A thick-walled pipe narrow groove automatic bottoming welding process and welding head

Abstract

The invention discloses an automatic thick-wall pipe narrow groove bottoming welding technology method and a machine head device. Starting from a thick-wall pipeline, the selected wall thickness studyrange is 20-60 mm, a double-V groove and a U-shaped groove serve as key targets, and the narrow groove form and size are fitted for the thick-wall pipe fitting groove standard on the basis of different standards; and meanwhile, according to the narrow groove defining form, an automatic welding equipment thick-wall pipe narrow groove novel TIG welding machine head is designed. The designed invention of the TIG welding machine head mainly comprises two parts including a special wire guiding pipe clamping device and a lengthened flat ceramic nozzle, wire guiding smoothness and applicability to backing weld on the narrow groove through the welding machine head are guaranteed. The automatic thick-wall pipe narrow groove bottoming welding technology method and the machine head device can adaptto automatic bottoming welding of thick-wall pipes with the thickness ranging from 20 mm to 60 mm, the welding technology requirement is met, the welding line metal filling amount during thick-wall pipe welding is reduced, and the welding efficiency is improved; and the pipeline production cost is reduced, and the thick-wall pipe welding quality and efficiency are both improved.

Description

technical field [0001] The invention belongs to the technical field of automatic welding of pipelines, and in particular relates to a process method and a machine head device for automatic backing welding of narrow grooves of thick-walled pipes. 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 production costs. [0003] The argon arc welding (TIG) process is a high-quality welding technology with stable arc combustion, convenient operation and observation. It is often used in automatic bottom welding of pipelines, with high ...

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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 automatic bottoming welding process and head device, and solve the problems caused by the slope of the ordinary welding torch in the industry for automatic welding of pipelines. It is difficult to enter the bottom of the groove of thick-walled pipe due to the size limitation of the mouth and welding head, and it is impossible to realize automatic bottoming welding of narrow groove of thick-walled pipe, which affects the welding quality and efficiency, and reduces the amount of weld metal filling when welding thick-walled pipe , improve welding efficiency, reduce pipeline production costs, and realize double improvement of thick-walled pipe welding quality and efficiency

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