以铝质铆钉为单元件的铝合金/钢的电阻单元焊

Resistance element welding between aluminum alloy and steel with an aluminium rivet

以腿径为6 mm的铝质铆钉为单元件对铝合金A6061与低碳钢Q235进行电阻单元焊,并利用扫描电镜对接头界面区域进行了组织观察,研究了焊接电流、焊接时间对接头抗剪载荷和十字抗拉载荷的影响。结果表明:焊接电流大于18 kA时,靠近熔核的铆钉腿与上板钢的界面、上板钢与下板铝合金间界面生成了金属间化合物层。随着焊接电流增大、焊接时间的增加,接头的抗剪载荷和十字抗拉载荷均呈先增大后下降的变化趋势;当焊接电流为26 kA、焊接时间为300 ms、电极压力为3.1 kN时,接头的抗剪载荷达到最大,其值约为5.86 kN。

The resistance element welding of aluminum alloy A6061 and low carbon steel Q235 was carried out with an aluminum rivet with leg diameter of 6 mm as the element,and microstructure of the joint interface area was observed by scanning electron microscopy.The effects of welding current and welding time on tensile shear load and cross tension load of the joint were studied.The results show that when the welding current is greater than 18 kA,the intermetallic compound layer is formed at the interface between the rivet leg near the nugget and the upper plate steel,and between the upper plate steel and the lower plate aluminum alloy.With the increase of welding current and welding time,the tensile shear load and cross tension load of the joint first increase and then decrease.When the welding current is 26 kA,the welding time is 300 ms,and the electrode pressure is 3.1 kN,the tensile shear load of the joint reaches the maximum,which is about 5.86 kN.