Study on the Friction Welding of Different Diameter Bars (Report 2)

Effect of the Protrusion from Larger Diameter Bar on the Friction Welding Phenomenon of Different Diameter Bars

Abstract

Joint design of different diameter bar friction welding is important for reliability of joint performance and cost saving. And protrusion part from larger diameter bar, that diameter is the same as smaller one, is often prepared because proper friction welding parameter is said to be widened.
In this study, the effect of the protrusion on the friction welding behaviour was investigated.
The results obtained are as follows:
(1) The friction welding phenomenon of different diameter bar with protrusion remarkably depends on friction pressure, but not so on friction speed.
(2) When higher friction pressure was used, similar friction welding phenomenon as the same diameter bar welding was observed until collar from protrusion was restricted by larger diameter part, then burn-off rate decreased and temperature of friction surface rose. And phenomenon was close to that of different diameter without protrusion.
(3) When lower friction pressure was used, obvious change of phenomenon during friction welding was not observed.