Large straight-line joint submerged arc welding tube fast production process

Abstract

The invention provides a big vertical masonry joint hidden arc welding tube fast production method belonging to the processing and forming fields of metal plate and relating to the bending processing and forming technology of metal plate which is mainly used for the fast production of the big vertical masonry joint hidden arc welding tube. The invention adopts continuous array rollers of a coil stock to form, high frequency prewelding on line, then utilizing a off-line automatic submerged arc welding to carry out the inner welding and outer welding of the welded pipe as well as expanding, water pressure and nondestructive examinations; thereby realizing the high efficiency production of the big vertical masonry joint hidden arc welding tube products. The invention adopts a plate-coiling mode to supply materials, cutting materials, shearing and butt welding, utilizes milling edge to finish the online-processing of a divided edge beside the plate, primary roller forming, fine roller forming, high frequency prewelding after a rough material is continuously formed by the array rollers and sawing as well as baiting and the steel tube rough material needed by a hidden arc welding working procedure can be acquired through online dimension fixing and cutting off; hidden arc inner welding and hidden arc outer welding, inner control examination, expending, water pressure test, repairing ends by machinery are carried out on the steel rough material to exam to acquire a finished product. The technique has a reasonable design and has the advantages of good steel tube forming quality and high production efficiency as adopting the array rollers to form and high frequency prewelding; thereby ensuring the overall production efficiency of the technique and the welding line quality can also be ensured reliably.

Description

technical field [0001] The rapid production method of large longitudinal submerged arc welded pipes of the present invention belongs to the field of metal plate processing, relates to metal plate bending and pipe welding processing technology, and is mainly used for the rapid production of large longitudinal submerged arc welded pipes. Background technique [0002] Longitudinal welded pipes include two products: large-diameter longitudinal submerged arc welded pipes and high-frequency longitudinal welded pipes. The production of the two products corresponds to different tube blank forming processes and tube blank welding processes, and there are large differences in production efficiency and weld quality. , In engineering construction, the above two types of products can be customized according to different technical requirements. Therefore, the above two types of products each have their specific market needs. [0003] The production process of large longitudinal submerged...

AI Technical Summary

Problems solved by technology

At present, the production of high-frequency straight seam pipes mainly adopts ERW production units, but this process is limited to the production of a single product of high-frequency welded steel pipes, and currently does not have the production capacity for large-diameter straight seam arc welded pipes

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