水中におけるプラズマ溶接(第 3 報)

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In underwater wet welding using a plasma arc as a heat source, the process using both water and gas as the shielding materials has been developed as a way to protect the plasma arc and the part being welded from the water environment. In this process, the periphery of the cavity which is formed around the plasma arc with an annular flow of shielding gas is surrounded and restricted with fanwise streams of water. Then, the effects of the process mentioned above and the phenomena following this have been investigated by comparing with those of the process without shielding materials and the process using shielding gas. The experiments have been done at a depth of 20cm in city water. Steel for welded structure (SM 41 A) having a thickness of 12mm has been used as the base metal. Adding the process using viscous liquid as a shielding material to the three processes mentioned above, merits and demerits of each process have been evaluated. Main results are summarized as follows : (1) The process using both water and gas as shielding materials enables the cavity formed around the plasma arc to remain stable. Consequently, the stable plasma arc can be obtained by this process as well as that of the process using viscous liquid. (2) In spite of the fact that water stream has an effect to cool the weld rapidly, the weld produced by this process using both water and gas includes less blowholes and has better appearance than that produced by the process using shielding gas. From the results mentioned above, it is concluded that the process using both water and gas as shielding materials is effective as a wet welding process which is free from water pollution caused by use of shielding materials.
社団法人溶接学会の論文
1974-02-25

水中におけるプラズマ溶接(第 3 報)

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