铝钢点焊铆接复合连接技术

提出了一种点焊与铆接复合进行铝钢连接的技术,即在待焊试样区域预制工艺孔,将铆钉铆入孔中,利用铆接力实现试样的预连接.然后使用点焊机在铆接位置进行点焊,实现铆接与点焊的复合连接,称为"点铆焊".文中分析了该方法的力学性能、微观组织、断裂模式,并同纯点焊与纯铆接进行了比较.结果表明,点铆焊的抗拉强度比纯点焊提高了23.8%,比纯铆接提高了28.7%,失效前吸收功比纯点焊提高211%,比纯铆接提高67%.虽然在点铆焊过程中也会产生脆性金属间化合物,但这些区域并不是主要的承载部位,点铆焊为塑性断裂模式.

A combination joining technology of spot welding and riveting for aluminum and steel

A combination joining technology of spot welding and riveting for aluminum and steel was proposed. First, a technique hole was prefabricated at the area to be welded and the rivet was riveted to the hole, the specimen were prejoined by rivet force. Then, a spot welding machine was used to weld the riveting area to realize the combination joining of spot welding and riveting. The technology is called "spot riveting welding"(SRW). The mechanical properties, microstructure and fracture mode of Al/Steel joints made by this technology were investigated. The results show that the tensile shear load of SRW joints increased by 23.8% than resistance spot welding joints and 28.7% than riveting joints, absorbed energy before destruction of SRW joints increased by 211% than resistance spot welding joints and 67% than riveting joints. Although the brittleness intermetallic compound was formed during spot riveting process, these areas are not the main load bearing parts. Spot riveting welding presented a plastic fracture mode.