Vacuum welding method for titanium alloy and stainless steel

Abstract

The invention relates to a vacuum welding method for titanium alloy and stainless steel, wherein a fusion welding material is pure silver or a silver alloy; the welding method finishes operation in an enclosed cavity in an argon arc welding way and comprises the following specific welding steps of: (1) cleaning operation for removing an oxide film on the surface of a work-piece and for improving the wettability of the welding material; (2) combing and fixing the work-piece to be welded, placing the combined and fixed work-piece into the enclosed cavity, vacuumizing the enclosed cavity and opening an argon gas valve when an absolute pressure value in the cavity is lower than 500 Pa so as to fill the cavity with argon gas; and (3) heating and melting the silver alloy in the argon arc welding way, allowing silver alloy melt to flow into a gap between the stainless steel and the titanium alloy and cooling the silver alloy to finish a welding technique for the stainless steel and the titanium alloy. The welding method of the invention can reduce device cost and shorten welding flow. Argon gas protection can prevent a welding interface from being oxidized, increase depth of penetration for a welding bead and effectively improve bonding strength between the titanium alloy and the stainless steel.

Description

technical field [0001] The invention relates to a metal welding method, in particular to a vacuum welding method between titanium alloy and stainless steel. Background technique [0002] Titanium alloy is a metal widely used in aerospace, medical and health, sports and leisure, etc. It has high strength, low density, good mechanical properties, toughness and corrosion resistance, but in actual use, when it is used It is often more difficult to combine other metals on some special components. For example: Titanium and stainless steel are dissimilar metal materials, and the properties of the two are too different. The general welding method cannot achieve the alloying bonding effect, and it is easy to form a false welding phenomenon without bonding strength at all. Therefore, the general method of combining titanium alloy and stainless steel is to use screw locking, gluing, riveting and so on. However, the above-mentioned mechanical bonding method will cause a gap between th...

AI Technical Summary

Problems solved by technology

However, the above-mentioned mechanical bonding method will cause a gap between the two metals, and the energy is mostly transmitted through screws or rivets, resulting in uneven distribution of energy transmission; and gluing has temperature resistance problems, and usually embrittlement or softening occurs when the temperature exceeds 180°C

Therefore, the above binding method will affect the binding strength

[0003] Combining titanium alloy and stainless steel by silver-based vacuum brazing can effectively avoid the above problems, but the use of silver-based brazing has defects such as expensive equipment, time-consuming, energy-consuming, and complicated operations.

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