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ARUN LALACHAN,SIVA PRASAD MURUGAN,KIM KYUNG-YOUNG(김경영),SHIN JI-YOUNG(신지영),DOOYOUNG KIM(김두영),GONG HO-YOUNG(공호영),YEONG DO PARK(박영도) 대한용접·접합학회 2021 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2021 No.5
Efforts to reduce the vehicle weight and improve the crash performance have led to the increased application of advanced high strength steels (AHSS) into the automotive architecture. Although resistance spot welding and laser welding are mainly used for joining thin sheets in the car body. these joining methods poses a problem of reachability in chassis part. To overcome this issue, arc plug welds are invented as a novel method for joining steel sheets in chassis part. These shift in joining procedure to arc plug welds, consequently propelled the need for the understanding of the plug weldability of various steel sheets. In this study, to investigate the plug weldability, a comparative evaluation of six steel sheets ranging from 440MPa to 1500MPa with similar thickness of 1.0 mm has been done by using ER110S wire in 8:2 Ar-CO2 atmosphere with a circular hole of 6.0 mm diameter. The static tensile shear strength and microstructure of these arc plug welds with similar effective interfacial weld diameter of 6.0 mm are detailed. It was found that the AHSS consistently achieved high tensile shear strength compared to the conventional steel grades. The differences in failure mode are attributed due to the HAZ softening and weld metal hardness.