厚板溶接部の溶接割れ防止の研究(第 1 報) : 溶接金属中の拡散性水素の分布と後熱処理によるその変化

概要

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This paper deals with the diffusible hydrogen in multilayer weldment with plate thickness 100mm to 200mm. The hydrogen distribution in thick weldment are examined by the experiment. The following facts were clarified. (1) Diffusible hydrogen content in weld metal is raised with an increase of the number of welding layer. The maximum position of diffusible hydrogen content in thickness direction exists at just under the last layer and its distribution can be shown as Fig. 5 and Fig. 7. The hydrogen contents of maximum position was raised with an increase of the number of welding layer. (2) Maximum hydrogen contents, above mentioned, is reduced about 30per cent with locally post eating for 0.5hr at 300℃, and diffusible hydrogen is almost removed with furnace annealing for 2hr at 625℃. (3) Diffusible hydrogen remains for a long period in thick weldment, for example, it remains over 60 days in 100mm thick weldment of A 387 Gr D steel (2 1/4Cr-1MO Steel).
社団法人溶接学会の論文
1975-04-05