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Method for welding thermoplastic materials

  • US 5,407,514 A
  • Filed: 07/22/1993
  • Issued: 04/18/1995
  • Est. Priority Date: 02/03/1988
  • Status: Expired due to Term
First Claim
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1. A method of welding adjacent members of a thermoplastic material, comprising the steps of:

  • positioning a thermoplastic welding rod between said adjacent members of said thermoplastic material, which welding rod has a solid core of said thermoplastic material and a resistance element embedded below the outer peripheral surface of said welding rod, which resistance element is distributed in surrounding relationship to said solid core along the lengthwise direction of said rod and is embedded 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;

    applying a current to said resistance element;

    applying pressure to said members such that the facing surfaces of said members are in contact with said welding rod, said current being applied to said resistance element for a time and intensity sufficient to cause said solid core of said welding rod and portions of said members proximate said welding rod to soften and melt; and

    discontinuing said current.

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