Method of welding the ends of pipe together using dual welding wires
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United States of America Patent
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-
Nov 9, 1999
Issued Date -
N/A
app pub date -
Sep 25, 1997
filing date -
Aug 11, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A new system for welding sections of pipe together to form a long, continuous pipeline. A welding bug is mounted on a guide track which goes around the circumference of the pipe. The welding bug is provided with a wire feeder, a motor to drive the wire feeder, and driving motor for driving the bug around the track. One may vary the speed of the bug and the wire feeder while the bug is continuously driven around the track. The welding head on the welding bug is powered by a surface-tension-transfer power source. The initial or root pass is made external of the pipe. In one embodiment there is a dual welding wire feeder for driving two welding wires simultaneously at the same speed.
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