利用MD-40型中频直流逆变式点凸焊机,对汽车用6061铝合金板电阻点焊的工艺进行试验研究。运用正交试验方案及极差分析方法对工艺参数进行优化试验设计,采用撕裂试验等方式检验其点焊质量,并对焊点的力学性能进行拉伸测试,验证其可靠性...利用MD-40型中频直流逆变式点凸焊机,对汽车用6061铝合金板电阻点焊的工艺进行试验研究。运用正交试验方案及极差分析方法对工艺参数进行优化试验设计,采用撕裂试验等方式检验其点焊质量,并对焊点的力学性能进行拉伸测试,验证其可靠性。结果表明,当焊接电流22 k A、通电时间150 ms、电极压力0. 23 MPa时,所获得的点焊接头成型良好,无明显缺陷,其最大抗拉剪力值为3. 467 k N。展开更多
Friction stir spot welding with refilling by friction forming process （FSSW-FFP） was successfully modified using filler plate. Both of this new refilling technique and conventional friction stir spot welding （FSSW...Friction stir spot welding with refilling by friction forming process （FSSW-FFP） was successfully modified using filler plate. Both of this new refilling technique and conventional friction stir spot welding （FSSW） process were used to weld A1 6061-T6 lap shear specimens and the results were compared. Effects of tool rotational speeds on mechanical and metallurgical properties in both the cases were studied. Static shear strength of refilled weld samples was found to be better than those welded by conventional FSSW process at all tool rotational speeds. This is explained in terms of effective increase in cross-sectional area of weld nugget due to addition of more material from filler plate, thereby eliminating the probe hole. Failure mechanisms were discussed and fracture surfaces were analyzed through scanning electron microscopy （SEM）. The hardness profile of the welds exhibited a W-shaped appearance in both the processes and the minimum hardness was measured in the HAZ.展开更多
文摘利用MD-40型中频直流逆变式点凸焊机,对汽车用6061铝合金板电阻点焊的工艺进行试验研究。运用正交试验方案及极差分析方法对工艺参数进行优化试验设计,采用撕裂试验等方式检验其点焊质量,并对焊点的力学性能进行拉伸测试,验证其可靠性。结果表明,当焊接电流22 k A、通电时间150 ms、电极压力0. 23 MPa时,所获得的点焊接头成型良好,无明显缺陷,其最大抗拉剪力值为3. 467 k N。
文摘Friction stir spot welding with refilling by friction forming process （FSSW-FFP） was successfully modified using filler plate. Both of this new refilling technique and conventional friction stir spot welding （FSSW） process were used to weld A1 6061-T6 lap shear specimens and the results were compared. Effects of tool rotational speeds on mechanical and metallurgical properties in both the cases were studied. Static shear strength of refilled weld samples was found to be better than those welded by conventional FSSW process at all tool rotational speeds. This is explained in terms of effective increase in cross-sectional area of weld nugget due to addition of more material from filler plate, thereby eliminating the probe hole. Failure mechanisms were discussed and fracture surfaces were analyzed through scanning electron microscopy （SEM）. The hardness profile of the welds exhibited a W-shaped appearance in both the processes and the minimum hardness was measured in the HAZ.
