The DP600 steels have presented new challenges to the conventional practice of resistance spot welding. In developing process requirements to spot weld stacks of two identical DP600 steel sheets, a statistical method was applied in order to establish empirical relationships between the type of weld fracture during quality control (i.e., interfacial vs. button pullout), the weld current, the weld time, and the sheet thickness independent of chemical composition and galvanized coating. The selected methodology was so successful that maps to select process parameters were developed for spot welding 0.9- to 2.2-mm-thick DP600 steels. This study also confirmed that weld diameter was a primary factor influencing type of weld fracture. A new relationship between minimum weld diameter to prevent interfacial fracture during quality control and sheet thickness was also determined, and compared with several resistance spot weld standards.
Development of requirements for resistance spot welding dual-phase (DP600) steels. Part 2: Statistical analyses and process maps
Welding Journal, New York ; 84 , 12 ; 197s-204s
2005
8 Seiten, 16 Bilder, 15 Quellen
Article (Journal)
English
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