汽車用5182-H111鋁合金電阻點焊銅電極壽命研究

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Abstract： The life of copper electrode during resistance spot welding of 5182-H111 aluminum aloy with thickness of 1.2mm is studied，and the interface reaction between aluminum and copper is the key factor affecting the life of copper electrode，and the relationship between“resistance of copper electrode material to high temperature softening - softening channel during welding -life of copper electrode”is established.The relationship between resistanceofcopper electrode material to high temperature softening-softening channelduringwelding-life of copper electrode is established.The effects of the type and composition of copper electrode and the surface state of aluminum alloyon the electrode life were studied.The results show that when 5182-H111 rolled sheet is welded under the same welding processparameters，the corresponding life sequence of electrodes with diffrent copper electrode types and components is as follows： C15760>C18200>C18150>C18140>C15715， The corresponding electrode life of C15760 copper electrode life is 83 points，C18200 copper electrode life is 61 points，C18150 copper electrode life is 48 points， C18140 copper electrode is 43 points，and C15715 copper electrode life is 38 points.C15760 copper electrode was used for testing.Under the optimal process parameters coresponding to heir respective surface states，the electrode life sequence corresponding to diffrent aluminum alloy surface states was as follows：Passivated plate > clean plate > rolled plate，the electrode life of passivated aluminumalloyplateis380 points，the electrode lifeof cleaned aluminumalloyplate is26O points，and theelectrode lifeof rolled aluminum alloy plate is 83 points.

Keywords：5182-H111 aluminumalloy;Electrode life; Copper electrode; Surface state.

1序言

汽車輕量化是當(dāng)前的發(fā)展趨勢，若要實現(xiàn)輕量化，則主要有3種途徑：應(yīng)用高強輕質(zhì)材料、優(yōu)化車身結(jié)構(gòu)設(shè)計、采用先進應(yīng)用技術(shù)手段[1]。（剩余7691字）