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Piston and method of manufacture

  • US 7,005,620 B2
  • Filed: 12/12/2003
  • Issued: 02/28/2006
  • Est. Priority Date: 11/04/2003
  • Status: Expired due to Term
First Claim
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1. A method of making a piston, comprising:

  • preparing a first portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another,preparing a second portion of the piston having at least two associated circumferentially extending joining surfaces that are spaced from one another;

    supporting the first and second piston portions with the joining surfaces of the first portion being positioned out of contact with the joining surfaces of the second portion;

    heating the joining surfaces of the first and second portions to an elevated bonding temperature and thereafter bringing the joining surfaces of the first and second portions into contact with one another and thereby forming a metallurgical bond therebetween, wherein the joining surfaces lie in different planes.

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