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Pipe automatic root-pass, fill and cap pass welding machine, integrated with updating digital welding control technology, micro-processing technology and other mature welding technologies, with welding process controlled by updating soft ware, can completely realize root-pass, fill and cap pass. It can also realize the transition of heavy current & low melting penetration, and the transition of pulse ejection of SHARP ARC in the welding process, which effectively settles the disadvantages of traditional gas shielded welding technique, such as low melting penetration, incomplete fusion, splashes, low efficiency, and make the gas shielded welding technique reach the rigorous requirements of nuclear grade and high-pressure pipe. This system is equipped with program designed by experts, and thin wire sub-arc function, easy to operate. It is widely suitable for multilayer & multipath high-efficient automatic welding of medium-low, medium-high, high pressure pipes with various materi