Anti-friction Property Research Articles

1. The resistance to cold welding or seizing which is characterized by the mean punch pressure at which a strong bond is achieved, depends on the alloy content of the solid solution (Fig. 3). The increase in the seizing resistance is proportional to the strengthening owing to alloying (cf. Fig. 2). 2. The ratio of cold welding pressure of any alloy to its hardness as-annealed is constant and about 1.5. For alloys containing higher concentrations of alloying elements and showing a high strainhardening rate, this ratio is slightly over 2 (Fig. 4, broken line). For pure plastic metals, this ratio as determined by the samethod likewise is 1.5 [8]. 3. The extra pressure needed for cold welding per at-% of the alloying element determines the specific cold welding pressure for each alloy which depends on the solubility limit. 4. The fact that the welding pressure/hardness ratio determined in this study for metals and alloys at different deformations required as for cold welding is constant shows that the deformation of the compressed metals along their interface can be very approximately described by the strain magnitude arbitrarily calculated as the ratio of initial to final thickness of the specimens. 5. Transfer of metal and the degree of surface damage during, rubbing are governed by the shear strength of the weld centers formed. The heat developed and the pi tion afforded by oil or other films are here important. For this reason a true picture of the transfer of metal during friction can be obtained only from experiments with the lubricant to be actually used in service in the particular antifriction application.