Resistance spot welding is the most popular joining process in automobile body assembly production lines. There have been many researches concerned with spot welding for two pieces of sheets. In order to reduce the cost and improve the strength of the lightweight automobile bodies, resistance spot welding for multi-pieces of sheets has to be investigated before production. In this paper, resistance spot welding for three pieces of high strength steel sheets is mainly taken as an object and the nugget formation process is firstly investigated by experiments. Then the spot welding process is simulated by FEM program JWRIAN developed by the authors with the coupling of the electrical field, thermal field and mechanical field. The nugget size and its formation process predicted by FEM agree very well with experimental results. Based on the simulation results, weldable conditions (current, cycles and force) of spot weldingfor both two pieces and three pieces of high strength steel sheets can estimated with a good accuracy.
Numerical and experimental study on nugget formation in resistance spot welding for high strength steel sheets in automobile bodies
Transactions of JWRI (Japan Welding Research Institute) ; 38 , 2 ; 19-24
2009
6 Seiten, 16 Bilder, 2 Tabellen, 12 Quellen
Article (Journal)
English
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