材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
論文
オーステナイト系ステンレス鋼溶接金属部における結晶粒粗大化の溶接諸条件依存性に基づいたX線応力測定の適用性評価
岡野 成威徳丸 大樹望月 正人
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2019 年 68 巻 4 号 p. 318-324

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This study examines the effect of welding conditions on the applicability of X-ray stress measurement at weld metal with coarsened grains. Testing material was low carbon austenitic stainless steel and 15 welded specimens were prepared through tungsten inert gas (TIG) welding under various welding conditions, in which five kinds of welding currents and three kinds of welding speeds were assigned in all combinations. In the X-ray stress measurement, 2θ-sin2ψ method was applied and then the effectiveness of enlarging a diameter of collimator and applying additional planer oscillation for weld metal with coarsened grains was evaluated. Meanwhile, the effect of welding conditions on crystal grain coarsening at weld metal was examined based on welding thermal conduction theory with a moving point heat source. The results showed that the mean crystal grain size at weld metal correlated linearly with the parameter derived from the welding thermal conduction theory. Based on relation between X-ray irradiation area and the mean crystal grain size, the effect of the welding conditions on the applicability of X-ray stress measurement with or without enlarging a diameter of collimator and applying additional planer oscillation was systematically evaluated.

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