US PATENT SUBCLASS 219 / 125.11
.~.~.~ For closed path welding (e.g., circumferential welding)

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
125.1  DF  .~.~ With predetermined welding operation {3}
125.11.~.~.~ For closed path welding (e.g., circumferential welding)

DEFINITION

Classification: 219/125.11

For closed path welding (e.g., circumferential welding):

(under subclass 125.1) Subject matter wherein during a continuous welding operation, the welder returns at least once to a point in the previously welded path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

60.2, for annular arc butt welding of heat exchange tubes to a perforated plate.