Welding forming method of highly corrosion-resistant stainless steel composite tube

Abstract

The invention provides a welding forming method of a highly corrosion-resistant stainless steel composite tube. The method comprises the following steps: (1) cutting a stainless steel composite plate into panels in required sizes; (2) symmetrically processing long sides of the panels of the stainless steel composite tubes into X-shaped grooves; (3) bending the stainless steel composite tubes into stainless steel composite tubes, wherein the outer diameter is a required diameter; (4) performing preweld cleaning; (5) performing electric-arc welding on a cladding metal by using a welding rod, wherein the welding rod is a stainless steel welding rod; (6) performing electric-arc welding on a base metal by using a welding rod, wherein the welding rod is a stainless steel welding rod or a carbon steel welding rod; and (7) grinding and straightening the welded stainless steel composite tubes. According to the method provided by the invention, various welding steps such as sealing, transition welding and overlay welding are reduced, the welding efficiency is extremely improved and the production cost is extremely lowered. Furthermore, the method is relatively simple, and a relatively strong metallurgical bonding interface prevents occurrence of delamination cracks.

Description

technical field [0001] The invention relates to a welding and pipe-making technology of a stainless steel composite plate, which belongs to the field of welding technology. Background technique [0002] Nowadays, with the development of high-sulfur coal, oil and gas resources, and the promotion of oil and gas high-pressure transmission technology, the corrosion of carbon steel pipelines has attracted more and more attention, and the demand for high-strength and high-corrosion-resistant pipes is more urgent. A variety of solutions have been developed to prevent the corrosion of fluids on pipelines, such as adding corrosion inhibitors to fluids, coating, plating, infiltrating, and lining corrosion-resistant layers in pipelines, and using corrosion-resistant alloys or stainless steel pipes. However, high prices and environmental pollution are the main obstacles hindering pipeline improvement and replacement. [0003] The stainless steel composite pipe gives full play to the hi...

AI Technical Summary

Problems solved by technology

However, at present, most stainless steel composite pipes are lined with seamless stainless steel composite pipes, which are prepared by metal pipe deflagration lining technology, that is, carbon steel pipes and stainless steel pipes are used as blanks, assembled into double-layer pipes according to a certain gap, and then deflagration and lining are used. Lining technology, such as explosive welding, thermal expansion welding, thermal diffusion welding or thermal deformation method, produces stainless steel composite pipes. The interfacial bonding obtained by this method is only mechanical bonding or semi-metallurgical bonding. Weak interface state, low bonding degree and bonding strength, prone to delamination, which will easily cause delamination cracks in the subsequent straightening, assembly, cutting and processing, welding and service processes, which greatly affects the Structural bearing capacity and corrosion resistance

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