| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.15 ( October 1986 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Development of High-Quality Narrow Gap Submerged Arc Welding Consumables for Cr-Mo Steel Masaaki Tokuhisa, Yukio Hirai, Noboru Nishiyama, Itaru Yamashita, Kaname Nishio, Katsuaki Nakatsuji |
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Synopsis : In a narrow gap arc welding process with a single-pass-per-layer technique, the toughness of weld metal greatly depends on that of as-dendrite structure. The increase in carbon content and V-addition have beneficial effects on improving the as-dendrite structure toughness by refining the bainitic lath sub-structure and increasing fine carbo-nitrides which have precipitated uniformly within the Α-grains after PWHT. Two types of narrow gap SAW consumables, i.e., the high C-V system for excellent-toughness Cr-Mo steels and high C-V-Ti system for enhanced-strength Cr-Mo steels have been developed on the basis of the above-mentioned metallurgical findings. The realization of a narrow-gap tandem SAW process was confirmed by a production scale mock-up test using the newly developed consumables. |
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