| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.10 ( December1984 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Application of High-Efficiency Submerged-Arc Welding to Circumferential Butt Joint Kohzo Akahide, Hiroaki Furuya, Masahiro Ishida |
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Synopsis : A circumferential SAW technique characterized by a two-electrode system and narrowly grooved joint has been developed. The welding process is applicable to butt joints of large diameter heavy wall steel pipes. The two-electrode SAW technique is especially effective in welding steel pipes of larger than 1000mm diameter and the welding efficiency was experimentally confirmed to be up to about 50% higher than that by the conventional single electrode. In welding a V-groove joint with steel backing, blowholes are apt to occur in the first pass bead and so their cause and countermeasure have been studied. As a result of an application of this new technique to the construction of offshore berth facilities in Taiwan, 40% increase in efficiency was attained in welding steel pipes of 1500mm diameter and thus its high productivity and practicality have been proved. |
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