Role of zinc layer in resistance spot welding of aluminium to steel

Effects of zinc layer on microstructure and mechanical behavior of resistance spot welds of aluminum to galvanized (GS-Al joint) and low carbon steel (PS-Al joint) were explored. The results showed that although nugget ‘volume’ in PS-Al joint was larger, the nugget ‘diameters’ of PS-Al and GS-Al joi...

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Veröffentlicht in:Materials & design 2016-07, Vol.102, p.106-114
Hauptverfasser: Arghavani, M.R., Movahedi, M., Kokabi, A.H.
Format: Artikel
Sprache:eng
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Zusammenfassung:Effects of zinc layer on microstructure and mechanical behavior of resistance spot welds of aluminum to galvanized (GS-Al joint) and low carbon steel (PS-Al joint) were explored. The results showed that although nugget ‘volume’ in PS-Al joint was larger, the nugget ‘diameters’ of PS-Al and GS-Al joints were almost the same in size since the melted zinc layer was pushed toward the outer regions of the nugget. Melting and evaporation of zinc coat led to reduction of Al-Fe intermetallic layer thickness. Presence of zinc also reduced the fixture-induced tensile stress. Utilizing carbon steel fixtures during welding caused a sensible vibration in the joint members. The vibration resulted in fragmentation and decrease of the intermetallic compounds at the joint interface. Moreover, while PS-Al joints showed higher strength than that of GS-Al ones at the welding currents
ISSN:0264-1275
1873-4197
DOI:10.1016/j.matdes.2016.04.033