Beam shaping method for laser-plasma arc coaxial hybrid welding

Abstract

Provided is a beam shaping method for laser-plasma arc coaxial hybrid welding. The method is based on the laser-plasma arc coaxial hybrid welding and can be applied to curve welding and three-dimensional welding. The diameter of an incident beam is determined, namely, the diameter D of a central round hole of a plane mirror and the inner cone diameter D0 of a conscope are determined; the inner conical angle gamma 1 and the outer conical angle gamma 2 of the conscope are determined; the distance between the plane mirror and the conscope is calculated; the largest inner ring diameter D1 and the largest outer ring diameter D2, which can be obtained through the conscope, of an annular beam are determined; the largest diameter D3 of the conscope is determined in the outer conical direction; it is determined that light, which is r far from a beam center, emitted from the inner round hole of the plane mirror enters the conscope and comes out to form an annular beam, wherein r is not smaller than 0 but not larger than D / 2; the width h of a circular ring is determined. By means of the method, the size of the device used in a prior shaping method is reduced, and the method has important significance to application of laser-plasma arc coaxial hybrid welding.

Description

technical field [0001] The invention relates to the field of laser welding, in particular to a beam shaping method for laser-plasma arc coaxial composite welding. Background technique [0002] In the process of laser-plasma arc hybrid welding, paraxial hybrid welding is mostly used. Typical paraxial hybrid welding is mainly composed of laser beam 1, plasma arc 2 and workpiece 3, such as figure 1 . Laser-plasma arc hybrid welding is studied by changing the hybrid welding parameters. Its biggest disadvantage is the asymmetry of the heat source, the welding quality is greatly affected by the welding direction, and it is difficult to use for curve or three-dimensional welding. [0003] Laser-plasma arc coaxial hybrid welding can make the laser beam and plasma arc concentrically distributed, so as to obtain a definite heat distribution, which can improve arc stability, improve melting efficiency, reduce cooling rate and improve residual stress state, and improve weld shape. I...

AI Technical Summary

Problems solved by technology

Its biggest disadvantage is the asymmetry of the heat source, the welding quality is greatly affected by the welding direction, and it is difficult to use in curve or three-dimensional welding

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