wire manufacturers in the United States, Russia, Japan, China and other countries all over the world attach great importance to the research and development of titanium alloys, continue to develop new types of titanium alloy materials, and expand the application of titanium and titanium alloys. Due to the continuous deepening of research and the increase of product series, many titanium products, such as titanium wire, have increasingly entered the fields of various civilian consumer products.

1. Classification of titanium wire

Titanium can be divided into pure titanium and titanium alloy based on whether it contains alloying elements, and titanium alloy can be divided into α titanium alloy and near α type alloy, (α+β) type alloy, and near β type according to its composition and room temperature structure. Alloys and β-type alloys. Titanium and titanium alloys can be used to produce wires with different usage requirements according to different properties. The finished products of titanium and Gr2 Pure Titanium Wire are generally hard (Y) and annealed (M).

2. Application of titanium wire

Pure titanium wire has good corrosion resistance, high specific strength, non-magnetic, high biocompatibility, low impedance to ultrasound, high sound transmission coefficient, hydrogen storage and better shape memory function. The excellent characteristics of use value have produced important applications in many fields such as aerospace, petrochemical, medical and health, automobiles, construction, and sports and leisure products.

Application of titanium rod in tableware industry

Titanium is called smart metal and healthy metal. Titanium rods can be divided into pure titanium rods and titanium alloy rods. Pure titanium polished rod material: TA2; titanium alloy polished rod model: TC4 (GR5). With the increasing awareness of titanium metal, titanium metal has gradually been used in the tableware industry, in which titanium rods are used to process Grade 1 Titanium Plate chopsticks and titanium alloy chopsticks. Among them, titanium alloy rod processing chopsticks have higher gloss, but the disadvantage is that they are expensive, high hardness, and difficult to process; pure titanium chopsticks are also brighter after polishing, but the gloss is still slightly lower than that of titanium alloy. However, the performance-to-price ratio is still much higher than that of titanium alloys. First, the price of pure titanium rods is much lower than that of titanium alloy rods. Second, the hardness of pure titanium rods is better than that of low-pressure casting, so the processing cost is also lower. The specific choice of titanium rod processing depends mainly on the price accepted by the user.

The two materials of titanium rods do not contain heavy metals for environmental protection and health; the content of Gr5 Ti-6Al-4V Titanium Plate is not corroded by strong acids and alkalis, and when foods and beverages come into contact with condiments such as vinegar and salt, various foods will not rust; titanium has a natural sterilization effect. The surface of the chopsticks will not breed bacteria, and always maintain the safety and health of people's diet.

How does the principle of corrosion resistance of titanium plate come about?

As we all know, titanium plate is a kind of metal material with great corrosion resistance? So how exactly is the corrosion resistance of titanium produced? In the mysterious titanium world, let us solve its mysteries one by one. Titanium plus tool corrosion resistance, so everyone usually thinks it is an inert metal, but on the contrary, Molybdenum Sputtering Target is actually a very active metal, its equilibrium potential is very low, and the thermodynamic corrosion tendency in the medium is large, but in fact, Titanium is very stable in many media. For example, Grade 7 Titanium Plate is corrosion-resistant in oxidizing, neutral, and weakly reducing media.

This is because the titanium rectangular rod has a great affinity with oxygen. In the air or in an oxygen-containing medium, a dense, strong adhesion and inert oxide film will form on the surface of the titanium, which protects the titanium matrix from corrosion. Even due to mechanical wear, it will quickly heal itself or regenerate an oxide film. This indicates that titanium is a metal with a strong tendency to passivation, and the titanium oxide film always maintains this characteristic when the medium temperature is below 315℃.

Application of Titanium Alloy in Onshore Oil and Gas Exploration and Development

Oil and natural gas exploration and development can be divided into land exploitation and offshore exploitation. The oil and natural gas contained in the earth's crust roughly accounts for 60% of the land and 40% of the offshore oil. There is also the exploitation of offshore oil and gas in the submarine crust such as the Bohai Sea and the South China Sea. Significantly.

