Large thick plate narrow gap vibration laser arc welding method and welding device thereof

Abstract

The invention discloses a large thick plate narrow gap vibration laser arc welding method and a welding device thereof. The composite welding method comprises the steps that laser beam generated laserwelding equipment and arc generated by arc welding equipment jointly act on a welding pool for welding under the protection of shielding gas, the laser beam generated by the laser welding equipment is vibration laser beam, and a narrow gap arc welding torch is used as a welding gun of the arc welding equipment; and in the laser-arc composite welding process, the vibration laser beam and the arc are composited in a large thick plate narrow gap groove, through the attraction function of the laser on the arc, and the arc is guided by the vibration laser beam to oscillate in the narrow gap groove, so that the two heat sources of the vibration laser beam and the arc simultaneously act on the same welding pool for welding. The method adopts the mode of coupling the vibration laser beam and thearc, and vibration laser-arc composite welding in the large thick plate narrow gap groove is achieved.

Description

technical field [0001] The invention relates to a vibration laser-arc compound welding method and a welding device for a narrow gap of a large thick plate, belonging to the technical field of laser processing and welding. Background technique [0002] Large thick plates are often used in the welding and manufacturing of large thick-walled structures such as ships, nuclear power plants, and pressure vessels, such as stainless steel ITER giant vacuum chamber thick plate structures with a plate thickness of 60mm, aluminum alloy military phased array radar substrates with a thickness greater than 70mm , 316LN stainless steel main circuit pipelines with a wall thickness greater than 30mm in the nuclear power field, and oil and natural gas transportation pipelines with a wall thickness greater than 15mm. At present, the widely used welding methods are gas-electric vertical welding and submerged arc welding, etc., but these methods have disadvantages such as excessive heat input, c...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of existing narrow-gap laser-arc hybrid welding, and to realize vibration laser-arc hybrid welding in narrow-gap grooves of large and thick plates by coupling the vibrating laser beam with the electric arc

Change the relative position of the laser and the arc during the hybrid welding process through the vibration of the laser, and guide the arc to swing in the narrow gap groove to solve the side wall fusion problem of the weld and improve the welding quality of the joint

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