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Resistance Spot Weldability of Surface Roughness Textured Galvannealed Steel Sheets  

Park, Sang-Soon (Dept. of Advanced Material Engineering, Dong-eui University)
Kim, Ki-Hong (Dept. of Advanced Material Engineering, Dong-eui University)
Kang, Nam-Hyun (Division of Materials Science and Engineering, Pusan National University)
Kim, Young-Seok (Division for Dongnam Area Technology Service, Korea Institude of Industrial Techology)
Rhym, Young-Mok (Korea Institute of Materials Science Materials Test & Characterization Group)
Choi, Yung-Min (Automotive Steel Products Research Group, Technical Research Labs., POSCO)
Park, Yeong-Do (Dept. of Advanced Material Engineering, Dong-eui University)
Publication Information
Korean Journal of Metals and Materials / v.46, no.8, 2008 , pp. 495-505 More about this Journal
Abstract
With the high proportion of zinc coated steels in body-in-white assembly, newly developed surface roughness textured galvannealed steel sheets have been introduced. In this study, zinc coated and surface roughness textured steel sheets were welded by resistance spot welding to investigate its weldability including electrode wear test. Based on the results of tensile-shear test, nugget diameter changes, and electrode tip growth test, it was clear that both surface roughness textured steels (GA-T and GA-E) showed good weldability. Also, there was no large difference in weldability and electrode wear behavior between GA-T and GA-E steels which have different surface roughness morphology. An analysis of electrode degradation showed Fe and Zn penetration through the electrode tip surface at 2400 welds reached $55{\sim}60{\mu}m$ and $75{\sim}80{\mu}m$, respectively. Therefore, there is no significant effect of surface roughness morphology on spot weldability of surface roughness textured galvannealed steel sheets. However, slight difference in thickness of alloying layers existing on electrode tip was found between GA-T and GA-E steels.
Keywords
resistance spot welding; surface roughness; galvannealed steel; lobe curve; dynamic resistance; penetration; electrode tip alloying;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By Web Of Science : 0  (Related Records In Web of Science)
Times Cited By SCOPUS : 0
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