On the Torque in Friction Welding
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概要
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The characteristic of torque that a lower rotational speed leads to a higher torque in the third (steady) phase and the torque rises in the fourth (decelerating) phase is investigated by using a transparent acryl resin base material in place of metal. Main results are as follows : (1) The contact face between the base materials consists of two regions, that is, a circular junction region at the centre part and an annular region in which joining and separating repeat violently. (2) The area of the circular junction region depends upon the rotational speed. The higher the rotational speed is, the smaller the area becomes. (3) The phenomenon that the torque in the third phase becomes lower in the case where a higher rotational speed is selected, is related to the smaller area of the junction region. (4) As the rotational speed lowers in the fourth (decelerating) phase, the area of the junction region extends gradually over the interface. Thus the extending junction region enhances the friction torque and it has a leading effect to characterize the history of torque in friction welding.
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