Production method of high-strength alloy welded pipe

Abstract

The invention discloses a production method of a high-strength alloy welded pipe. The production method comprises the following steps that an uncoiled strip is heated and then enters a pipe blank forming unit to be progressively formed into a pipe blank; a laser main welding arc auxiliary welding mode is adopted, so that the pipe blank entering the welding chamber is welded and formed into a welded pipe; the diameter of the welded pipe is preset, and then online annealing heat treatment is conducted to obtain a low-stress welded pipe; and carrying out secondary sizing, straightening and detection treatment on the low-stress welded pipe. According to the production method, a heat-assisted titanium alloy incremental forming pipe blank technology is designed, the strength of the high-strength titanium alloy is reduced by heating the strip, the plasticity and deformation capacity of the high-strength titanium alloy are improved, meanwhile, a laser main welding arc auxiliary welding mode is adopted, the area and the grain size of a titanium alloy welding seam melting area can be remarkably reduced, and the welding quality is improved. The low-stress laser welding and on-line heat treatment processes are utilized, the stress of the welded pipe can be effectively reduced, comprehensive regulation and control of forming, tissue, stress and performance are achieved, and finally the high-quality high-strength titanium alloy welded pipe is obtained.

Description

technical field [0001] The invention relates to the field of production of high-strength alloy welded pipes, in particular to a production method of high-strength alloy welded pipes. Background technique [0002] The frame strength of the current pure titanium, low-strength titanium alloy, stainless steel and other welded pipe production lines is about 600MPa, which is difficult to adapt to the production of high-strength titanium alloys (tensile strength greater than 1000MPa) with a thickness of 3-5mm, resulting in serious frame wear , unstable welded pipe forming, and unreliable quality of welded pipes. Due to its high strength and pressure resistance, high-strength titanium alloy welded pipes have a wide range of needs in aerospace equipment oil circuit systems, weaponry and other fields. Therefore, how to optimize and transform It is of great significance to adapt the existing production line equipment to the production of high-strength titanium alloy welded pipe. Cont...

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Problems solved by technology

[0003] The invention provides a production method of high-strength alloy welded pipes to solve the problems of "severe frame wear, unstable welded pipe forming, and poor quality of welded pipes" existing in the production of high-strength titanium alloys by using existing pure titanium, low-strength titanium alloy or stainless steel welded pipe production lines. Reliable" and other technical issues

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