調質高張力鋼潜弧溶接熱影響部の切欠靱性と溶接軟化に関する研究(第 4 報) : 層ビード潜弧溶接熱影響部の切欠靱性と溶接軟化におよぼす合金元素の影響に関する推計学的解析

概要

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Linear regression analyses were made to show the effect of alloying elements and welding conditions on mechanical properties of submerged-arc weld heat-affected zone quantitatively. Alloying elements which decrease weld softening and are highly significant are carbon, chromium, molybdenum, and vanadium. Cooling rate of weld bond is also highly significant and the increase of cooling rate decreases weld softening. Factors which improve notch toughness of weld bond and are highly significant are increase of weld bond cooling rate and addition of vanadium. Silicon, nickel and molybdenum are effective in improving notch toughness of weld bond, they are little significant. Alloying elements which deteriorate notch toughness of weld bond are carbon, manganese, chromium, aluminium and boron, and carbon and manganese are highly significant, but addition of manganese and chromium seems to be necessary to have bainitic structures in weld bond. And carbon equivalents for notch toughness of weld heat-affected zone and softened zone strength are presented for quenched and tempered high tensile steel. The effect of alloying elements on notch toughness of middle heat-affected zone and quenched and tempered plate is not always consistent with that of weld bond.
1971-07-25