Weld strength, formability, and impact resistance for joints on automotive steels are dependent on the underlying microstructure. A martensitic weld area is often a precursor to reduced mechanical performance. In this paper, efforts are made to predict underlying joint microstructures for a range of processing approaches, steel types, and gauges. This was done first by calculating cooling rates for some typical automotive processes [resistance spot welding (RSW), resistance mash seam welding (RMSEW), laser beam welding (LBW), and gas metal arc welding (GMAW)]. Then, critical cooling rates for martensite formation were calculated for a range of automotive steels using available thermodynamically based phase transformation models. These were then used to define combinations of process type, steel type, and gauge where welds could be formed avoiding martensite in the weld area microstructure.
Predictions of microstructures when welding automotive advanced high-strength steels
Welding Journal, New York ; 85 , 5 ; 111s-116s
2006
6 Seiten, 7 Bilder, 2 Tabellen, 26 Quellen
Article (Journal)
English
Advanced high strength steels for automotive industry
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