How to ensure the quality of titanium welded pipes?

As an important pipeline material, the quality of titanium welded pipes is directly related to the safety and reliability of the project. In order to ensure the quality of titanium welded pipes, the following aspects can be controlled:

1. Choose good raw materials. The quality of titanium welded pipes is greatly affected by raw materials, so you should choose a reliable raw material supplier and strictly control the quality of raw materials. Titanium alloy is a rare metal with a high price, so it is easy to use inferior materials to impersonate. It is very necessary to strictly inspect and identify the raw materials.

2. Strictly control the production process. The process of producing titanium welded pipes generally includes extrusion, rolling, welding and other links. The process parameters of each link should be strictly controlled and inspected. Ensure that the operator has relevant operating certificates and experience, select appropriate equipment and processes, and ensure the quality of each pipe. 3 Inch Titanium Pipe / Gr1 Pure Titanium Pipe / Grade 3 Pure Titanium Pipe / ams 4944 seamless pipe

3. Strict quality inspection. A complete quality management system should be established during the production process, and various quality tests should be carried out on the products regularly, including chemical composition, mechanical properties, metallographic structure, dimensional accuracy and other aspects. Only through strict inspection and control can we ensure that the products meet the standard requirements.

4. Strengthen after-sales service. After-sales service is an important part of ensuring product quality. Quality issues raised by users should be responded to and handled in a timely manner, and product traceability and feedback should be done well so as to promptly discover the causes of problems and take measures to improve them.

In general, ensuring the quality of titanium welded pipes requires all-round control and management, from the selection of raw materials to the control of production processes to quality inspection and after-sales service, and every link cannot be sloppy. Only by strict control and management throughout the process can good products that meet standard requirements be produced to provide guarantees for engineering safety and reliability.

Analysis of titanium forging manufacturing process technology!

I. Main forging methods of titanium forgings

1. Free forging

Applicable to forgings with simple shapes and low precision requirements, relying on manual operation, and low material utilization rate.

The process is flexible, but the deformation and hammering frequency need to be strictly controlled.

2. Die forging process

Open die forging: using a die with flash groove, controlling the metal flow in stages, and removing the flash during final forging, suitable for batch production of complex shape forgings. titanium forging / Titanium Threaded Forged Fitting / Gr3 Pure Titanium Plate

Closed die forging: flash-free design, high material utilization rate, better precision, but strict requirements on die strength and temperature control.

3. Extrusion and rolling

The extrusion process is extruded through the die hole, suitable for long strip/tube forgings, with high material density, but large equipment investment.

Rolling controls the shape through continuous deformation, with high efficiency, and can accurately adjust the size of the plate/profile.

2. Core process flow

1. Open forging

The initial temperature is selected to be 150-250℃ above the β phase transformation point, and the "light-heavy-stable" three-stage hammering strategy is adopted. Intermediate annealing is required when the cumulative deformation is greater than 70%.

Multi-directional forging cycle improves the uniformity of the organization, and the deformation of each fire is controlled at 50%-80%.

2. Special process optimization

U-shaped titanium alloy forgings adopt a "one"-shaped step billet design, which is formed by special tire molds and punches in steps. The cross-section of the bar is 1.1-1.25 times that of the rough shape to improve the accuracy.

Right-angle trapezoidal forgings optimize the deformation distribution through multi-fire forging, and the single deformation is 20%-50%.

3. Key points of quality control

1. Temperature and lubrication

The temperature fluctuation is monitored by infrared thermal imaging throughout the process, and the final forging temperature must be higher than the critical value of β brittleness to avoid cracks.

Graphite-based lubricants are used to reduce mold friction, and the R angle of the corners is greater than 15mm to prevent stress concentration.

2. Organization and defect prevention and control

β brittleness is repaired by controlling the heating temperature and plastic deformation.

The residual casting structure needs to ensure that the forging ratio is greater than 3:1, and the deformation rate in the final forging stage is dynamically adjusted.

IV. Heat treatment process

1. Quenching and tempering

α+β type titanium forgings need to be quenched after preheating at 600-650℃, and the tempering temperature is 400-500℃.

2. Solution and aging

α+β type solution treatment temperature is 980℃, and β type is treated at 775-900℃; aging temperature is 480-600℃, and it lasts for 2-16 hours to precipitate strengthening phase.

Titanium wire rolling process!

