Method and device for generating single longitudinal columnar crystal welding seam

A columnar crystal, longitudinal technology, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of single, unable to control the grain direction of the weld, and poor performance of the transverse columnar crystal weld

Active Publication Date: 2021-05-14
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 di...

Method used

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  • Method and device for generating single longitudinal columnar crystal welding seam
  • Method and device for generating single longitudinal columnar crystal welding seam
  • Method and device for generating single longitudinal columnar crystal welding seam

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Embodiment

[0072] Such as figure 1 As shown, the single longitudinal columnar grain welding seam welding device in this embodiment includes: main welding torch 1, auxiliary welding torch 2, cold source nozzle 3, welding torch clamping tool 4, weldment 5, weldment clamping tooling 6, liquid nitrogen tank 7. Connecting pipe 8.

[0073] The main welding gun 1, the auxiliary welding gun 2 and the cold source nozzle 3 are connected with the welding gun clamping tool 4, wherein the main welding gun 1 is fixed on the front end (welding direction) of the welding gun clamping tool 4, and the cold source nozzle 3 is clamped on the front of the main welding gun. Rear, and link to each other with liquid nitrogen tank 7 by connecting pipe 8. Two auxiliary heat source welding torches 2 are located obliquely behind the main welding torch, and are clamped symmetrically. The relative position of the auxiliary welding torch 2 and the cold source nozzle 3 relative to the main welding torch 1 can be moved...

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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...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/32
Inventor 金成刘明筋
Owner DALIAN JIAOTONG UNIVERSITY
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