Wire filling tungsten electrode argon-arc welding process for TA15 titanium alloy and austenitic stainless steel

Abstract

The invention discloses a dissimilar material connection process for TA15 titanium alloy and austenitic stainless steel, which comprises the following steps of: before welding, polishing surfaces to be connected of the TA15 titanium alloy and the austenitic stainless steel which are flattened by abrasive paper so as to ensure the roughnesses of the surfaces to be welded to reach Ra1.6 to 3.2; cleanly polishing the surfaces of pure copper welding wires by the abrasive paper; horizontally abutting and placing the TA15 titanium alloy and an austenitic stainless steel sheet which have equivalent size specifications and forming a single-sided V-shaped groove with an angle of 30 degrees to 45 degrees at one side of the TA15 titanium alloy, wherein an assembling gap is 0.05mm to 0.15mm and the specification of a truncated edge is 1 to 2mm; adding the pure copper welding wires between the TA15 titanium alloy and an austenitic stainless steel connecting piece, carrying out weld preheating on the TA15 titanium alloy and an austenitic stainless steel weldment by adopting oxy-acetylene flame, controlling the heat distribution to carry out wire filling tungsten electrode argon-arc welding and protecting a welding region by adopting pure argon, wherein the welding process has parameters of a welding voltage of 12 to 15V, a welding current of 80 to 100A, a welding speed of 100 to 130mm / min and an argon flow of 10 to 15L / min; and after welding, immediately covering the weldment with asbestos cloth to carry out heat preservation and moving the asbestos cloth until the temperature is cooled to below 50 DEG C.

Description

technical field [0001] The invention belongs to the connection technology of dissimilar materials, and relates to the technical fields of materials, machinery, aerospace, chemical industry, etc., in particular to a wire-filled tungsten argon arc welding process of TA15 titanium alloy and austenitic stainless steel. Background technique [0002] At present, TA15 titanium alloy has been widely used in aerospace, chemical industry, power station and other fields due to its advantages of high specific strength, corrosion resistance and good weldability. TA15 titanium alloy can play an important role in reducing structural quality, improving structural efficiency, improving structural reliability, increasing the life of the body, and meeting the requirements of high temperature, high load and corrosive environments. [0003] It is difficult for a single TA15 titanium alloy to meet the different requirements of different parts of the product for performance. In some cases, dissim...

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Problems solved by technology

Although titanium and stainless steel can be brazed to obtain joints with certain performance, the service temperature of the joints is low, and the corrosion resistance often cannot meet the high requirements; diffusion bonding of titanium and stainless steel often uses a composite intermediate layer Cu-V or Cu- Mn-Ni can obtain high-strength joints, but the shape and size of the joints are greatly limited, and the process is complicated, and the precision is difficult to control; when laser welding and electron beam welding are used to connect titanium and stainless steel, the assembly accuracy of weldments Strict requirements and high equipment costs; although explosive welding is the most effective way to connect large-area composite panels, there are also problems such as large deformation, uneven structure and performance