An electric resistance welded steel pipe which has sufficient strength and low-temperature toughness and a low yield ratio and which is suitable as a line pipe to be laid in depths of the sea, characterized in that: the composition of the base material contains, in mass %, 0.05 to 0.10% of C, 1.00 to 1.60% of Mn, and 0.005 to less than 0.035% of Nb, and has a Ceq value of 0.23 to 0.38; and the metal microstructure of the base material contains 3 to 13% of martensite in area fraction with the balance being ferrite.

A soldered product manufacturing device 1 includes a stage 13 on which a substrate W is placed, solder being arranged on the substrate W; a cover 16 configured to cover at least an upper part of the substrate W placed on the stage 13 at a predetermined distance therefrom; a chamber 11 configured to house the stage 13 and the cover 16; a heater 15 configured to heat the substrate W on the stage 13; and a reducing gas supply device 19 configured to supply a reducing gas F. A method for manufacturing a soldered product includes, by using the soldered product manufacturing device 1, placing the substrate W on the stage 13; covering the substrate W placed on the stage 13 with the cover 16; heating the substrate W; and supplying the reducing gas F into the chamber 11.

Apparatuses, systems, and/or methods for reducing or eliminating gas surges in welding applications are disclosed. The welding system can include, for example, a welding cable coupled to a welding torch in which the welding torch, for example, includes a gas surge protector. The gas surge protector is in flow communication with a gas tube that runs at least partially through the welding cable and provides shielding gas for welding applications. The gas surge protector eliminates gas surges and stabilizes gas flow.

Apparatuses, systems, and/or methods for reducing or eliminating gas surges in welding applications are disclosed. The welding system can include, for example, a welding cable coupled to a welding torch in which the welding torch, for example, includes a gas surge protector. The gas surge protector is in flow communication with a gas tube that runs at least partially through the welding cable and provides shielding gas for welding applications. The gas surge protector eliminates gas surges and stabilizes gas flow.

Provided is an arc welding control method for performing control in an arc period, the control including: first control of increasing welding current (Ia) to first current value (I1) in a range from 200 A to 300 A inclusive at first gradient (S1) and maintaining welding current (Ia) at first current value (I1) for first period (T1); second control of reducing welding current (Ia) from first current value (I1) to second current value (I2) at second gradient (S2) and maintaining welding current (Ia) at second current value (I2) for second period (T2); third control of increasing welding current (Ia) from second current value (I2) to third current value (I3) higher than first current value (I1) at third gradient (S3); and fourth control that is started to reduce welding current (Ia) from third current value (I3) within 0.5 ms after welding current (Ia) reaches third current value (I3) under the third control.

Provided is an arc welding control method for performing control in an arc period, the control including: first control of increasing welding current (Ia) to first current value (I1) in a range from 200 A to 300 A inclusive at first gradient (S1) and maintaining welding current (Ia) at first current value (I1) for first period (T1); second control of reducing welding current (Ia) from first current value (I1) to second current value (I2) at second gradient (S2) and maintaining welding current (Ia) at second current value (I2) for second period (T2); third control of increasing welding current (Ia) from second current value (I2) to third current value (I3) higher than first current value (I1) at third gradient (S3); and fourth control that is started to reduce welding current (Ia) from third current value (I3) within 0.5 ms after welding current (Ia) reaches third current value (I3) under the third control.

A composition for welding or brazing aluminum comprises silicon (Si) and magnesium (Mg) along with aluminum in an alloy suitable for use in welding and brazing. The Si content may vary between approximately 4.7 and 10.9 wt %, and the Mg content may vary between approximately 0.20 wt % and 0.50 wt %. The alloy is well suited for operations in which little or no dilution from the base metal affects the Si and/or Mg content of the filler metal. The Si content promotes fluidity and avoids stress concentrations and cracking The Mg content provides enhanced strength. Resulting joints may have a strength at least equal to that of the base metal with little or no dilution (e.g., draw of Mg). The joints may be both heat treated and artificially aged or naturally aged.

In order to reduce the accumulation of moisture on a welding wire (2, 2′, 2″) arranged in a welding wire cartridge (1, 1a, 1b) or to remove existing moisture in a simple and reliable manner, it is provided that a flow (D.sub.1) of purging air supplied to the welding wire cartridge (1, 1a, 1b) is adjusted by a flow control unit (14), the purging air is supplied to the flow control unit (14) at a first pressure (p) and is discharged at a purging air discharge (24) of the welding wire cartridge (1, 1a, 1b) at a third pressure (p.sub.at), and at a purging air feed (15) of the welding wire cartridge (1, 1a, 1b) a second pressure (p.sub.1) at the purging air feed (15) that is lower than the first pressure (p) results from the adjusted flow (D.sub.1), the third flow (p.sub.at) and a flow resistance between the purging air feed (15) and the purging air discharge (24), the relative humidity (rF.sub.1) of the purging air being reduced by the relief of pressure from the first pressure (p) to the second pressure (p.sub.1).

In order to reduce the accumulation of moisture on a welding wire (2, 2′, 2″) arranged in a welding wire cartridge (1, 1a, 1b) or to remove existing moisture in a simple and reliable manner, it is provided that a flow (D.sub.1) of purging air supplied to the welding wire cartridge (1, 1a, 1b) is adjusted by a flow control unit (14), the purging air is supplied to the flow control unit (14) at a first pressure (p) and is discharged at a purging air discharge (24) of the welding wire cartridge (1, 1a, 1b) at a third pressure (p.sub.at), and at a purging air feed (15) of the welding wire cartridge (1, 1a, 1b) a second pressure (p.sub.1) at the purging air feed (15) that is lower than the first pressure (p) results from the adjusted flow (D.sub.1), the third flow (p.sub.at) and a flow resistance between the purging air feed (15) and the purging air discharge (24), the relative humidity (rF.sub.1) of the purging air being reduced by the relief of pressure from the first pressure (p) to the second pressure (p.sub.1).

A method of welding including: applying a flux having at least a majority weight percent boron to a surface of a superalloy base material; forming a weldment on the surface wherein boron is melted onto the surface and is incorporated into a resulting weld pool and heat affected zone, and wherein incipient melted inter-dendritic material resulting from presence of the boron is available to flow into a crack formed during cooling of the weldment; and heat treating the weldment to diffuse a remaining concentration of the boron in the weldment and heat affected zone to a desired value.