Abstract: A coating device includes a backup roll configured to transport a workpiece; a coating die configured to discharge a coating liquid onto the workpiece; a drive section capable configured to drive the backup roll; and a heat dissipation section configured to dissipate heat generated in the drive section.

Abstract: In each of roller groups, multiple straightening rollers include a first roller, a second roller, . . . , an n-th roller in this order in a direction in which a welding wire passes through, and the n rollers (n is an integer of 4 or more) bend the welding wire alternately in opposite directions and straighten a curl of the welding wire. The n rollers are arranged such that an entrance wire deformation amount ?in calculated by using a numerical formula of ?in={2t(?in+t)/ Lin2}×100 ranges from 0.6 to 1.0 (%), and an exit wire deformation amount tout calculated by using a numerical formula of ?out=2t(?out+t)/Lout2}×100 ranges from 0.0 to 0.3 (%) . Diameters 2r of the multiple straightening rollers are 20 mm or less. An arrangement interval L of the multiple straightening rollers is 11.5 mm or more.

Abstract: Disclosed herein is an arc welding method including arc welding a steel sheet by a pulse control method, wherein: welding is performed using a welding wire and a gas containing Ar at a voltage pulse frequency of 50 Hz or more and 200 Hz or less and a voltage pulse width of 1.5 ms or more and 10 ms or less; and the welding wire contains C and further contains, in mass %: Si: 0.2% or more and 1.1% or less; Mn: 0.2% or more and 1.4% or less; and S: 0.010% or more and 0.050% or less, with the balance being Fe and inevitable impurities.

Abstract: Disclosed herein is an arc welding method including welding a steel sheet while controlling feeding of a welding wire in a moving direction. Welding is performed using the welding wire and a gas containing Ar at a frequency of 35 Hz or more and 160 Hz or less in the moving 15 direction of the welding wire. The welding wire contains C and further contains, in mass %, Si: 0.2% or more and 1.3% or less, Mn: 0.2% or more and 1.5% or less, and S: 0.01% or more and 0.05% or less, with the balance being Fe and inevitable impurities.

Abstract: A pure Ar-MIG welding wire for welding steel according to the present invention is formed of a flux-cored wire. The flux-cored wire is formed in the manner that a formation formed by welding a carbon steel hoop into a pipe shape or a seamless pipe is used as an outer sheath, the outer sheath is filled with a flux, and a wire drawing process is performed. The flux accounts for 7 to 27 mass % of the total wire mass. The wire contains graphite in the amount of 0.16 to 2.00 mass % on the basis of the total wire mass and iron powder in the amount of 20 mass % on the basis of the total flux mass. According to the construction, neither expensive metal resource nor a greenhouse effect gas is used, slag and fume generation is inhibited, and a weld joint having a high static tensile strength and fatigue strength can be obtained.

Abstract: A solid wire contains in mass percent C 0.005 to 0.080%, Si 0.30 to 1.20%, Mn 1.15 to 1.65%, S 0.050 to 0.200%, P 0.017% or less, O 0.0070% or less, and N 0.0050% or less, wherein C+(P*5)?0.135 mass percent is satisfied, and the remainder includes Fe and impurities, and the content of each of Ti, B, Cr, Ni, Nb, V, Zr, La and Ce as the impurities is controlled to be a certain content or less, and the amount of adhered oil on a surface of the relevant solid wire is controlled to be 1.2 g or less per wire of 10 kg. According to such a configuration, while increase in welding cost is controlled to the minimum, stability of wire feed, burn-through resistance, undercut resistance, and crack resistance becomes excellent, slag and spatter becomes hard to be generated, hardness of weld metal becomes equal to or higher than that of base metal, and brittle fracture becomes hard to occur.

