局部乾式水中溶接部の継手性能とその水中熱処理法による改善に関する研究

概要

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The authors have carried out the evaluation and improvement of the mechanical properties of the "Locally Drying Underwater Welding" joint. The results are summarized as follows : 1. The effect of welding conditions on the cooling characteristic of the welded joints is basically equal to that of the bead welds. The joint by low current-low speed welding condition has a hardness distribution close to that of the air weld, and has good mechanical properties with respect to elongation, reduction of area, charpy absorbed energy, etc. 2. The range of temperature which the slow crack preceded the brittle fracture occurred in the underwater welds in the three-points bend COD test is -85℃ to -75℃. Therefore, with underwater environment taken into account, there is little possibility of brittle fracture in these welds. 3. To improve the mechanical property of underwater weld joint, the possibility of induction heating in water has been studied, and it has been shown that the weld can be heated up to 650℃ by this heat treatment, and the mechanical properties of the weld have improved nearly up to that of the air weld.
社団法人溶接学会の論文
1982-02-05