On Underwater Submerged-Arc Welding (The 1st Report) : The Feasibility of Underwater Welding by Submerged-Arc Welding Process

概要

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Feasibility of underwater welding by submerged arc welding process has been studied. The wire US36 and the flux MF43, which has been mixed with 40% water glass, were used. The base metal was steel for welded structure SM41 having a thickness of 9 mm. Main results are summarized as follows : (1) By using the 40% water glass mixed flux and selecting suitable welding condition, a stable welding arc can be kept under water. Then a good weld without undercut can be obtained. However, even when welding is done under the condition, which seem to be suitable, blowholes are formed in the weld metal. (2) Heat insulating effect of flux for the weld zone is significant and cooling rate of the underwater weld by this process is considerably lower than those by the other processes. (3) Average hardness of the underwater weld metal is about Hv160, and that of the heat-affected zone about Hv220. So a remarkably hardened zone cannot be found in the weld. (4) The joint efficiency of the batt weld made by this process is 82%. The elongation of the underwater weld is less than that of base metal.
社団法人溶接学会の論文
1980-04-01