2020 Volume 27 Issue 108 Pages 108_17-108_29
CJP groove weld joints between column made of BCP325, and through-diaphragms were fabricated with CO2 gas-shielded arc welding process with YGW18 electrode to examine the effect of weld heat input on the weld metal strength. The welding was performed by the welding robots. From coupon test results with the specimens extracted from the corner and flat part weld joints, it was found that the weld metal strength at the corner joint was a few % lower than that at the flat part joint, resulting in undermatched weld joint for the comer base metal. The weld heat input had small effects on the weld metal strength near the weld toe, where the ductile crack initiates when the column subjects to flexure.
