Laser-double side arc compound welding method for thick plate

Abstract

The invention provides a laser-double side arc compound welding method for a thick plate, and solves the problems of welding line root defect, low laser energy utilization rate, complicated operation, time consumption, high equipment cost and the like during thick plate welding of the existing welding method. The laser-double side arc compound welding method comprises the following steps: 1, processing a groove in a part to be welded according to the form of a welding joint; 2, fixing a workpiece, and cleaning the groove; 3, arranging a laser bundle and a first welding gun on one side of the joint, wherein a first included angle of 30-45 degrees is formed between the optical axis of the laser bundle and the middle axial line of the first welding gun, and a preset gap is formed between the incidence point of the laser bundle and the tail end of a welding wire of the welding gun; arranging a second welding gun on the other side of the joint in a mirror image manner; 4, forming a double-side penetrating melting pond at the joint in a welding process by energy matching, wherein an electric arc plasma generated by the first welding gun is in contact with a laser-induced plasma generated by the laser bundle, thus diluting the laser-induced plasma.

Description

technical field [0001] The invention relates to the technical field of laser processing, in particular to a laser-arc hybrid welding method for large thick plates. Background technique [0002] In the field of welding, the plate with a thickness less than 4mm is generally called a thin plate, the plate with a thickness between 4mm and 12mm is called a medium plate, and the plate with a thickness greater than 12mm is called a thick plate. [0003] Laser-arc hybrid welding combines the advantages of laser welding and arc welding. It has the characteristics of large penetration depth, high welding speed, wide gap adaptability and small welding deformation. It shows unique advantages in medium and thick plate welding. [0004] Currently known laser-arc hybrid welding methods are: [0005] 1. Conventional laser-arc hybrid welding method [0006] Laser-arc composite processing methods such as figure 1 As shown, for the butt joint, the method is a laser heat source 1 and an arc ...

AI Technical Summary

Problems solved by technology

[0016] The object of the present invention is to provide a thick plate laser-double-sided arc hybrid welding method. When the existing laser-arc hybrid welding method welds a thick plate, there are cracks at the root of the weld, pore defects, large welding stress and deformation, and laser energy. Low utilization rate, complex and time-consuming operation, high equipment cost, etc.

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