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

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...

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