| 摘要 |
A welding head, to effect welding of cylindrical tubes wherein the head includes a fixed housing and a rotatable housing, a welding electrode contained wherein the rotatable housing, both the fixed housing and rotatable housing having alignable openings through the wall structure of each to permit entry and removal of the tube, passage structure located within both the fixed housing and rotatable housing to continuously supply inert gas to the molten puddle at the welding location, the passage structure effecting continuous application of the gas to the molten puddle during rotational movement of the rotatable housing with respect to the fixed housing.
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