METHOD FOR EVALUATING SUSCEPTIBILITY TO LIQUID METAL EMBRITTLEMENT CRACKING IN RESISTANCE SPOT WELDED PORTION OF STEEL SHEET

Abstract: a method for evaluating susceptibility to liquid metal embrittlement cracking in a resistance spot welded portion of a steel sheet that enables highly accurate and quantitative evaluation is provided. the method includes: overlapping a first steel sheet and a second steel sheet, one or both of which are galvanized steel sheets, without an intervening gap to obtain a sheet combination, sandwiching the sheet combination between a pair of electrodes, and applying current and pressure via the electrodes to perform resistance spot welding; applying to a welded portion of the second steel sheet at the same time as or after the end of the current application; then observing the welded portion of the second steel sheet to ascertain the presence or absence of liquid metal embrittlement cracking; and evaluating susceptibility to liquid metal embrittlement cracking in the welded portion based on the observation result.

Inventor(s): Koichi YASUDA, Rinsei IKEDA, Ayaka MIYAKE, Nao KAWABE, Katsutoshi TAKASHIMA, Yasuaki OKITA

CPC Classification: G01N33/207 (INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing processes other than immunoassay, involving enzymes or microorganisms , ))

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