Abstract: Provided is a high Cr Ni-based alloy welding wire with which tensile strength and weld cracking resistance of a welded portion, the integrity of the microstructure of a welded metal, and inhibition of scale generation are improved. The high Cr Ni-based alloy welding wire is configured to have an alloy composition comprising, by mass, C: 0.04% or less, Mn: 7% or less, Fe: 1 to 12%, Si: 0.75% or less, Al: 0.01 to 0.7%, Ti: 0.01 to 0.7%, Cr: 25.0 to 31.5%, Ta: 1 to 10%, and Mo: 1 to 6%, and as inevitable impurities, Ca+Mg: less than 0.002%, N: 0.1% or less, P: 0.02% or less, O: 0.01% or less, S: 0.0015% or less, H: 0.0015% or less, Cu: 0.08% or less, and Co: 0.05% or less, and the balance: Ni. Then, the high CrNi-based alloy welding wire is configured such that the contents of S, Ta, Al, and Ti satisfy the following relation (1) and the contents of Ta, Mo, and N satisfy the following relation (2): 12000S+0.58Ta?2.6Al?2Ti£19.3??(1) Ta+1.6Mo+187N35.7??(2).

Abstract: A back-shielded welding method according to the present invention includes communicating a front surface-side and a back surface-side of two welding base materials (2, 3) with each other in the welding base materials (2, 3) that abut against each other; forming notched portions (21, 22) in abutting edge portions (15, 16) of two welding base materials (2, 3) in such a manner that a slit-shaped gas supply opening (17) is formed to extend along a forming direction of a welding bead; forming the gas supply opening (17) with the notched portions (21, 22) by abutting the abutting edge portions (15, 16) of the welding base materials (2, 3) against each other and temporarily fixing the abutting edge portions (15, 16); and forming the welding bead while supplying an inert gas via the gas supply opening (17), and blocking the gas supply opening (17) by the welding bead.

Abstract: A back-shielded welding method according to the present invention includes communicating a front surface-side and a back surface-side of two welding base materials (2, 3) with each other in the welding base materials (2, 3) that abut against each other; forming notched portions (21, 22) in abutting edge portions (15, 16) of two welding base materials (2, 3) in such a manner that a slit-shaped gas supply opening (17) is formed to extend along a forming direction of a welding bead; forming the gas supply opening (17) with the notched portions (21, 22) by abutting the abutting edge portions (15, 16) of the welding base materials (2, 3) against each other and temporarily fixing the abutting edge portions (15, 16); and forming the welding bead while supplying an inert gas via the gas supply opening (17), and blocking the gas supply opening (17) by the welding bead.

Abstract: Provided is a high Cr Ni-based alloy welding wire with which tensile strength and weld cracking resistance of a welded portion, the integrity of the microstructure of a welded metal, and inhibition of scale generation are improved. The high Cr Ni-based alloy welding wire is configured to have an alloy composition comprising, by mass, C: 0.04% or less, Mn: 7% or less, Fe: 1 to 12%, Si: 0.75% or less, Al: 0.01 to 0.7%, Ti: 0.01 to 0.7%, Cr: 25.0 to 31.5%, Ta: 1 to 10%, and Mo: 1 to 6%, and as inevitable impurities, Ca+Mg: less than 0.002%, N: 0.1% or less, P: 0.02% or less, O: 0.01% or less, S: 0.0015% or less, H: 0.0015% or less, Cu: 0.08% or less, and Co: 0.05% or less, and the balance: Ni. Then, the high CrNi-based alloy welding wire is configured such that the contents of S, Ta, Al, and Ti satisfy the following relation (1) and the contents of Ta, Mo, and N satisfy the following relation (2): 12000S+0.58Ta?2.6Al?2Ti£19.3??(1) Ta+1.6Mo+187N35.7??(2).

Abstract: A turbine rotor related to the present invention includes a first member, and a second member joined to the first member, wherein the first and the second members are extended in an axial direction of the turbine rotor, a groove portion for welding is formed at a border between the first and the second members and penetrates the bottom portion of the groove portion, and a gas-introducing hole for introducing inert gas inside the turbine rotor is covered by welding.

Abstract: A welding structure (30A) includes a welding layer (60A) which is configured of a first built-up layer (33) which is formed of low-alloy steel or carbon steel having a carbon content of less than low-alloy steel and which is formed on a base metal (31), a second built-up layer (34) which is formed of a 600-type nickel-based alloy and which is formed on the first built-up layer (33) and a third built-up layer (35) which is formed of a 690-type nickel-based alloy and which is formed on the second built-up layer (34).

Abstract: Disclosed is a welding material for a Ni-based alloy, comprising components expressed as follows: C?0.05 mass %; 8 mass %?Cr?25 mass %; Fe?4.0 mass %; W?15 mass %; 5 mass %?Mo+½(W+Re)?20 mass %; Co?20 mass %; 0.01 mass %?Al<2.0 mass %; 0.01 mass %?Ti<2.0 mass %; Al+½Ti?3.0 mass %; Nb+½Ta?1.5 mass %; B?0.007 mass %; Zr?0.04 mass %; 0.01 mass %?Si?0.5 mass %; Mn?1.0 mass %; P?0.010 mass %; S?0.002 mass %; O?0.005 mass %; and Ni and unavoidable impurities which constitute the balance.

Abstract: The present invention provides a high Cr Ni-based alloy filler material of which weld cracking resistance can sufficiently be increased by suppressing generation of scales, and a welding rod for shielded metal arc welding that exhibits sufficiently increased weld cracking resistance. The high Cr Ni-based alloy filler material comprises, in percent by weight, C: 0.04% or less, Si: 0.01 to 0.5%, Mn: 7% or less, Cr: 28 to 31.5%, Nb: 0.5% or less, Ta: 0.005 to 3.0%, Fe: 7 to 11%, Al: 0.01 to 0.4%, Ti: 0.01 to 0.45%, V: 0.5% or less, and, as inevitable impurities, P: 0.02% or less, S: 0.015% or less, O: 0.01% or less, N: 0.002 to 0.1%, and the balance: Ni.

Abstract: The present invention provides a high Cr Ni-based alloy filler material of which weld cracking resistance can sufficiently be increased by suppressing generation of scales, and a welding rod for shielded metal arc welding that exhibits sufficiently increased weld cracking resistance. The high Cr Ni-based alloy filler material comprises, in percent by weight, C: 0.04% or less, Si: 0.01 to 0.5%, Mn: 7% or less, Cr: 28 to 31.5%, Nb: 0.5% or less, Ta: 0.005 to 3.0%, Fe: 7 to 11%, Al: 0.01 to 0.4%, Ti: 0.01 to 0.45%, V: 0.5% or less, and, as inevitable impurities, P: 0.02% or less, S: 0.015% or less, O: 0.01% or less, N: 0.002 to 0.1%, and the balance: Ni.

Abstract: The known reflecting mirror for a laser beam conisting of a mirror base member and a high-reflectivity metal coating layer formed on the mirror base member for reflecting a laser beam, is improved so as to maintain a high mirror reflectivity without necessitating a cooling facility. The improvements reside in that a coating layer having a small diffusion coefficient is provided on the back surface side of the high-reflectivity metal coating layer, and/or in that at least one layer of dielectric coating layer or layers are provided on the surface of the high reflectivity metal coating layer.