Method and device for testing thermal circulation parameters of laser welding

Abstract

The invention relates to a method and a device for testing thermal circulation parameters of laser welding. The method comprises the following steps that: firstly, a wedge-shaped strip is placed between two welding test plates, the end surface of the welding test plate corresponding to the inclined plane of the wedge-shaped strip serves as a thermometric surface, a plurality of through holes for holding thermocouples are evenly distributed along the end surface of the welding test plate, and the thermocouples are arranged in the through holes correspondingly, and the wedge-shaped strip is tightly connected with the thermometric surfaces of the thermocouples; hereto, the thermometric surface and a weld metal of the laser welding form a certain angle; and then the bottom of the wedge-shapedstrip serves as the starting end for the welding, the top of the wedge-shaped strip serves as the finishing end for the welding, and along with the movement of a laser welding heat source, the evenlydistributed and embedded thermocouples can gradually approach the weld metal so as to obtain the thermal circulation parameters of positions at different distances from a vertical line of a seam. Themethod and the device can satisfy the test of the thermal circulation parameters in a heat-affected zone of the laser welding, and overcome the difficult problems in the conventional thermometric method and a conventional system.

Description

technical field [0001] The invention relates to laser welding technology, in particular to a method and a device for testing laser welding thermal cycle parameters of heat-affected zone temperature during rapid laser heating and cooling. Background technique [0002] As a high-efficiency and energy-saving welding method, laser welding has broad application prospects in the manufacture of large structures. During laser welding, the laser beam forms a linear heat source in the thickness direction of the plate, and the energy density is high. Compared with other welding methods, the welding heat input is very small, and the weld bead and heat-affected zone are narrow. , the amount of deposited metal is the least, the thermal expansion and thermal contraction in the thickness direction are uniform, the welding deformation is small, and the welding quality is easy to guarantee. [0003] During the welding process, the structure and properties of the base metal adjacent to the we...

AI Technical Summary

Problems solved by technology

Although this method can roughly measure the thermal cycle of laser welding, the measurement accuracy is not as high as the contact measurement accuracy, and the system is relatively complicated.

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