Welding process of titanium alloy graphite backing

Abstract

The invention discloses a welding process of a titanium alloy graphite backing. The welding process comprises a step 1 of designing and fabricating a graphite welding backing fixture according to a titanium alloy welded structure, a step 2 of performing drying and degassing treatments on the graphite welding backing fixture, a step 3 of assembling the graphite welding backing fixture in an inner cavity of titanium alloy welded structure part, a step 4 of carrying out welding, and a step 5 of crushing the graphite welding backing fixture after welding and taking out graphite fragments, and then finishing the welding process of the titanium alloy graphite backing. The welding process of the titanium alloy graphite backing is applicable to the welding of one side welding forced back shaping of complex and special-shaped titanium alloy structures, and capable of improving a back shaping effect.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a titanium alloy graphite backing welding process method. Background technique [0002] There are two forming methods for single-side welding and double-side forming of titanium alloy: free forming and forced forming. Free forming means that no supporting material is added to the back of the weld, and the back weld is formed only by the surface tension of the molten metal to prevent the molten pool from leaking down. Free forming requires a reasonable gap between workpieces. If the gap is too small, it is difficult to ensure penetration. If the gap is too large, defects such as burn-through will easily occur. This is especially prominent for titanium alloy welding. Titanium alloy welding requires a slightly larger gap, but molten titanium The alloy has good fluidity, and it is easy to burn through or have a large weld leakage. In addition, the welding pro...

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Problems solved by technology

[0004] 1. Complex structure and high cost;

[0005] 2. It is difficult to realize complex and special-shaped structures;

[0006] 3. For thick-walled titanium alloy welding structures, in order to ensure penetration, it is necessary to reserve a welding assembly gap. In this case, welding pads made of copper or other metal materials cannot be used;

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