Ni在钢/铝电阻点焊中的作用

以DC01钢板与5082铝合金板为基材,在电极压力3 kN、焊接时间300 ms、保持时间100 ms条件下,研究了电阻点焊中焊接电流(9~12 kA)及Ni镀层对接头剪切力、正拉力、界面相组成的影响。结果表明,随焊接电流的提高,熔核尺寸增大,接头力学性能提高。剪切力比正拉力高一个数量级。在10 kA焊接电流下,镀Ni钢/铝接头的剪切力和正拉力均比钢/铝直接焊接时强度明显提高,这与钢/铝界面形成了Al 3Ni合金相,抑制了脆性Fe 2Al 5金属间化合物的生成有关。

Effect of Ni on steel/aluminum resistance spot welding

Taking DC01 steel plate and 5082 aluminum alloy plate as the base material,effects of welding current(9-12 kA)and Ni coated layer on shear strength,normal tensile strength and interfacial phase composition of resistance spot welded joint were studied under conditions of electrode pressure 3 kN,welding time 300 ms and holding time 100 ms.The results showed that nugget size and the strength of the joint increased with the increase of welding current.The shear force of Ni coated steel/aluminum joint was one order of magnitude higher than that of normal tension.Under 10 kA welding current,the shear force and normal tension of Ni coated steel/aluminum joint were significantly higher than those of steel/aluminum direct welding,which was due to the formation of Al 3 Ni phase at the steel/aluminum interface,which inhibited the formation of brittle Fe 2 Al 5 intermetallic compound.