Butt-joint pipe fitting laser welding device and welding method

Abstract

The invention belongs to the technical field of welding, and discloses a butt-joint pipe fitting laser welding device which comprises a laser welder and a rotary mechanism, wherein butt-joint pipe fittings are respectively mounted on the rotary mechanism; butt-joint surfaces of the butt-joint pipe fittings are fitted; the laser welder is fixedly arranged at one side of the butt-joint surfaces of the butt-joint pipe fittings; the rotary mechanism drives the butt-joint pipe fittings to coaxially rotate at the same rotation speed; and the laser welder carries out laser welding on the butt-joint surfaces of the butt-joint pipe fittings. The invention further discloses a welding method for the device. According to the butt-joint pipe fitting laser welding device and the welding method, welding efficiency and quality for medium-thick pipes are improved, the welding automation degree is improved; and the butt-joint pipe fitting laser welding device and the welding method are suitable for butt-joint welding of other pipe fittings with various wall thicknesses.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a laser welding device and a welding method for butt joint pipe fittings. Background technique [0002] In the third-generation nuclear power technology, the support column assembly of reactor internals is a difficult problem that needs to be overcome urgently in welding and manufacturing. This type of product provides support for the channel of the control rod guide tube under the conditions of high temperature, high pressure and corrosion. The reliability of its structure and the accuracy of its size are important factors for the safety of nuclear reactors. [0003] The support column assembly is a medium-thick tube with a pipe wall greater than 12mm. The existing welding method is to fix the butt pipe fittings of the support column with grooves processed, and then use manual or automatic non-melting electrode gas shielded welding while the support column rotates ( TIG) weldi...

AI Technical Summary

Problems solved by technology

[0004] The welding method of traditional arc welding has low efficiency due to the need for multi-pass welding, and the welding shrinkage deformation is large, and the axial deformation is uneven, resulting in poor coaxiality after welding.

However, if the fiber laser welding method with fixed pipe fittings is used, it is not suitable for welding medium-thick pipes because it is difficult for the robot to perform circular motion and the laser beam needs to change the angle continuously.

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