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Fabricated piston with sprayed groove

  • US 3,914,574 A
  • Filed: 10/01/1973
  • Issued: 10/21/1975
  • Est. Priority Date: 10/01/1973
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a light metal piston having a circumferentially extending piston ring groove, which method comprises the steps of producing a main cylindrical piston part having a reduced diameter portion at its head end, and an annular piston part adapted to fit over said reduced diameter portion, with each of said parts having a lateral surface defining substantially the whole of one side of said piston ring groove when said annular piston part is fitted onto said cylindrical piston part in a predetermined position relative thereto, spraying a wear-resistant coating material onto at least one of said lateral surfaces before said parts are fitted together, and subsequently fitting said parts together in said predetermined position, and electron beam welding them to each other.

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