Method and device for pulse composite magnetic field assisted GMAW high-speed welding

Abstract

The invention discloses a method and a device for pulse composite magnetic field assisted GMAW high-speed welding. The device comprises a direct-current pulse adjustable excitation power supply and apulse composite magnetic field generation device, and the direct-current pulse adjustable excitation power supply is connected with the pulse composite magnetic field generation device; the pulse composite magnetic field generation device comprises a GMAW welding gun and magnetizing iron cores arranged on the outer edge of the GMAW welding gun; and the magnetizing iron cores comprise a plurality of magnetic poles, magnetic pole heads are arranged along the circumference of the GMAW welding gun, an included angle is formed between the upper portion of each magnetizing iron core and the center line of the GMAW welding gun, and excitation coils are wound around the upper portions of the magnetizing iron cores. By controlling the inclination angle in the welding direction, the amplitude and frequency of left and right swing and residence time on two sides of a weld joint of droplet metal and a welding arc, transverse spreading and backward flowing of liquid metal in a molten pool can be improved, and under certain welding parameters and magnetic field parameters, the purposes of eliminating the defeats namely, undercut and the humping defect can be achieved.

Description

Technical field [0001] The invention relates to a pulse compound magnetic field assisted GMAW high-speed welding method and device. Background technique [0002] Welding process has a significant impact on the final quality and production efficiency of equipment manufacturing products. At present, MMAW (GMAW) plays a leading role in the application of various welding technologies. Increasing its welding speed is the main way to improve welding productivity. However, actual production experience has proved that when the GMAW welding speed reaches 0.6m / min, undercut defects appear in the weld; when the welding speed is further increased, hump defects will also be induced. The appearance of undercut and hump defects severely reduces the mechanical properties of the joint, limits the increase in welding speed, and becomes a bottleneck for enterprises to improve welding productivity. [0003] The use of an external magnetic field to improve the arc welding process has the advantages ...

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Problems solved by technology

However, a suitable external magnetic field device has not yet been developed to simultaneously realize the targeted regulation of the lateral spreading and backward flow of liquid metal in the molten pool.

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