Weld joint force applying device and method using same for improving form and performance of weld joint

Abstract

The invention discloses a weld joint force applying device and a method using the weld joint force applying device for improving the form and performance of a weld joint, and the weld joint force applying device is applied to the field of welded pipe machining. In the process of submerged-arc welding, a force applying block in the weld joint force applying device applies force on the weld joint which is still in a liquid state or semi-solid state stage, so that plastic deformation happens on the liquid state or semi-solid state weld joint according to the surface shape of the force applying block to generate a liquid forging effect, the interior of the weld joint after forging and pressing is even and compact, defects possibly existing in the weld joint are eliminated, impacting energy of a weld joint center and a heat effect area is improved, the form of the weld joint can be controlled, and weld joint polishing amount is reduced. The weld joint force applying device and the method well solve the problems that the weld joint form of a submerged-arc welded pipe is difficult to control, and critical defects may happen on the weld joint and can be widely applied to a submerged-arc welded pipe production line.

Description

technical field [0001] The invention is used in the field of welded pipe processing, and in particular relates to a welding seam force applying device and a method for improving the shape and performance of the welding seam by using the device. Background technique [0002] The two key processes of submerged arc welded pipe are forming and welding. The quality of submerged arc welded pipe has an important influence on the service performance and life of welded pipe. [0003] The welding process of submerged arc welding is affected by many factors, and sometimes it is inevitable to produce welding appearance defects and internal defects. The common appearance defects are that the surface of the weld seam is not smooth, the weld reinforcement is too high, and the weld width and width of the weld seam are different. , weld undercut, etc., and internal defects include slag inclusions, pores, cracks, etc., especially thick-walled submerged arc welded pipes. Users pay more attent...

AI Technical Summary

Problems solved by technology

Users pay more attention to the weld shape and weld performance of submerged arc welded pipes, especially for welded pipes that need anti-corrosion treatment, it often takes a lot of time and labor costs to grind and repair the weld seam of submerged arc welded pipes, and the grinding conditions are also very bad

[0004] At present, the common method is to adjust the welding process parameters. Adjusting the welding process parameters has a significant impact on the weld shape and performance, but it is often difficult to choose the appropriate welding process parameters. The welding current, welding voltage, welding speed and other process parameters and the weld shape The relationship between them is highly nonlinear, and it is difficult to obtain an ideal weld shape by adjusting the welding process parameters

[0005] For improving the performance of the weld and eliminating the possible defects, there is currently no method to eliminate the possible defects of the weld

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