Thick-wall pipe narrow slope SAW automatic welding process and welding machine head

Abstract

The invention discloses a thick-wall pipe narrow slope SAW automatic welding process and a welding machine head. The process comprises the following steps: the process is started with thick-wall pipes; the wall thickness research range is selected within 22-60 mm; emphasis aiming at double V grooves and U-shaped grooves, forms and sizes of narrow grooves are set according to the groove specifications of the thick-wall pipes based on different standards (such as ASME, national standard or European standard); meanwhile, according to the defined forms of the narrow grooves, a thick-wall pipe narrow groove novel SAW welding machine head of automatic welding equipment is designed; a novel SAW welding gun mainly comprises two parts of a welding wire guide mechanism and an unloading device; the wire guide smoothness and the unloading smoothness are guaranteed; and the effect of fluxes protecting welding lines is excellent. The thick-wall pipe narrow slope SAW automatic welding process solvesthe problems of limitation of the thick-wall pipes by the sizes of grooves and welding machine heads on industry and influence on the welding quality and efficiency, reduces the welding line metal filling quantity in welding of the thick-wall pipes, improves the welding efficiency, reduces the pipe production cost, and realizes dual improvement of the welding quality and efficiency of the thick-wall pipes.

Description

technical field [0001] The invention belongs to the technical field of automatic welding of pipelines, and particularly designs a SAW automatic welding process method and head device of thick-walled pipes with narrow grooves. Background technique [0002] In industries such as petroleum, thermal power plants, nuclear power plants, and power generation equipment manufacturing, there are a large number of welding of thick-walled pipes and related components, and there are many specifications. TIG, SAW, MIG / MAG and manual welding are routinely used for welding. However, the traditional welding method has a large groove angle and a large amount of metal filling, resulting in a certain waste of consumables and expensive pipeline manufacturing costs. [0003] The submerged arc welding (SAW) process method is an efficient welding technology, which is often used in the automatic welding of pipelines, with high efficiency and good quality. However, limited by the size of ordinary we...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art, provide a thick-walled pipe narrow groove SAW automatic welding process method and head device, and solve the problem that thick-walled pipes are limited by the size of the groove and welding head in the industry. , problems that affect welding quality and efficiency, reduce the amount of weld metal filling when welding thick-walled pipes, improve welding efficiency, reduce pipeline manufacturing costs, and achieve double-improvement of thick-walled pipe welding quality and efficiency

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