Titanium and titanium alloy wire rolling is a process of drawing titanium and titanium alloy wire billets (in coils or single pieces) to produce coiled or single wire products, including titanium iodide wire, titanium-molybdenum alloy wire, titanium-tantalum alloy wire, industrial pure titanium wire and other titanium alloy wires. Titanium iodide wire is used in instruments, meters, electronics and other industrial sectors. Ti-15Mo alloy wire is the vacuum titanium ion pump gas source material. Ti-15Ta alloy wire is the gas absorption material for the vacuum industry sector. Industrial pure titanium and other titanium alloy wires include industrial pure titanium wire, Ti-3A1 wire, Ti-4A1-0.005B wire, Ti-5 AI wire, Ti-5 Al-2.5Sn wire, Ti-5 Al-2.5Sn-3Cu-1.5Zr wire, Ti-2A1_1.5Mn wire, Ti-3A1-1.5Mn wire, Ti-5 A1-4V wire, Ti-6A1-4V wire, etc., which are used as corrosion-resistant parts, electrode materials, welding materials, etc. High-strength TB2 and TB3 alloy wires are used in the aviation and aerospace fields. Gr12 Ti-0.3Mo-0.8Ni Titanium Wire / Grade 23 Ti-6Al-4V ELI Titanium Wire / Ti45-Nb Titanium Wire

(1) Heating system and final rolling temperature. The heating temperature of β-type titanium alloy before rolling is slightly lower than the (a+P)/P phase transformation temperature. The rolling process is completed in the a+P phase region; the titanium alloy of type A is heated in the a+p phase region; the heating temperature of type B titanium alloy is higher than the p transformation temperature. The heating time is calculated as 1~1.5mm/min. The pre-rolling heating temperature of titanium and titanium alloy billets and the final rolling temperature of profiles are basically the same as the final rolling temperature of rolled bars.

(2) Selection of other process parameters. Due to the large output of titanium and titanium alloy rolled profiles, the product length should not be too short and the rolling speed should not be too high. In the actual production process, the rolling speed used is generally 1~3m/s.

(3) According to the deformation resistance, width and elongation of titanium alloy, select the roller hole type suitable for various steel profiles of titanium alloy to roll titanium alloy profiles. If the batch of titanium alloy profiles is large, a titanium alloy-specific roller hole type can be designed according to the characteristics of titanium alloy to roll titanium alloy profiles.

GR9 Titanium Alloy Tube Purchase Guide

I. Selection of GR9 Key Parameters

Specification Matching

Outer Diameter and Wall Thickness: Common outer diameter range is 16-150mm, wall thickness is 0.5-7mm, and thin-walled or thick-walled tubes need to be selected according to pressure requirements.

Length: Standard tubes ≤6000mm, customized requirements need to be communicated in advance.

Delivery Status: Annealed state (M) is suitable for subsequent processing; cold-processed state (Y) can be directly used for finished products.

Performance Index

Strength: Tensile strength is about 600MPa, higher than pure titanium but lower than TC4.

Heat Resistance: Long-term use temperature ≤315℃, short-term tolerance of 450℃.

Density: 4.47g/cm³, 40% lighter than steel. Gr9 Ti3Al2.5V Titanium Tube / Thin Wall Titanium Tube / titanium exhaust pipe

2. Application scenario matching

Aerospace

Seamless pipes are preferred to ensure the high-pressure sealing of hydraulic/fuel pipelines. Cold-drawn pipes with an outer diameter of ≤65mm and a wall thickness of ≥1.5mm are recommended.

Bicycle/sports equipment

For lightweight scenes such as trekking poles and frames, seamless pipes with an outer diameter of 16-25mm and a wall thickness of 0.8-1.2mm are selected. Note that the welds need to be polished to be smooth and crack-free.

Chemical equipment

Annealed pipes are recommended for acid and alkali corrosion resistant scenes, and the surface needs to be polished to reduce the risk of medium adhesion.

3. Processing and process verification

Welding quality

TiG welding should be used for welding, and the weld width should be ≤2mm to avoid pores and unfused defects.

For high-end frames, closed welding process is recommended to reduce the risk of open welding.

Surface treatment

Chemical pipes need to be electrolytically polished, with a roughness Ra≤0.8μm; sports equipment can retain the frosted or sandblasted texture.

4. Comparison with TC4 titanium alloy

Advantages: GR9 has better cold formability and is suitable for complex bending parts.

Disadvantages: The strength is only 60%-70% of TC4, and the high temperature performance is weak, which is not suitable for scenes above 500℃.