Pulse mig welder for welding thin-walled copper-nickel pipe

Details Pulse mig welder for welding thin-walled copper-nickel pipe Pulse mig welder for welding thin-walled copper-nickel pipe

B - Operations, Transporting

23

K

327/67, 327/71

B23K 9/09 (2006.01) B23K 9/10 (2006.01) B23K 9/12 (2006.01)

Patent

CA 2019428

PULSE MIG WELDER FOR WELDING THIN- WALLED COPPER-NICKEL PIPE Abstract A welding station for welding thin-walled copper- nickel pipe. An electronic welding station (10) has an output circuit (13) which provides arc welding power having the arc characteristics specified by a weld parameter selection circuit (12). A welding torch and feeder assembly (11) has a controller (20) which is responsive to a predetermined event, such as the passage of time since the start of the arc, or the average temperature of the pipe (25) as indicated by two temperature- measuring devices (30, 32). The controller (20) adjusts the wire feed speed, the pulse frequency, the pulse width, the welding voltage, the welding current and/or other parameters so as to cause the arc to have the parameters most desired for welding copper-nickel pipe. The present invention provides for a hotter arc for starting the welding operation, thereby obtaining good penetration and bonding, and a cooler arc for continuing the welding operation, thereby preventing burn- through of the pipe (25).

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