Double-beam laser welding method for medium plate

Abstract

The invention discloses a double-beam laser welding method for a medium plate. The double-beam laser welding method comprises the steps that 1, a plate welding bead and the positions, within the range of 20 mm, of the two sides of a plate are polished for slag removal; 2, the plate subjected to polishing and slag removal is fixedly clamped on a welding platform; 3, laser welding process parameters of a main light beam and an auxiliary light beam are set, the laser power of the main light beam is larger than or equal to the laser power of the auxiliary light beam, the laser power of the main light beam is larger than or equal to 3 KW, the laser power of the auxiliary light beam is larger than or equal to 2 kW, the welding speed is 0.2-1 m / min, the wire feeding speed is 1-8 m / min, and the defocusing amount is 10-30 mm; 4, a light spot of the auxiliary light beam is focused at the root part of one side of a welding seam plate; 5, the light spot of the main light beam is focused at the center of a welding seam; and 6, the main light beam and the auxiliary light beam move in the same direction to achieve welding. The welding seam gap stability control difficulty can be effectively reduced; the universality is high, the welding seam form can be a butt joint form or a corner joint form, and the welding mode can be filler wire welding or filling-free welding; and the swinging direction of a laser beam is controllable and adjustable.

Description

technical field [0001] The invention relates to a double-beam laser welding method for medium and thick plates, belonging to the technical field of laser welding. Background technique [0002] At present, when the excavator structural parts are usually assembled with medium-thick plates (thickness ≥ 4.5mm), there are problems such as difficult control of the weld gap of the plates, and difficulty in ensuring the alignment of the edges of the plates and the flatness of the end faces. In the field of laser welding, the single laser welding technology has higher requirements on the stability control of the plate welding seam joint gap stability. This is because the energy density of single laser welding is high and the distribution is concentrated. Under the condition of a certain single laser welding energy, if the joint gap is too large or too small, the weld is prone to welding defects such as collapse, weld leakage, and unfused root. The high defect rate will increase the ...

AI Technical Summary

Problems solved by technology

This is because the energy density of single laser welding is high and the distribution is concentrated. Under the condition of a certain single laser welding energy, if the joint gap is too large or too small, the weld is prone to welding defects such as collapse, weld leakage, and unfused root. The defect rate is high, which increases the cost of gouging and rework, and does not meet the requirements of lean production

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