Fe-Al異材抵抗スポット溶接継手の強度向上に向けたIMC端部に関する検討

抄録

In resistance spot welding of steel and aluminum alloy, the thickness of the intermetallic compound (IMC) is known to be dominant. In order to form the intermetallic compound thinly, the heteromorphic electrodes in which the shape of the electrode is changed the top and bottom was developed. In this study, Reverse R type was newly developed. It was found that when the R type and the reverse R type are combined, the joint strength improves with welding current value increases. The electrode with the tip curvature of R25 on the steel side, the R25, the Flat electrode and the Reverse R type electrode on the Al alloy side were respectively placed. As a result, in the combination of R25 / Reverse R type, the joint strength was improved with welding current value increases. It then based on previous research, the relationship between the thickness of IMC edge and CTS was investigated. In addition, in order to study the relationship between the joint strength and the IMC in detail, the fracture form near the IMC edge was observed. From the above, it was suggested that the fracture mode near the IMC edge may greatly influence the CTS.