Abstract: A solid wire contains C of 0.020 to 0.100 mass percent, Si of 0.25 to 1.10 mass percent, Mn of 1.20 to 1.65 mass percent, P of 0.008 to 0.017 mass percent, S of 0.045 to 0.150 mass percent, O of 0.0050 mass percent or less, N of 0.0050 mass percent or less, wherein P*(O+N)*105?15 is satisfied, and the remainder including Fe and impurities, wherein the relevant impurities contain Ti of 0.15 mass percent or less, B of 0.0050 mass percent or less, and Cr, Ni, Al, Nb, V, Zr, La and Ce of 0.20 mass percent or less respectively. According to such a configuration, a solid wire is provided, in which while increase in welding cost is controlled to the minimum, stability of wire feed, burn-through resistance, undercut resistance, and crack resistance are excellent, slag and spatter are hardly produced, hardness of weld metal is equal to or higher than that of base metal, and brittle fracture hardly occurs.

Abstract: A pure Ar-MIG welding wire for welding steel according to the present invention is formed of a flux-cored wire. The flux-cored wire is formed in the manner that a formation formed by welding a carbon steel hoop into a pipe shape or a seamless pipe is used as an outer sheath, the outer sheath is filled with a flux, and a wire drawing process is performed. The flux accounts for 7 to 27 mass % of the total wire mass. The wire contains graphite in the amount of 0.16 to 2.00 mass % on the basis of the total wire mass and iron powder in the amount of 20 mass % on the basis of the total flux mass. According to the construction, neither expensive metal resource nor a greenhouse effect gas is used, slag and fume generation is inhibited, and a weld joint having a high static tensile strength and fatigue strength can be obtained.

Abstract: A solid wire contains in mass percent C 0.005 to 0.080%, Si 0.30 to 1.20%, Mn 1.15 to 1.65%, S 0.050 to 0.200%, P 0.017% or less, O 0.0070% or less, and N 0.0050% or less, wherein C+(P*5)?0.135 mass percent is satisfied, and the remainder includes Fe and impurities, and the content of each of Ti, B, Cr, Ni, Nb, V, Zr, La and Ce as the impurities is controlled to be a certain content or less, and the amount of adhered oil on a surface of the relevant solid wire is controlled to be 1.2 g or less per wire of 10 kg. According to such a configuration, while increase in welding cost is controlled to the minimum, stability of wire feed, burn-through resistance, undercut resistance, and crack resistance becomes excellent, slag and spatter becomes hard to be generated, hardness of weld metal becomes equal to or higher than that of base metal, and brittle fracture becomes hard to occur.

Abstract: A gas-shielded arc welding method uses a shielding gas and a solid wire for pulsation welding. The solid wire contains S, Si, Mn, C and P in predetermined S, Si, Mn, C and P contents, and other elements including Fe and unavoidable elements. A pulsating current used for pulsation welding has a peak current Ip of 350 A or above and a pulse peak duration Tp between 0.5 and 2.0 ms. The shielding gas is a mixed gas containing 75 to 98% by volume Ar and others including at least either of CO2 and O2. The gas-shielded arc welding method can suppress the generation of spatters regardless of welding speed even if the welding speed is high, and can form a wide, flat bead having uniform toes. A weld metal produced by the gas-shielded arc welding method is resistant to cracking and excellent in preventing the formation of blowholes.

Abstract: A solid wire contains C of 0.020 to 0.100 mass percent, Si of 0.25 to 1.10 mass percent, Mn of 1.20 to 1.65 mass percent, P of 0.008 to 0.017 mass percent, S of 0.045 to 0.150 mass percent, O of 0.0050 mass percent or less, N of 0.0050 mass percent or less, wherein P*(O+N)*105?15 is satisfied, and the remainder including Fe and impurities, wherein the relevant impurities contain Ti of 0.15 mass percent or less, B of 0.0050 mass percent or less, and Cr, Ni, Al, Nb, V, Zr, La and Ce of 0.20 mass percent or less respectively. According to such a configuration, a solid wire is provided, in which while increase in welding cost is controlled to the minimum, stability of wire feed, burn-through resistance, undercut resistance, and crack resistance are excellent, slag and spatter are hardly produced, hardness of weld metal is equal to or higher than that of base metal, and brittle fracture hardly occurs.