Large pulse power supply heating welding method for Ti-6Al-4V titanium alloy

A welding method, ti-6al-4v technology, applied in the direction of high-frequency current welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of long welding time, large one-time investment of welding machine, high operating cost, etc., and achieve welding The effect of large part size, great application value, and economical preparation process

Inactive Publication Date: 2005-03-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the instability in the laser welding process of titanium alloy is an inherent regularity of the laser welding method.
And because (1) lasers, especially high-power continuous wave lasers, are very expensive; (2) the electro-optic conversion and overall efficiency of lasers are very low; (3) the requirements for welding interface processing, assembly, and positioning are very high; (4) )CO 2 The laser consumes He gas during operation, and the operating cost is also high, which limits the use of laser welding methods for welding Ti-6Al-4V titanium alloys
Friction

Method used

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  • Large pulse power supply heating welding method for Ti-6Al-4V titanium alloy
  • Large pulse power supply heating welding method for Ti-6Al-4V titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Take two Ti-6Al-4V titanium alloy blocks with a size of φ20mm×15mm, process the surface to be welded to be relatively flat, and put them into a pulse high-current heating device. First vacuumize the cavity of the device to 4Pa, and then pass high-purity Ar into the cavity for protection. The welding temperature is 700°C, the holding time is 5min, and the pressure is 5MPa. There is a certain thickness of diffusion transition layer at the interface of the obtained weldment, the tensile strength is greater than the strength value of the base metal, and the fracture occurs in the matrix.

Embodiment 2

[0018] Example 2: Take two Ti-6Al-4V titanium alloy blocks with a size of φ20mm×15mm, process the surface to be welded to be relatively flat, and put them into a pulse high-current heating device. First vacuumize the cavity of the device to 5Pa, and then pass high-purity Ar into the cavity for protection. The welding temperature is 650°C, the holding time is 10min, and the pressure is 5MPa. There is a diffusion transition layer with a certain thickness at the interface of the obtained welded part, and the tensile strength is above 900 MPa.

Embodiment 3

[0019] Example 3: Take two Ti-6Al-4V titanium alloy blocks with a size of φ20mm×15mm, process the surface to be welded to be relatively flat, and put them into a pulse high-current heating device. First vacuumize the cavity of the device to 6Pa, and then pass high-purity Ar into the cavity for protection. The welding temperature is 600°C, the holding time is 15min, and the pressure is 5MPa. There is a certain thickness of diffusion transition layer at the interface of the obtained weldment, the tensile strength is greater than the strength value of the base metal, and the fracture occurs in the matrix.

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Abstract

The invention relates to a kind of technology to heat and weld the Ti-6Al-4V titanium alloy with big impulse current. First make above alloy into as needing size, polish it then with water sand papers of different qualities. To rubdown its surface with metallographic sand paper in order to touch the two welding surfaces more tightly. Then heat the sample being welded with big impulse current in the heating device vacuum degree of which is 4~6Pa, and send high purity Ar into the device to protect. Because the big impulse current heats the sample material into certain temperature, and maintain the temperature for a time, we can get Ti-6Ai-4v titanium of hi high mechanic property that has good quality jointing spot. The technology is simple and can cuts down the cost, saves the production time, improves production efficiency.

Description

technical field [0001] The invention relates to a welding process of Ti-6Al-4V titanium alloy and a pulse high-current heating method. Background technique [0002] Ti-6Al-4V is a typical α+β two-phase titanium alloy, which has light specific gravity, high specific strength at room temperature and high temperature, good corrosion resistance, high elastic modulus, strong oxidation resistance, high specific stiffness, good process plasticity, It is characterized by superplasticity, thermal stability and good heat processing technology, and is suitable for various pressure processing and various welding and mechanical processing. The comprehensive mechanical properties are good and can be strengthened by heat treatment. It has good machinability and pressure processing performance, high strength at room temperature, and good heat resistance in the range of 150°C to 500°C. It can be used for jet engine press blades and turbine discs used below 450°C, l...

Claims

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Application Information

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IPC IPC(8): B23K13/00B23K13/06
Inventor 傅正义何代华王为民王玉成张金咏张清杰
Owner WUHAN UNIV OF TECH
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