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

Journal of Iron and Steel Research(International) 2011年第S1期18卷 724-729页

作者： Bhole S.D Khan M.S Department of Mechanical and Industrial Engineering Ryerson University350 Victoria StreetTorontoONM5B 2K3Canada

The application of advanced high strength steels in automotive industry has highlighted the need for research into spot weldability of these *** weld lobe diagrams,the spot weldability of DP600 steel was found to be poor with conventional weld *** 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 *** the three possible control strategies proposed,especially with AC welding equipment,the dynamic resistance signal is easily obtained and the least *** phenomena,microstructural characterization and mechanical properties of spot-welded hot dipped galvanized DP600 steel and interstitial free steel were *** work on dissimilar welds in DP 600 and HSLA 350 was also conducted with emphasis on tensile and fatigue properties and fracture *** performance of dissimilar spot welds was different from that of the similar spot welds in each of the HSLA350 and DP600 *** DP600 weld properties played a dominating role in the hardness and tensile properties of the dissimilar spot ***,the fatigue performance of the dissimilar welds was similar to that of the HSLA *** 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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