Based on Lin Hui Titanium's many years of experience, argon arc welding is sufficient. Titanium has a low thermal conductivity, and the titanium alloy welding process is not difficult. It is very similar to austenitic stainless steel welding. However, titanium alloy is very easy to oxidize, so special protective measures must be taken during titanium alloy welding.
Generally, an argon gas protection hood is added behind the nozzle through modification. If there is a requirement for single-sided welding and double-sided forming, the back side must also be protected. The protection effect can also be confirmed by the surface color of the welding area.
If conditions permit, a pulsed power supply can be selected, which can more conveniently control the heat input.
Usually, post-weld treatment is required, stress-bearing firmware reinforcement or solid solution, and corrosion-resistant component surface treatment.
Is it necessary to heat treat titanium alloy after welding? How to perform heat treatment and what are the specific methods?
Generally, heat treatment is not required. Unless there are special requirements, it needs to be treated according to the different requirements of different materials.
The heat treatment process of titanium alloy can be summarized as follows:
(1) Stress relief annealing: The purpose is to eliminate or reduce the residual stress generated during the titanium alloy welding process. Prevent chemical erosion and reduce deformation in some corrosive environments.
(2) Full annealing: The purpose is to obtain good toughness, improve processing performance, facilitate reprocessing, and improve the stability of size and structure.
(3) Solution treatment and aging: The purpose is to improve its strength. α titanium alloy and stable β titanium alloy cannot be strengthened by heat treatment. Only annealing is performed in production. α+β titanium alloy and metastable β titanium alloy containing a small amount of α phase can be further strengthened by solution treatment and aging.
In addition to meeting the special requirements of the workpiece, titanium alloy welding also adopts metal heat treatment processes such as double annealing, isothermal annealing, β heat treatment, and deformation heat treatment in industry.
