Studies on Friction Welding (Report 1)

Effects of upsetting time on properties of friction welds

Abstract

It is generally said that the sudden stop of spindle and the instantaneous upsetting are both the important processes in the final phase of friction welding. However, there is no paper on upsetting time.
Thereupon, welding was carried out to investigate the effects of upsetting time on strength of friction welded joint. In this experiment, 0.45 and 0.25 per cent carbon steel rods were used as specimens. The welding conditions were kept constant, except that the upsetting time relating to stop time of spindle was varied. Effects of upsetting time on properties of joints were judged by roller bend test.
The results are as follows;
(1) In order to get a satisfactorily welded joint, it is desirable to so adjust as to start the upsetting process just before the spindle is stopped.
(2) Even under improper welding condition in previous experiments, in which upsetting time was not so controlled, a satisfactorily welded joint was obtained by adjusting the upsetting time to the abovementioned state.