A Study of Spot Welding of Advanced High Strength Steels for Automotive Applications

查看全文 作　　者：Bhole [1]S.D;Khan [1]M.S

机构地区：[1]Department of Mechanical and Industrial Engineering,Ryerson University,350 Victoria Street,Toronto,ON,M5B 2K3,Canada

出　　处：《Journal of Iron and Steel Research(International)》索引2011年第18卷第S1期,共6页

基　　金：the Natural Sciences and Engineering Research Council(NSERC)of Canada for providing financial support 摘　　要：The application of advanced high strength steels in automotive industry has highlighted the need for research into spot weldability of these steels.Using weld lobe diagrams,the spot weldability of DP600 steel was found to be poor with conventional weld schedules.An enhanced weld schedule consisting of two pulses with reduced current on the second pulse gave a substantial increase in the lobe width;the first pulse removed the zinc coating and the second pulse controlled the nugget growth.A data acquisition system was designed to monitor weld expulsion during the weld operation.Of the three possible control strategies proposed,especially with AC welding equipment,the dynamic resistance signal is easily obtained and the least expensive.Expulsion phenomena,microstructural characterization and mechanical properties of spot-welded hot dipped galvanized DP600 steel and interstitial free steel were investigated.Further work on dissimilar welds in DP 600 and HSLA 350 was also conducted with emphasis on tensile and fatigue properties and fracture characteristics.The performance of dissimilar spot welds was different from that of the similar spot welds in each of the HSLA350 and DP600 steels.The DP600 weld properties played a dominating role in the hardness and tensile properties of the dissimilar spot welds.However,the fatigue performance of the dissimilar welds was similar to that of the HSLA welds.Details will be presented at the conference. 关键词：RESISTANCE SPOT welding dynamic RESISTANCE NUGGET DIAMETER and HARDNESS dissimilar materials microstructure mechanical properties FATIGUE fracture mode

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A Study of Spot Welding of Advanced High Strength Steels for Automotive Applications

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