摩擦圧接の加熱過程について(半自動アーク溶接特集)

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It is well-known that the lower the speed of rotation is, the higher the rate of burn off becomes in heating phase under steady state in continuous drive friction welding. This report deals with the effect of welding parameters on the rate of burn off in heating phase. In order to analyze the effect, the axial compressive strain rate of the lead disc, selected as a model of the zone of workpieces being deformed, is investigated. Furthermore, the improvement in the quality of welds is discussed on the basis of the fact that the amount of burn off is increased with the friction torque in the braking time. The results of experiments may be summarized as follows : 1) When a higher heating pressure and/or a lower rotational speed is used, the rate of burn off becomes higher. 2) In the above-mentioned case, the friction torque becomes higher and the zone being deformed becomes thinner. 3) Under the same heating pressure, the rate of burn off per unit thickness of zone being deformed ν_h increases straightly with an increase of the friction torque. The gradient of the straight line showing the relation between them becomes steeper with an increase of the heating pressure. 4) From the results of the compression-torsion test of the lead disc, it becomes evident that the axial compressive strain rate of the disc becomes higher as the axial load and/or the torsional moment increases and the ratio of the diameter to the thickness of the disc D/l decreases. 5) Based on the results of the test by the lead disc, the factors, which increase the rate of burn off V_h a ta lower rotational speed, are considered as follows. The friction torque contributes largely to the increase of V_h, whereas the decrease of the thickness of the zone being deformed and the decrease of the axial compressive strain rate dependent on D/l do not so much. 6) The quality of welds is improved by the increment of the amount of burn off, which depends on ν_h, raised by the increased friction torque in braking time. It is estimated that the increment of the amount of burn off has the same effect as upsetting at the end of heating phase.
社団法人溶接学会の論文
1972-09-25

摩擦圧接の加熱過程について(半自動アーク溶接特集)

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