| 摘要 |
A quickly exchangeable cartridge unit for automatic or semiautomatic welder machines, e.g., for welding, especially large diameter pipelines and the like, includes a small unit frame capable of being instantly attached to or detached from a carrier. The small frame includes means for holding electrode wire supply, a wire drive, and a welding head. The unit is designed particularly for travel, e.g., in an orbital path around the inner surface, forming a girth joint between abutted annular members but can be used also for external welding or in automatic plate welding, etc.
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