On the Britlleness of Heat-Affedcted Zone (Report 10)

Weldability of Semi-Killed Steel Plate

Abstract

Directionality, sensitivities for the straining and heat-treatment, influence of hydrogen for the weldability of semi-killed steel plate were investigated, using some kinds of arc-welding covered electrodes, those produce the weld metals with different contents of hydrogen. Hydrogen, which transfered from weld-metal to heat-affected zone (H.A.Z.), increases the max. hardness and decreases toughness of H.A.Z., further, promotes the accurence of under-bead-crack, which mainly caused by the laminar segregation in the steel plate. min. toughness of H.A.Z. were recognized in the neighbour of bond, A₁ and A₁+3mm.