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This tube to tubesheet orbital welding uses one-button operation to quickly position the welding gun, which is suitable for various welding forms such as tube extension, tube flushing, and tube shrinkage. It can be self-melting or wire-filling, suitable for welding materials such as carbon steel and stainless steel, and the overall structure design is compact. The hanger is suspended and fixed, with flexible working space and a wide range.