Welding method and system

Abstract

The invention relates to the technical field of welding, and provides a welding method and system.The method comprises the steps that a pre-welding part of a workpiece to be welded is machined to form a groove, and the groove is polished and cleaned; carrying out CMT welding on the groove to form a base coat covering the groove; and performing weld bead filling welding on the base layer by adopting laser-arc hybrid welding. According to the welding method and system, backing welding is conducted through the CMT welding technology, the backing weld bead with the excellent back face forming performance is obtained, then the efficient laser-arc hybrid welding technology is adopted for welding of the filling weld bead, the problem that the back face of the backing weld bead is poor in forming performance is solved, and the welding quality is improved. And meanwhile, the defects of overhigh weld reinforcement on the back of the weld joint, weld beading, burnthrough, slag inclusion, air holes and poor fusion of two sides of a groove are overcome, and the service life of the product is prolonged.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method and system. Background technique [0002] With the continuous development of the mechanical engineering manufacturing industry, the welding engineering structure is becoming larger and more complex, and the requirements for welding quality are also increasing. At present, in the machinery manufacturing industry, the MAG welding process is mostly used for welding thick plates. It has relatively stable welding process performance and high-quality welded joints, and can be used for welding in various positions in space, especially for carbon steel and alloys. For the welding of steel and stainless steel, in order to improve the welding efficiency, high current and high speed welding are generally used. [0003] When using the MAG welding process to weld the thickness, in order to improve the welding efficiency, high-current and high-speed welding is generally used...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a welding method and system to solve the problem of poor formation of the back of the weld bead. By adopting CMT welding technology for back welding, a back welding bead with excellent back forming is obtained, and then high-efficiency laser arc hybrid welding is adopted. Weld the filler bead with advanced technology to avoid the poor formation of the back of the bottom bead. At the same time, it can avoid the defects of excessive reinforcement on the back of the weld, welding bumps, burn-through, slag inclusions, pores and poor fusion on both sides of the groove, and improve the product quality. service life

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