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Tack welder supplied by SunYo uses CNC control system and electro-hydraulic servo system. It continuously closes and preliminarily welds the JCO formed pipe. In the jointing process, it can real-timely correct the unfitness of butt joint and adjust the distance of jointing gap, in according with the error detected by the laser tracing system. The machine has the functions of auto-feeding, continuously welding, etc.