| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.6 ( September 1982 ) ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Matching Ferritic Filler MIG Welding of 9%Ni Steel
Kazuo Agusa, Masaaki Kosho, Noboru Nishiyama, Akio Kamada, Yoshifumi Nakano |
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Synopsis : A technique for stabilizing pure argon shielded MIG arcs using rare earths-bearing electrode wires has been applied to the matching ferritic filler welding of 9%Ni steel. Investigations have been made on the hot crack susceptibility, mechanical properties and fracture toughness of weld metals. The results of the investigations summarized below have proved the practicability of the matching ferritic filler welding. (1) Hot crack resistivity of ferritic weld metals is far better than that of high-Ni-based weld metals, with no crack occurring even in weld craters. (2) Tensile properties of all-deposited metals and welded joints are equal to those of the base plates, with a rise in the allowable design stress value. (3) Ferritic weld metals obtained with pure argon shielded MIG arcs have excellent low-temperature toughness based on the reduction in silicon and oxygen contents. (4) Matching ferritic welds obtained with pure argon shielded MIG arcs have excellent fracture toughness. |
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