A Method for Identifying the Mechanical Parameters in Resistance Spot Welding Machines

Mechanical dynamic responses of resistance welding machine have a significant influence on weld quality and electrode service life, it must be considered when the real welding production is carried out or the welding process is stimulated. The mathematical models for characterizing the mechanical dynamic responses are normally a few coupled differential equations which can be easily created according to the theories of kinematics and dynamics, however the problem is that the parameters contained in the equations are unavailable and hard to be determined directly due to the complexities and differences of machine constructions. In this paper, a method of identifying the machine mechanical parameters based on measured data is presented, which is independent on the construction and the type of machines. The computations are implemented in MATLAB.