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Unequal-thickness resistance spot welding method for GH4169 nickel-based high-temperature alloy clamp and strap

A nickel-based superalloy, GH4169 technology, applied in resistance welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of small heat input, reduced strength, large welding deformation of parts, etc., to improve the use function and reduce welding deformation And assembly error is small, the effect of improving reliability

Pending Publication Date: 2021-02-09
安徽天航机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Laser spot welding uses laser as the heat source. The spot welding speed is fast, the precision is high, the heat input is small, and the accessibility of the laser is relatively good. It is suitable for spot welding positions and parts with complex structures. There is an obvious phenomenon of sinking. With the increase of laser power and duration, the sinking depth of the surface of the solder joint increases. In the case of a large duration or gap size, the lower surface will also appear concave, resulting in the welding of parts. Large deformation and rapid loss of strength

Method used

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  • Unequal-thickness resistance spot welding method for GH4169 nickel-based high-temperature alloy clamp and strap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] (A) Pretreatment of GH4169 nickel-based superalloy clamps and GH4169 nickel-based superalloy bands: the thickness of the clamps used is 1.5mm, and the thickness of the bands is 0.8mm. Both materials are GH4169 nickel-based superalloys. The parts to be welded of the collar and the hoop are polished with SiC sandpaper to remove the oxide film existing on the surface, and then the surface of the hoop is cleaned with acetone and water to obtain a pre-treated workpiece. Finally, the pre-treated workpieces are placed on the welding table in the form of lap joints, and fixtures are used to ensure that there is no gap between the two unequal thickness workpieces.

[0040] (B) The electrode preload is applied by the spot welding robot, in which the upper and lower electrode heads are conical electrodes, the end diameter of the electrode is 3.5mm, the applied electrode preload is 9KN, and the preload time is 50ms. The pressure sensor and other feedback components are used to accu...

Embodiment 2

[0046](A) Pretreatment of GH4169 nickel-based superalloy clamps and GH4169 nickel-based superalloy bands: the thickness of the clamps used is 1.5mm, and the thickness of the bands is 0.8mm. Both materials are GH4169 nickel-based superalloys. The parts to be welded of the collar and the hoop are polished with SiC sandpaper to remove the oxide film existing on the surface, and then the surface of the hoop is cleaned with acetone and water to obtain a pre-treated workpiece. Finally, the pre-treated workpieces are placed on the welding table in the form of lap joints, and fixtures are used to ensure that there is no gap between the two unequal thickness workpieces.

[0047] (B) The electrode preload is applied by the spot welding robot, where the upper and lower electrode heads are cylindrical planar electrodes, the end diameter of the electrode is 4mm, the applied electrode preload is 8.5KN, and the preload time is 50ms. The pressure sensor and other feedback components are used ...

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Abstract

The invention relates to an unequal-thickness resistance spot welding method for a GH4169 nickel-based high-temperature alloy clamp and strap. The method comprises the following specific steps that pre-treatment is carried out, wherein SiC abrasive paper is utilized for roughly removing an oxidization film existing on the surfaces of the GH4169 nickel-based high-temperature alloy clamp and the GH4169 nickel-based high-temperature alloy strap; a spot welding machine loads electrode pre-pressure to achieve close attaching at the welding position of a welded workpiece; the spot welding machine connects welding current to a welding area to carry out welding pre-heating, the welding current is increased gradually until the welding current is stable, the welding pressure is kept, and a weld coreis formed in the welding area; the welding current is cut off, and the welding pressure continues to be kept; and the resistance spot welding machine is utilized for adjusting a welding path to complete welding of the next welding point. According to the method, the problem of welding core deviation easily occurring in the resistance spot welding process of workpieces with different thicknesses is effectively solved, and the welding core quality and the reliability of the resistance spot welding technology are greatly improved. The overall actual use function of the clamp is greatly improved.The accuracy and consistency of welding point positions are ensured.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a resistance spot welding method of GH4169 nickel-based superalloy clamps and bands with unequal thicknesses. Background technique [0002] GH4169 superalloy is a nickel-iron-chromium-based superalloy, which not only has good fatigue resistance, oxidation resistance, radiation resistance and corrosion resistance, but also has good processing performance and welding performance, so it is widely used in the aerospace field. At present, the common spot welding processes are mainly laser spot welding and resistance spot welding. Laser spot welding uses laser as the heat source. The spot welding speed is fast, the precision is high, the heat input is small, and the accessibility of the laser is relatively good. It is suitable for spot welding positions and parts with complex structures. There is an obvious phenomenon of sinking. With the increase of laser power and duration, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/11B23K11/34B23K11/16
CPCB23K11/11B23K11/34B23K11/16
Inventor 袁荣吴敏陈建彬张涛方军陶悦陈浩姬云峰
Owner 安徽天航机电有限公司
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