Method for pulsed argon arc welding of titanium alloy and pure aluminum

Abstract

The invention discloses a method for pulsed argon arc welding of a titanium alloy and pure aluminum. The method comprises the following steps of: polishing a silicon-aluminum alloy filling welding wire by using a piece of fine sand paper before welding; and before the pulsed argon arc welding, polishing a chamfer angle at a joint on one side of the titanium alloy, scraping a joint on one side of the pure aluminum, and butting flat plates of the titanium alloy and the pure aluminum. The welding parameters of the pulsed argon arc welding are that: the background current is 40 to 60 A, the pulse current is 38 to 80 A, the pulse duration is 5 to 10 s, the pulse frequency is 35 to 65 Hz, the welding voltage is 8 to 16 V, the argon flow is 6 to 18 L / min, the distance between a welding gun nozzle and a workpiece is 8 to 12 mm, and the included angle between a welding gun tungsten electrode and the workpiece is 70 to 85 degrees. The welding gun is cooled after welding, and the cooling mode is preferred to be water cooling mode. According to the method for pulsed argon arc welding of the titanium alloy and the pure aluminum, the arc stability is obviously improved, the tensile strength of a welding joint is not lower than the tensile strength of a pure aluminum parent metal, and the operating requirements on titanium alloy and aluminum welding components in production can be met.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a welding method of dissimilar nonferrous metals, in particular to a pulsed argon arc welding method of titanium alloy and pure aluminum. Background technique [0002] Using a single material in modern engineering often cannot meet various requirements in practical applications. From the perspective of energy saving and emission reduction, the use of materials with different properties under different working conditions can meet the performance advantages of different materials, and dissimilar light metal welded structures have attracted more and more attention. Aluminum has the characteristics of high specific strength, low density, good corrosion resistance, good thermal conductivity and electrical conductivity, and is the main lightweight structural material. Titanium alloy has the characteristics of small linear expansion coefficient and elastic modulus, excellent corrosion r...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the existing diffusion welding technology is difficult to realize the connection of titanium and aluminum dissimilar metals under arc welding conditions, the invention provides a pulsed argon arc welding method of titanium alloy and pure aluminum dissimilar light metal alloy, which has the ability to obtain crack-free , Welded joints without brittle phases, which can meet the requirements for the use of titanium alloys and pure aluminum special-shaped structures in production, etc.