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Priority claimed from JP2004301823Aexternal-prioritypatent/JP4528089B2/en
Application filed by Nippon Steel CorpfiledCriticalNippon Steel Corp
Publication of MY158395ApublicationCriticalpatent/MY158395A/en
A LARGE-HEAT-INPUT BUTT-WELDED JOINT OF WELDED STRUCTURES PREPARED BY BUTT-WELDING HIGH-STRENGTH STEEL PLATES OVER 50 MM IN THICKNESS, HAVING EXCELLENT BRITTLE FRACTURE RESISTANCE, IS CHARACTERIZED BY: (A1) THE HARDNESS OF THE WELD METAL IS NOT MORE THAN 110% OF THE HARDNESS OF THE BASE METAL OR (A2) THE HARDNESS OF THE WELD METAL IS NOT LESS THAN 70% AND NOT MORE THAN 110% OF THE HARDNESS OF THE BASE METAL, AND, AS REQUIRED, (B) THE WIDTH OF THE WELD METAL IS NOT MORE THAN 70% OF THE PLATE THICKNESS OF THE BASE METAL, (C) THE WIDTH OF THE REGION AFFECTED BY WELDING WHOSE HARDNESS IS SOFTENED TO NOT MORE THAN 95% OF THE HARDNESS OF THE NON-HEAT-AFFECTED BASE METAL HAS A WIDTH NOT LESS THAN 5 MM, AND/OR (D) THE PRIOR AUSTENITE GRAIN SIZE IN THE HEAT-AFFECTED ZONE (HAZ) CONTACTING THE WELDING FUSION LINE IS NOT MORE THAN 200 ?M. (FIG.4)
Resistance spot welding unit and resistance spot welding method, and resistance spot welded joint and method for manufacturing resistance spot welded joint.
The Performance of Tailor Welded Blanks Using High Strength Steel Sheets for Practical Use-The Study of Tailor Welded Blanks Using Automotive High Strength Steel Sheets: Report 2