Abstract
Underwater welding was experimentally carried out in a water box by coated electrodes and semiautomatic CO2 welding. And It was investigated the occurrence of blowhole was affected by various welding parameters.The following results were obtained:1) Sound deposited metal and welded joints were obtained under flat, horizontal and vertical positions from every coated electrode except the low hydrogen type one. Kinds of power sources and water proofing coatings of electrodes had no special effect on appearance and soundness of bead.2) Welded joints by coated electrodes were superior in tensile strength but inferior in ductility to the mild steel base metal.3) It was difficult to get a sound weld metal by low hydrogen type electrode under water. Blowholes in weld metal were remarkable in all welding current and arc voltage ranges.4) It was also considerably difficult to obtain a weld metal quite free from blowholes by underwater semiautomatic CO2 welding.
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