Dynamic Model for Electrode Expansion in Resistance Spot Welding Machines

Shah, SyedAsadUllah; Chang, HeeSeok

Journal of KWJS 2011;29(2):94-101.
Published online May 7, 2011.

저항점 용접에서 전극팽창에 관한 동적모델

Dynamic Model for Electrode Expansion in Resistance Spot Welding Machines

Abstract

A lumped?mass damped vibratory model was proposed for quantitative understanding of welding machine characteristics. An experimental setup was developed to determine the mechanical parameters (moving mass m, equivalent stiffness k and damping c) which govern the dynamic mechanical response of the resistance spot welding machine. During the test, acceleration of the electrodes for each level of applied load was measured by accelerometer, filtered and numerically integrated to find the corresponding velocity and displacement. The machine dynamic parameters were determined by finding the unknowns of the proposed model with experimental data.
A Simulink model was proposed to investigate the influence of these mechanical parameters on the welding process. The electrode response was simulated by changing values of stiffness and damping. It was observed that both of the machine parameters(c, k) have significant effect on the response of electrode head.

Key Words: Resistance spot welding, Electrode head movement, Accelerometer, Welding machine dynamics