A new friction law for the modelling of continuous drive friction welding: applications to 1045 steel welds

摘要

This paper presents the results of a combinedexperimental and numerical study of continuous drive frictionwelding of 1045 steel. A new friction law is proposed for theestimation of the apparent coefficient of friction during directdrive friction welding. The temperature distributions areempirically and numerically predicted in the heat affected zone thatis formed during the direct drive friction welding of 1045 steel to1045 steel. Microstructures of the heat-affected zone are presentedalong with microhardness profiles for the similar and dissimilarwelds. Temperature measurements were made at differentlocations using thermocouples. A finite element model was usedto determine the appropriate coefficient of friction to fit theexperimental data. A multiparameter regression analysis was thenperformed to determine the functional dependence of the frictioncoefficient on process parameters such as temperature, pressure,and sliding velocity. Predictions of the coefficient of friction werein close agreement with the experimental results obtained from thedirect drive friction welding trials on 1045 steel. The currentresults suggest that the new friction law may be used to determinethe effects of friction welding parameterize on friction coefficientsin other materials systems.