A welding method for joining a first plate made of a material other than steel and a second plate made of steel includes a step of making a hole through each of the first plate and the second plate, a press-fitting step, an overlapping step, and a filling and welding step. A shaft portion of a joining assist member being solid, being made of steel, and having an outer shape with step having the shaft portion and a flange portion is press-fitted in the hole of the first plate. The first plate and the second plate is overlapped such that the shaft portion faces the hole of the second plate. The hole of the second plate is filled with a weld metal and the second plate and the joining assist member are welded.

A welding method for joining a first plate made of a material other than steel and a second plate made of steel includes a step of making a hole through each of the first plate and the second plate, a press-fitting step, an overlapping step, and a filling and welding step. A shaft portion of a joining assist member being solid, being made of steel, and having an outer shape with step having the shaft portion and a flange portion is press-fitted in the hole of the first plate. The first plate and the second plate is overlapped such that the shaft portion faces the hole of the second plate. The hole of the second plate is filled with a weld metal and the second plate and the joining assist member are welded.

In one embodiment, a welding system having a welding power supply configured to provide welding power is provided. The welding system additionally includes a weld cable coupled to the welding power supply and configured to transmit the welding power. The welding system further includes a processor configured to transmit and to receive a plurality of tones to provide communications with a device external to the welding power supply via the weld cable.

In one embodiment, a welding system having a welding power supply configured to provide welding power is provided. The welding system additionally includes a weld cable coupled to the welding power supply and configured to transmit the welding power. The welding system further includes a processor configured to transmit and to receive a plurality of tones to provide communications with a device external to the welding power supply via the weld cable.

A welding method includes providing a first connector having a first end, providing a second connector having a second end for being welded to the first end, overlapping the first end and the second end, applying a contactless heating to a central section of the first end and melting an end section of the first end facing the second connector, and cooling the first end and the second end to form a weld connecting the first connector and the second connector. The first connector and the second connector extend in opposite directions from the weld.

A TIG-type method for tack welding two metal sheets or parts, such as tubes. The method includes, for each zone/point of tack welding of the metal sheets or of the tubes, a tack welding cycle including successively applying at least one smooth or pulsed direct current DC, and then at least one smooth or pulsed alternating current AC.

A TIG-type method for tack welding two metal sheets or parts, such as tubes. The method includes, for each zone/point of tack welding of the metal sheets or of the tubes, a tack welding cycle including successively applying at least one smooth or pulsed direct current DC, and then at least one smooth or pulsed alternating current AC.

A welding torch that comprises: a main body that is formed as a hollow pipe body, and that has a first inclined surface formed inside the pipe body; an electrode bar cap that has a collet chuck on the front side of a joint that is assembled on one side of the pipe body in a screw-coupling manner, that moves the collet chuck by tightening or loosening the joint; a head that has a socket that is arranged on a side facing the pipe body and that sprays supplied gas in all directions, and that is formed of a nozzle that is assembled on an external surface of the socket; and a connector that guides a gas supply into the pipe body.

A welding torch that comprises: a main body that is formed as a hollow pipe body, and that has a first inclined surface formed inside the pipe body; an electrode bar cap that has a collet chuck on the front side of a joint that is assembled on one side of the pipe body in a screw-coupling manner, that moves the collet chuck by tightening or loosening the joint; a head that has a socket that is arranged on a side facing the pipe body and that sprays supplied gas in all directions, and that is formed of a nozzle that is assembled on an external surface of the socket; and a connector that guides a gas supply into the pipe body.

A hardfacing metal composition and method of restoring worn work string tubing by application of a hardfacing metal to the worn regions of the work string tubing.