Method and device for generating single longitudinal columnar crystal welding seam

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-following cold source and an auxiliary heat source are applied on a specific spatial position, a welding temperature field is adjusted, a bullet-shaped welding pool is realized, and a single longitudinal columnar crystal welding structure is finally generated. The device for generating the single longitudinal columnar crystal welding seam comprises a main welding system, the welding-following cold source system, the auxiliary heat source system, a welding gun clamping tool and a weldment clamping tool. The invention provides a novel method for welding a directional solidification material, the heat flow direction in a conventional welding method is changed, and the direction consistency during crystallization of columnar crystals of the welding seam is greatly improved; the generated bullet-shaped welding pool is one of the important characteristics of the method, and is the key to change the welding heat flow direction and generate the longitudinal columnar crystal welding seam; the generated single longitudinal columnar crystal structure welding seam is another important characteristic of the method, and the mechanical property of a welding joint in a specific direction can be obviously improved.

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...

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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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