50kgf/(mm)^2 級球状黒鉛鋳鉄の電子ビーム溶接に関する研究 : ポロシテイにおよぼす溶接条件の影響(<特集>アーク溶接ロボットの現状)

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This report describes the effect of welding conditions on porosities for electron beam welding of 50Kgf/(mm)^2 class nodular cast iron (6,12,18mm thickness) with SUS304 (0.5mm thickness) as insert metal. The results obtained in this experimental investigation are summarized as follows; (1) Amount of porosities of the fusion zone remarkably decreases by pretreatment annealing (950℃×5hr). (2) For the range of a_b value from 0.7 to 0.9,well type beads are formed and no crack is observed. (3) For the range of a_b value more than unity, wedge type beads are formed and weld cracks occurred and porosities increased. (4) Amount of porosities has tendency to decrease as beam current increase and to increase as welding speed increase. (5) For base metal of 6,12mm thickness, amount of porosities is remarkably decreased by 1 pass weld and for 18mm thickness remarkably decreased by 2 passes weld. (6) Under optimum welding conditions, sufficient strength of the welded joint can be obtained.
1982-09-05