Before the industrialization and large-scale application of Grade 1 Titanium Plate, the shells of commonly used logging tools were made of 45 steel, 40Cr steel, and 30 MoVNb steel, but none of them could meet the needs of modern logging technology. Modern high-tech oil and gas exploration And the development requires that the metal shell of the logging tool can withstand the pressure> 98 MPa, but also resist the corrosion of underground crude oil and various media. In addition, it has a low absorption rate of natural γ-rays during logging. , It should not have a shielding effect on the earth's magnetic field. From these performance requirements, Gr5 Ti-6Al-4V Titanium Plate is a good material for the casing of logging tools.

Cutting performance of titanium alloy plate material

The high-efficiency cutting technology of titanium alloy materials is the key technology that the industry pays attention to, which fully reflects the connotation of "science and technology is the first productive force". Through the cutting practice of titanium alloy material blisk and compressor casing, it summarizes the titanium alloy cutting characteristics, cutting tool materials, tool structure, acquisition of titanium alloy high-efficiency cutting parameters, and the technology adopted to improve tool durability and processing efficiency. Countermeasures, I hope it can serve as a reference.

In order to improve the reliability and thrust of the engine, advanced and high-performance engines have adopted a large number of new materials, their structures are becoming more and more complex, and the requirements for machining accuracy are getting higher and higher, which puts forward higher requirements on the manufacturing process. In the improvement of the performance of the new generation of aero-engines, the contribution rate of manufacturing technology and materials is 50%~70%; in terms of engine weight reduction, the contribution rate of manufacturing technology and materials accounts for 70%~80%, which also fully shows that advanced High-quality Grade 7 Titanium Sheet materials and processes are the keys to reducing weight, increasing efficiency and improving the performance of aero engines.

Titanium alloy materials are more and more widely used in the aviation field due to their excellent properties such as high specific strength, low density, corrosion resistance, high-temperature resistance, and good weldability. Based on the above advantages, titanium alloy materials have become the material of choice for some parts.

Cutting characteristics of titanium alloy materials:

Some physical and mechanical properties of titanium alloys have brought greater difficulty to cutting. The small deformation coefficient during cutting of titanium alloy increases the sliding friction distance of chips on the rake face and accelerates tool wear. Titanium alloy has a small thermal conductivity, and the heat generated during cutting is not easily transmitted, and it is concentrated in a small area near the cutting edge. The modulus of elasticity of Grade 9 Ti-3Al-2.5V Titanium Plate is small, and it is easy to produce bending deformation under the action of radial force during processing, which can cause vibration, increase tool wear and affect the accuracy of parts. Due to the strong chemical affinity of titanium alloy to the tool material, the tool is prone to bond wear under the conditions of high cutting temperature and large cutting force per unit area.

What are the welding requirements for titanium plates

Titanium will react with oxygen and other gases at high temperatures to cause hardening. The ductility of the welding gap will decrease when the Grade 12 Titanium Sheet manufacturer is welding, resulting in pores, and the corrosion resistance is reduced; therefore, inert gas or vacuum protection is used when welding titanium; Recrystallization is easy to occur, especially β-titanium, which causes coarse crystals, which leads to a decrease in ductility at the place; in addition, the deformation of titanium is large when welding, and it is difficult to correct.

The general welding methods of titanium: TIG, MIG, resistance welding, plasma welding, particle beam welding, laser welding, etc. After welding, annealing treatment for stress relief or solution aging treatment or even double solution aging treatment is required to improve its Strength, toughness and fatigue resistance; for such a wide range of applications, we should have some understanding of its properties. As a metal, Grade 1 Titanium Plate has three characteristics:

  1. Does not rust

  2. Light weight, density is only 4.51

　　3. High strength (tensile strength 28—160kgf/mm)