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

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...

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 welding also has the following limitations: (1) The weldment must rely on rotation for friction, and it is difficult to weld non-circular cross-section workpieces, and it is difficult to weld disc-shaped and thin-walled pipes because it is difficult to clamp; (2) due to the power of the spindle motor And pressure limit, the maximum end face that can be welded is 200cm 2 ; (3) The one-time investment of the welding machine is relatively large, and only when the production batch is large enough can the goal of low cost be achieved

(2) Long welding time and low productivity

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