鋼管の水中全周溶接 : 垂直鋼管の横向き姿勢による全周溶接

概要

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Underwater circular welding of steel pipe which was set vertically was carried out in horizontal position using a water curtain type CO_2/MIG arc welding method, and it was proved that this method was applicable to the underwater circular welding of pipe. (1) For 6.4mm thick steel pipe, I groove was adopted and the appropriate welding conditions to get a full penetration of root and stable bead shape were revealed in relation to a root gap, welding current and welding speed. One pass or two pass welds was excellent in penetration and bead shape all over, and passed the tensile and bending test. (2) For 16mm thick steel pipe, multi-layer welding was carried out with spray and short circuiting arc. So far as the appropriate welding conditions were selected, welding results were excellent both under water depth of 1m and 50m. Mechanical properties of welds were excellent not only in tensile and bending test but also in impact test.
社団法人溶接学会の論文
1979-02-05