Low-power resistance spot-welding process adopting multi-end electrode

Abstract

The invention discloses a low-power resistance spot-welding process adopting a multi-end electrode. The low-power resistance spot-welding process adopting the multi-end electrode is used for solving the problems of welding spatter, high welding penetration rate and the like caused by unstable single-point welding and excessive instantaneous welding heat input in an existing resistance spot-welding connection technology for thin-wall parts and filter screen parts. The low-power resistance spot-welding process adopting the multi-end electrode comprises the steps of cleaning and assembling for a welding test piece, pressing before welding, preheating before welding, welding, pressure maintaining after welding and the like, wherein the multi-end electrode is used for welding the welding test piece, the welding process of pressurizing, preheating, welding and maintaining is adopted, the whole welding process lasts for about 5 ms, the time of heat accumulation in a welding pressing process is shortened, the welding efficiency is increased, and the stability of product assembling is improved; and the spatter generated in the welding process can be effectively avoided, collapse, welding penetration and the like in the welding process are greatly reduced, resistance spot-welding connection for thin-wall filter screens and gaskets can be stably, efficiently and excellently realized, and a new technological reference is provided for welding for thin-wall filter screen parts.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a low-power multi-terminal electrode resistance spot welding welding process. Background technique [0002] Resistance spot welding is an efficient and stable pressure welding technology, which has many advantages such as high efficiency, stability, low consumption, environmental protection and easy automation. It can realize effective welding of non-ferrous metals such as aluminum, magnesium, copper and their alloys. It is used in aerospace, Rail transit and many other industries have been widely used. The heat required for resistance spot welding mainly comes from the heat generated by the Joule effect after electrification between the workpieces to be welded. The welding heat is mainly directly related to the welding current and welding time, that is, "Q=I 2 RT", the welding nugget formed during the welding process first starts at the point-like contact point after the elect...

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Problems solved by technology

[0003] In view of the deficiencies in the above-mentioned background technology, the present invention proposes a low-power multi-terminal electrode resistance spot welding welding process, which solves the single-point welding instability and The excessive instantaneous welding heat input leads to problems such as welding spatter and large welding penetration. Multi-terminal welding electrodes are simultaneously pressurized and welded at multiple points to realize efficient, stable and high-quality resistance spot welding connections of thin-walled parts and filter parts.

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