Two-pulse-laser-beam time sharing inducing MAG arc directional swing surfacing method

Abstract

The invention discloses a two-pulse-laser-beam time sharing inducing MAG arc directional swing surfacing method. The method comprises the steps that the positions, relative to the upper surface of a welded workpiece, of focuses of two pulse laser beams are adjusted, and thus, the diameter of laser spots acting on the welded workpiece is 2-6 mm; the interval D<LA1> between centers of projections, on the surface of the workpiece, of the laser spots of the two pulse laser beams is adjusted; the vertical interval D<LA2> from the point of intersection of the axis of a welding wire and the surface of the workpiece, to the line of centers of the projections, on the surface of the workpiece, of the laser spots of the two pulse laser beams is adjusted; the included angle between the incidence direction of the two laser beams and the normal direction of the surface of the workpiece is adjusted; the included angle between the axis of the welding wire and the workpiece is adjusted; and the laser peak power, base power, pulse width, frequency, laser wire interval and wire feeding speed of the two pulse laser beams are adjusted, so that a hybrid welding arc action point conducts directional swinging between the two pulse laser beams. The method can be applied to bath surfacing of small-size hollow workpieces and large-size thin-walled workpieces, and after welding is completed, the thicknessof a surfacing layer on the surface is smaller than 2 mm.

Description

technical field [0001] The invention relates to batch surfacing welding of small hollow and large thin-walled workpieces, in particular to a method for time-sharing induction of MAG (Metal Active Gas Arc Welding, metal active gas arc welding) arc directional swing surfacing welding by double-beam pulsed lasers . Background technique [0002] At present, the commonly used surface surfacing methods include submerged arc welding, open arc welding, TIG (Tungsten Inert Gas Welding, non-melting inert gas shielded arc welding) welding and laser cladding. Submerged arc surfacing welding has high deposition efficiency and low surfacing welding cost, but it has large heat input and large deformation after welding, so it is often used for surfacing welding of large workpieces; open arc surfacing welding equipment, simple process, easy operation, high deposition efficiency, and welding The back deformation is small, and it is often used for the surfacing of workpieces with a surfacing ...

AI Technical Summary

Problems solved by technology

The surfacing welding method successfully introduces the pulse laser into the MAG arc surfacing welding, induces the MAG arc through the pulse laser time-sharing, promotes the directional swing of the MAG arc, changes the welding heat transfer mode, the shape of the molten pool and the force of the droplet, and solves the traditional Surfacing and high-energy beam surfacing cannot realize the problem of mass surfacing of small hollow and large thin-walled workpieces such as rolls, continuous casting rolls, and water walls that require a surfacing layer thickness of 1-2 mm.

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