Abstract: Friction welding apparatus for substantially automatically welding relatively small diameter workpieces.The apparatus comprises a pair of spaced segmented transfer wheels on a single shaft for retaining workpieces and rotating the same between loading, welding and ejection stations, and a plurality of high-speed motors which carry workpieces at the opposite ends of each rotor, such motors being moveable from a load station through a series of speed-increasing stations to a weld station between the several transfer wheels. Hydraulic means then forces the oppositely disposed transfer wheel segments in their weld stations toward the motor therebetween to simultaneously complete two friction welds. Thereafter, the parts are ejected when the wheel segments move to the ejection stations.

Abstract: A blind fastener wherein a push-pull type setting tool is employed for pulling a stem into a predetermined position relative to a sleeve, and a two element shear washer is provided to fail at a predetermined shear load as created by the compressive load on the sleeve and the reaction tensile pull on the stem. Failure of the shear washer drives a locking collar between the stem and sleeve.The shear washer comprises a pair of concentric but axially offset elements joined together by an annular shear web which, upon shear failure allows one of the elements to drive an annular locking collar between the stem and sleeve. Such shear washer together with the rivet sleeve are serially placed under compression to counteract the tensile force applied to the stem.