Titanium alloy composite welding process based on small hole TIG and activated TIG, and active agent

Abstract

The invention relates to a titanium alloy composite welding process based on small hole TIG and activated TIG, and an active agent. The active agent belongs to fluoride components and comprises analytically pure calcium fluoride, sodium fluoride, aluminum fluoride and silver fluoride. According to the titanium alloy composite welding process based on the small hole TIG and the activated TIG, the developed active agent is used for coating or being sprayed to welding surfaces before welding, the arc stiffness can be increased in the welding process, the arc penetration can be improved, and the effects that the melting width is reduced, the volume of a welding seam and a heat affected zone is reduced and the welding deformation effect is reduced are achieved, and meanwhile, welding air holescan be inhibited to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of fusion welding, and in particular relates to a titanium alloy composite welding process based on small-hole TIG and activated TIG and an activator, which are applied to butt-type medium-thickness welds of thick-plate titanium alloys. Background technique [0002] Titanium alloy is widely used in marine engineering, shipbuilding, petrochemical, aerospace, pressure vessel manufacturing and nuclear power equipment and other industrial fields due to its high specific strength, high-quality corrosion resistance, and non-magnetic properties. The medium thickness is 5~ 15mm titanium alloy is the most widely used in engineering applications. The more advanced automatic welding methods for titanium alloys include electron beam welding (EB) and plasma arc welding (PAW), which are not only expensive in equipment, but also high in cost of use, and slow in engineering application and promotion. [0003] Titanium allo...

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Problems solved by technology

[0004] In order to solve the problem of large heat input of titanium alloy small-hole TIG, excessive weld seam and heat-affected zone, and cause large welding deformation, the invention provides a titanium alloy composite welding process and activator based on small-hole TIG and activated TIG , for the small hole TIG of titanium alloy, a special titanium alloy small hole TIG activator has been developed, which can be coated or sprayed on the welding surface before welding, which can increase the arc stiffness during the welding process, improve the arc penetration, and reduce the Melt width, reduce the volume of weld seam and heat-affected zone, reduce the effect of welding deformation, and at the same time, have a certain inhibitory effect on welding porosity