Laser-rotating arc hybrid welding system and its hybrid welding method

Abstract

The invention provides a laser-rotating arc composite welding system and a composite welding method thereof. The welding system comprises a laser welding part and an electric arc welding part, whereinthe laser welding part is used for generating laser beams; the electric arc welding part is used for generating electric arc; the electric arc welding part comprises a TIG rotating arc welding gun which can realize rotation of the electric arc; the TIG rotating arc welding gun comprises a cylindrical housing, a gear ring, a driving gear and a driven gear, wherein the gear ring is positioned at the inner wall of the cylindrical housing; the driving gear is arranged inside the cylindrical housing and is driven to rotate by an electromotor; the driven gear is matched with the driving gear and the gear ring; a tungsten electrode of the TIG rotating arc welding gun is connected with the center of the driven gear; when the driving gear is driven to rotate by the electromotor, the driven gear rotates around the driving gear to drive the tungsten electrode to rotate around the driving gear so as to form rotating arc; and control ends of the laser welding part, the electric arc welding part and the electromotor all are connected with an integrated control center. The welding system and the welding method reduce the requirements on assembling clearance and can realize welding of high-reflectivity materials.

Description

technical field [0001] The invention relates to a laser-rotating arc compound welding system and a compound welding method thereof, belonging to the field of welding technology. Background technique [0002] The diameter of the laser welding beam is very thin, the requirements for the assembly clearance of the workpiece are very strict, and the tracking accuracy is very high, and the thermal efficiency is low when the molten pool has not been formed, because defects such as pores and undercuts are prone to occur during welding. In order to eliminate or reduce the above-mentioned defects of laser welding, on the basis of maintaining the advantages of laser processing, a laser-arc hybrid welding technology is proposed. The main idea of ​​laser and arc composite heat source welding is to effectively use arc energy to obtain greater welding penetration at lower laser power. This method combines the advantages of laser and arc, that is, the high energy density of laser and the l...

AI Technical Summary

Problems solved by technology

[0003] However, the ordinary laser arc hybrid welding is limited by the space position, and has high requirements for workpiece assembly, the allowable assembly gap is small, the tracking accuracy is high, the efficiency of the weld seam with complex shapes is low, and it cannot meet high-quality and high-precision welding. Process requirements

When welding narrow gap welds, it is easy to form sidewall unfused defects

Moreover, although laser-arc hybrid welding has the advantage of improving the structure and performance of the weld compared to laser welding technology, during the welding process, when the filler material enters the molten pool, due to the convection and stirring of the molten pool, the narrow and deep laser -The distribution of alloy elements in the arc weld still has a large inhomogeneity, which causes the difference in the structure of different parts of the weld, which in turn affects the mechanical properties of the welded part, and there are certain quality hidden dangers in use

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