| 摘要 |
A tube welding apparatus for the front face of a tube sheet. The welding apparatus includes a welding head housing from which protrudes a securing mandrel assembly. The mandrel assembly is to be positioned within the tube that is to be welded. The securing mandrel assembly includes a ball assembly which is to be movable to an extended position in tight contact with the interior wall of the tube. The welding electrode is to be selectively mountable in any one of various positions within a welding electrode mounting housing which is located within the welding head housing. The different positions of mounting the electrode physically orient the electrode at slightly different angles with respect to the weld area. Inert gas is to be supplied to the weld area through a gas discharge passage assembly. Included within the welding head housing is a gas diffuser to facilitate even dispursement of the gas about the tip of the welding electrode. A fluid cooling passage assembly is located within the welding head housing for the purpose of eliminating excessive heat. Electrical energy for the welding electrode is conducted through a cable which is located within the interior of the fluid cooling supply conduit. An access door is provided within the welding head housing to gain access to the welding electrode to facilitate changing or repositioning of the electrode.
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