Effect of hold time on resistance spot weldability of aluminium to steel

• DOI: 10.1080/13621718.2022.2080448
• Publication Date: 2022-05-27T06:52:18Z
• Authors: Xianming Meng; Siwei Li; Liting Shi; Yongqiang Zhang; Yajun Chen; Sai Zhang; Hao Wu
• Keywords: Weldability; Spot welding

The effects of welding hold time on weld quality aluminium alloy to dual-phase steel resistance spot welds were studied. Results demonstrated that there existed an optimum range (350∼500 ms), within which the largest nugget diameter (7.6 mm), thinnest intermetallic compound (IMC) layer (1∼5 µm) and maximum tensile shear peak load (4.7 kN) obtained. Too short led shrinkage, small thick IMC due reduced heat dissipation after removing electrodes, thus resulting in low brittle fracture along layer. While too long time, i.e. 750 ms, produced a smaller more rapid dissipation.