US PATENT SUBCLASS 219 / 60.2
.~.~.~ Tube sheet welding

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

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
59.1  DF  .~ Of cylinders (e.g., pipes and tubes) {14}
60 R  DF  .~.~ Electric arc {3}
60.2.~.~.~ Tube sheet welding

DEFINITION

Classification: 219/60.2

Tube sheet welding:

(under subclass 60) Subject matter wherein heat exchange tubes are arc butt welded to a perforated plate.