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US 5,407,520 AGranted
Welding rod
AssigneeE. O. Butts Consultants Ltd.
InventorsErnest O. Butts, Nicholas E. Butts, Robert Pinder
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AssigneeE. O. Butts Consultants Ltd.
InventorsErnest O. Butts, Nicholas E. Butts, Robert Pinder
Estimating the term…
An improved welding rod having a solid homogeneous core of thermoplastic material and a resistance element comprised of a plurality of wires is presented with a method and apparatus for forming the welding rod. The welding rod is positioned between members of the thermoplastic material to be welded and a current and pressure is applied to the resistance element causing the thermoplastic material of the solid core and the adjacent thermoplastic members to fuse and form a unitary weld. Simultaneously the electrical resistance element is embedded in the weld, mechanically reinforcing and strengthening the connection. There is also disclosed a method for electric fusion welding of thermoplastic members wherein the welding rod is pre-attached to one of the thermoplastic members.
A welding rod for welding adjacent members of thermoplastic material, comprising a solid homogeneous core of thermoplastic material and a resistance element enveloping said core and embedded in said rod just below a thin thermoplastic surface layer of said rod, wherein said resistance element comprises a wire helically wound in a surrounding relationship about said core in the lengthwise direction of said rod, and wherein said resistance element is embedded in said rod below the surface of said rod a sufficient depth such that burning of said thermoplastic during welding is substantially prevented when a welding current is applied to the resistance element, but not so deep that burning of the thermoplastic material of the core occurs prior to softening of portions of the adjacent members nearest the welding rod.
A double electric welding rod for welding adjacent members of thermoplastic material comprising:
Dependencies are inferred from the claim text.