極低回転速度で摩擦攪拌接合した高強度パイプ用鋼のミクロ組織と機械的特性

抄録

In the previous study, it is possible to achieve defect-free weldment. However, there was a marked decline in mechanical properties, because of martensite transformation which is induced by high peak temperature during process. In the present study, FSW was applied to K55 API-grade steel maintaining low temperature during process by controlling welding parameter and then microstructure and mechanical properties of the welds were examined.