Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1994-03-17
1995-04-04
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
21913751, B23K 929
Patent
active
054039878
ABSTRACT:
An improved gas shielded welding torch having a head portion adopted to retain a tungsten electrode therein and flexible handle portion which supplies electric current and inert shielding gas to the head portion. The handle portion includes a bendable metal helix of solid wire therein which defines an electrically conductive path through the handle portion and renders the handle portion readily bendable so that the torch head can be positioned in any desired angular orientation with respect thereto to facilitate access to the work area. A torch body of elastomeric insulating material is molded about the helix and adjacent portions of the torch handle. To prevent the elastomeric material from intruding into the bore of the helix during the molding of the insulating body and plugging the gas flow passage defined hereby and from intruding into the spaces between the convulsions in the helix and preventing the individuals convolutions from freely opening and closing during bending of the torch body, the helix is wrapped with sealing tape and is thereby isolated during the molding of the insulating body. The resulting uniform flexibility in the helix uninhibited by intruding insulating material improves the versatility of the torch and avoids repetitive bending in areas of least resistance along the helix, which would otherwise exist in an obstructed coil and cause localized work hardening and premature failure. The sealing tape also defines a second layer of thermal and electrical insulation for the protection of the operator.
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