1999 Volume 17 Issue 1 Pages 24-34
The effect of friction welding condition on initial joining phenomena and mechanism in 1st and 2nd phases of friction welding were investigated with continuous drive type friction welding machine, using mild steel.
The results are as follows ;
1) The initial joining location moved from the axial center part to the outside part of the specimen with the increase of friction pressure, when friction pressure was low. However, its location was constant, when friction pressure was high.
2) The initial joining start time increased with the decrease of friction pressure, when friction pressure was low but its time was not very much change, when friction pressure was high.
3) The location of traces and maximum temperature in faying surface agree with initial joining location.
4) The friction torque values on the 1st and 2nd phases were in proportion to the contact area in faying surface.
5) It was considered that the mechanism of movement of initial joining location by the friction pressure was caused by the movement of the location of plastic deformation with the increase of temperature in faying surface and heat conduction of the axial center part.
