Lincoln Global, Inc.

Mcdermott International, Inc.

J. Ray Mcdermott, S.a.

Clyde David Noel

Steven R Peters

Thomas Edward Doyle

Terry Louis Breaux

Michael J Brennan

A method and a system for forming a root pass weld for a root pipe joint. A substantially periodic electric welding waveform is generated and a series of electric arc pulses are generated between an advancing welding electrode and a root pipe joint in response to the electric welding waveform. The electric welding waveform includes a base cycle having a background current phase providing a background current level, a peak current phase providing a peak current level, a tail-out current phase providing a decreasing tail-out current level, and at least one heat-increasing current pulse during the background current phase providing a heat-increasing current level being above the background current level.

Method to improve the characteristics of a root pass pipe weld

A system for automatically tracking a surface for performing a welding operation comprises a frame and pair of ring gears movably mounted to the frame. The ring gears are spaced apart from each other. Three weld heads are movably mounted to each ring gear. Each weld head has a welding torch for providing a weld and a laser scanning device for scanning a surface and for measuring distances over the surface. A control system communicates with the laser scanner for receiving the measured distances and for controlling the movement of the ring gears and the weld heads.

Automatic tracking system for pipeline welding

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Houma, LA, United States of America

Clyde David Noel