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The narrow-gap torch was designed to promote positive fusion of weld-joint side walls in heavy-wall pipe and vessel welds, with less heat input and quicker weld times than conventional equipment now being used. This torch uses a rotating tungsten, which provides mechanical manipulation of the arc and wire feed within the groove. The integral gas cup provides direct gas shielding of the tungsten and the weld metal. This combination, in conjunction with narrow preps, allows deposition rates that are higher than conventional cold-wire GTAW. Current weld preps being used are approximately 1/2" wide, in the root area, with a 3 to 9 degree included angle for welds up to 4" thick. The clean, compact torch design simplifies process operation so that no special training is required for operators familiar with AMI orbital pipe welding equipment.
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