CO_2 Short Arc Weldability of Rare Earth Treated Pipeline Steels in Circumferential Welds
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概要
- 論文の詳細を見る
The CO_2 short arc weldability of rare earth treated steels is investigated. The effect of chemical compositions in steels of 23 heats on arc instability is investigated with the welding condition close to circumferential welding. Experimental results described in terms of Ts (a short circuiting period at one event) are examined by multiple regression analysis, which reveals that Ts depends strongly on rare earths. The arc instability results in step-like defects on a bead in CO_2 welding of steels containing 0.02 % and over of rare earths. The defect is interpreted in terms of the transfer of an excessively large drop generated by extended intervals between short circuitings. To prevent the defect, use of increased welding current, decreased welding speed, and a DCSP source is recommended.
- 社団法人溶接学会の論文
著者
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Sasaki Hiroaki
Welding Section
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AKAHIDE Kozo
Welding Section
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TSUBOI Junichiro
Welding Section, Research Laboratories, Kawasaki Steel Corp.
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Tsuboi Junichiro
Welding Section Research Laboratories Kawasaki Steel Corp.