Laser welding method and device for laser welding

Abstract

The invention relates to a laser welding method. The method comprises the following steps: generating laser beams with energy in Gaussian distribution; enabling the generated laser beams to form parallel beams through optical transformation, wherein the energy of the parallel beams is in Gaussian distribution; shaping the parallel beams with energy in Gaussian distribution into parallel beams withenergy in uniform distribution; and focusing the parallel beams with energy in uniform distribution to a welding part. The invention also relates to a device for laser welding using the method. Withthe method and the device, the welding defects caused by uneven heating can be reduced, and meanwhile, the device for laser welding is simplified, so that welding is carried out under the condition that the relative position between the device and a welding piece is not changed.

Description

technical field [0001] The present invention relates to the field of laser welding, and more specifically, to a laser welding method and a device for laser welding. Background technique [0002] This section provides background information related to the present disclosure which does not necessarily constitute prior art. [0003] Laser welding has been used in the welding of metals and plastics. It uses the characteristics of high laser energy and low attenuation during propagation, focuses the laser on the welding part of the welded part, uses laser energy to heat and melt the welding part, and The melted welded parts are pressed and held until they cool and are welded together. [0004] However, the laser beam emitted by most lasers is a Gaussian beam, that is, the energy distribution of its cross section obeys a Gaussian function. Therefore, the energy density at the center of the spot is much higher than that at the edge of the spot, resulting in a much higher temperatu...

AI Technical Summary

Problems solved by technology

Although the shaped diffractive optical element can redistribute the energy of the laser beam, the refraction, reflection and transmission will occur when the laser passes through the shaped diffractive optical element, resulting in the loss of beam energy and increasing the temperature of the shaped diffractive optical element; at the same time, due to Diffraction phenomenon belongs to spatial distribution, so different spatial positions will form diffraction spots with different uniformity

[0008] In addition, since the focusing lens is located behind the reflector, the size of the focused spot will change between the center and the edge, so it is only suitable for small-format welding; at the same time, because the focal length cannot be changed, this arrangement is only suitable for welding on a relatively approximate plane Welding operation can be performed on the welded part of the three-dimensional configuration.

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