The patented STT® is a modified GMAW short circuit welding process, designed for open root welding. This unique process simplifies open root welding, requiring less operator experience to implement. STT® is a proven pipeline process, produces excellent quality welds, and improves productivity over more traditional SMAW & GTAW root welding.. The STT process: produces a low hydrogen weld metal deposit in open root joints with easier operation, better back beads, better sidewall fusion and less spatter and fumes than other processes. STT differs from the traditional GMAW short-arc welding process because the arc current is precisely controlled independently from the wire feed speed.
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The STT™ Pipe Root Pass Weld Process Guide outlines the STT™ welding process, which is designed for open root welding and is faster and requires less skill than traditional methods. It includes detailed sections on process description, waveform optimization, applications, setup, troubleshooting, and a glossary of technical terms. The guide emphasizes the efficiency and quality of welds.. For instance surface tension transfer (STT) is a GMAW process, and high frequency welding, (HFW), induction welding, seam welding, spot welding, and projection welding are all variants of electric resistance welding (RW). Argon arc welding and heli-arc welding are types of GTAW process.
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