Kawasaki Steel Corporation

Other

National Institute for Materials Science

Chiaki Shiga

Akihiko Ohta

Osamu Watanabe

Takahiro Kubo

Kazuo Hiraoka

Satoshi Nishijima

Koji Nakamura

Hideyuki Yamamoto

Keniti Amano

Terumi Nakamura

Yasushi Morikage

Koich Yasuda

Yoshifumi Nakano

Osamu Tanigawa

In the present invention, an iron based alloy which contains by mass %: 0.20% or less of C; 6.0 to 16.0% of Cr; 6.0 to 16.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 0-170&#xb0; C., inclusive of 0&#xb0; C. and exclusive of 170&#xb0; C., is used as a welding material. With respect to a weld metal, the weld metal has a iron alloy composition which contains by mass %: 0.20% or less of C; 3.0 to 13.0% of Cr; 3.0 to 13.0% of Ni and whose martensitic transformation starting temperature (Ms point temperature) is in the range of 50-360&#xb0; C., inclusive of both 50&#xb0; C. and 360&#xb0; C.

Welding material and a method of producing welded joint

A gas having an arc current-voltage property that is different from a shielding gas is intermittently added to the shielding gas, an arc current is intermittently changed in proportion to an intermittent chemical composition change of the shielding gas at an arc generation region, and an arc generation point situated at a tip of a welding wire is displaced upwardly or downwardly along a groove of a base metal.

Consumable electrode gas shielded arc welding method and apparatus

Welding material

A welding method for two members adapted to be welded and formed of a low-alloy steel for structural purposes causing the weld metal to develop martensite transformation during cooling after welding, so that the weld metal becomes expanded to a greater degree at room temperature than at a temperature at which the martensite transformation initiates. The welding material comprises a ferrous alloy containing C, Cr, Ni, Si, Mn, Mo and Nb, all of which meet substantially with the contents of the following equation (1): ##EQU1##

Welding method and welding material

There is provided a low-temperature service nickel steel plate with excellent weld toughness. This steel plate consists essentially of not less than 0.03% of C, 0.02 to 0.22% of Si, 0.05 to 0.47% of Mn, not more than 0.005% of P, not more than 0.005% of S, 7.5 to 12.0% of Ni, 0.01 to 0.10% of Al, and the remaining of Fe, where the following relations stand 3.5%.ltoreq.(8Si+9Mn).ltoreq.5.1% and 123C+(8Si+9Mn).ltoreq.10.9%.

Low-temperature service nickel plate with excellent weld toughness

Growing community of inventors

Tsukuba, Japan

Chiaki Shiga