A method and device for generating a single longitudinal columnar grain weld

Abstract

The invention belongs to the technical field of welding seam generation, and discloses a method and a device for generating a single longitudinal columnar crystal welding seam. A welding cold source and an auxiliary heat source are applied at a specific spatial position to adjust the welding temperature field to realize warhead-shaped welding. molten pool, and finally generate a single longitudinal columnar grain welded structure. The device for generating a single longitudinal columnar grain weld includes: a main welding system, a welding cold source system, an auxiliary heat source system, a welding torch clamping tool, and a weldment clamping tool. The invention provides a new method for welding directionally solidified materials, changes the heat flow direction in the conventional welding method, and greatly improves the direction consistency of the columnar crystal crystallization of the welding seam. The generated "bullet-shaped" welding pool is one of the important features of the present invention, which is the key to changing the direction of welding heat flow and generating a longitudinal columnar crystal weld; the generated single longitudinal columnar crystal structure weld is another aspect of the present invention. Important feature that significantly improves the mechanical properties of welded joints in specific directions.

Description

technical field [0001] The invention belongs to the technical field of welding seam generation, and in particular relates to a method and a device for generating a single longitudinal columnar crystal welding seam. Background technique [0002] A welded seam is a seam formed by melting and connecting the welding rod and the metal at the seam by using the high temperature of the welding heat source. The shape, size and direction of the weld grain determine and affect the overall performance of the weldment. Especially for welds with special performance requirements in a certain direction, it is hoped that the weld grains have a consistent orientation. [0003] However, at present, the known grain shape of the weld is composed of columnar grains and equiaxed grains, and the shape and direction of the grains cannot be precisely regulated. Bent columnar grains or weld structures with equiaxed grains do not have special properties in specific directions because there is no sing...

AI Technical Summary

Problems solved by technology

[0006] (1) In the prior art, it is impossible to generate a single columnar crystal weld structure parallel to the direction of the weld (that is, the longitudinal direction)

[0007] (2) In the existing technology, it is impossible to precisely control the grain direction of the weld

[0008] (3) In the current technology, the performance of the generated transverse columnar grain weld is poor

[0009] (4) In the prior art, it is impossible to form a molten weld pool with a solidification front perpendicular to the weld seam direction

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