Gas-less process and system for girth welding in high...

Details Gas-less process and system for girth welding in high... Gas-less process and system for girth welding in high...

B - Operations, Transporting

23

K

B23K 9/09 (2006.01) B23K 9/00 (2006.01) B23K 9/095 (2006.01)

Patent

CA 2553062

A welding system and method is disclosed for girth welding high strength materials using a short arc welding process and a self-shielding electrode. The welding system contains a welding apparatus which advances the self-shielding electrode towards a workpiece to be welded and controls the arc length and the operation of the apparatus so that the weld satisfies the requirements for welding at least American Petroleum Institute Grade X-80 line pipe. The system additionally contains a power source with a controller for creating a current pulse introducing energy into the electrode to melt the end of the self-shielding electrode and a low current quiescent metal transfer section following the end of the melting pulse during which the melted electrode short circuits against the workpiece.

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