Patent ID: 9713854
Date: 2017-07-25
CPC Classifications: B21J,B21K,B23K,B29C,B29L,Y10T

Claim:
1. A method of friction welding a workpiece comprising: positioning a curl forming die proximate first and second parts that are disposed along an axis, the curl forming die including a first die portion and a second die portion that is disposed opposite the first die portion, wherein the first die portion has a first opening that receives the first part, the second die portion has a second opening that receives the second part, and the first and second die portions cooperate to define a cavity; and friction welding the first part to the second part such that a first curl is generated proximate the first part and a second curl is generated proximate the second part, wherein the first curl and the second curl are formed by the curl forming die during friction welding, the cavity receives the first part, the second part, the first curl, and the second curl, and the cavity is disposed further from the axis than the first opening and the second opening.