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)

What matters should be paid attention to during the cutting process of titanium plate

In view of these chemical properties of titanium metal, what issues should be paid attention to during the cutting process of Grade 7 Titanium Sheet?

(1) If it is a semi-automatic cutting, the guide rail should be placed on the plane of the titanium plate, and then the cutting machine should be placed on the guide rail. Note that the order cannot be reversed.

(2) The cutting parameters should be appropriate, and should be reasonably determined according to the thickness of the titanium plate, so as to obtain a good cutting effect.

(3) Check whether the cutting nozzle is unblocked. If there is a blockage, it should be cleared in time.

(4) Before cutting the titanium plate, the surface should be cleaned and a certain space should be left, which can facilitate the blowing of slag.

(5) The distance between the cutting nozzle and the surface of the Grade 1 Titanium Plate should be appropriate, too close or too far is not good.

(6) The preheating of the titanium plate should be sufficient, so as not to affect the cutting process.

(7) If you are cutting workpieces of different sizes, you should cut small pieces first, and then large pieces.

The development trend of aviation titanium alloy

With the rapid development of aviation science and technology, in the face of increasing requirements for national defense construction, a new generation of aircraft must meet the requirements of ultra-high speed, high altitude, long endurance, and ultra-long range. In order to improve the reliability of aircraft, advanced aircraft and engines have increasingly increased the amount of high-performance materials such as titanium alloys, and their structures have become more and more complex. Therefore, aerospace titanium alloys will develop towards low-cost and high-performance, and at the same time continue to carry out independent research and development of new grades and the development of new processes.

Research on Strengthening Low Cost Aviation Gr23 Ti-6Al-4V ELI Titanium Sheet

The aviation industry’s requirements for materials pay more attention to the balance of performance and cost, and no longer blindly pursue high performance. Low cost will run through the entire life cycle of products such as material selection, structural design, manufacturing technology, testing and evaluation, and maintenance, reducing the cost of titanium alloys. It is the inevitable trend of industry development. Substituting ordinary Fe elements for expensive elements such as Nb, Mo, and V, and vigorously developing near-net forming technology will become the two key directions for reducing the cost of aerospace titanium alloy engineering applications.

Research on Strengthening High Performance Aerospace Titanium Alloy

Although titanium alloys have good comprehensive properties, the existing aviation titanium alloys still cannot fully meet the high-performance requirements of the aviation industry. At present, it is difficult for high-temperature Gr9 Ti-3Al-2.5V Titanium Bar to exceed 600°C in actual long-term use. The research on aviation titanium alloys above 600°C is still in the experimental and pilot stage, and there is still a long way to go to large-scale development and application. In addition, the batch stability research and application of flame-retardant titanium alloys, high-strength, high-toughness and damage-tolerant titanium alloys have become the focus of attention of many scholars. In the future, research on high-performance aviation titanium alloys will tend to dig deeper into existing alloys and develop research on new grades of alloys at the same time.

Do you know how to carburize titanium wire?

ERTi-5 Titanium Welding Wire forms a kind of stable carbide with higher hardness with carbon. The growth of the carbonized layer between titanium and carbon is determined by the diffusion rate of titanium in the carbonized layer.

The solubility of carbon in titanium is less than 850X: the total is 0.3%, while at 600C it drops to about 0.1% B. Because the solubility of carbon in titanium is small, basically only the deposition layer through the titanium carbide layer and its lower fork domain To achieve the purpose of surface hardening. Carburizing must be carried out under the condition of removing oxygen, because the hardness of the surface layer formed by the powder that is commonly used for steel carburizing against carbon monoxide or oxygen-containing carbon monoxide reaches 2700MPa and 8500MPa, and it is easy to peel off.

In contrast, under deoxidation or decarburization conditions, a thin layer of titanium carbide may be formed when carburizing in charcoal. The hardness of this layer is 32 OUOMPa, which is consistent with the hardness of titanium carbide.

The depth of the carburized layer is roughly greater than the depth of the nitrided layer when nitriding with nitrogen under the same conditions. Under the condition of oxygen enrichment, it must be considered that the absorption of oxygen affects the depth of hardening.

Only under the condition of very thin layer thickness can the carbon powder be infiltrated in a vacuum or argon-methane atmosphere to form sufficient adhesion strength. Compared with this, the use of gas carburizing agent may form particularly hard and good adhesion. Hardened layer of titanium carbide.