This paper is concerned with a methodology to identify the dynamic material properties of the heataffected
zone (HAZ) near the base metal in a resistance spot weld process at various strain rates. In
order to obtain the dynamic material properties of the HAZ in the spot-welded steel sheet, specimens
are prepared to have similar material properties, hardness and microstructure to the actual HAZ.
Such thermally simulated specimens are fabricated with the material thermal cycle simulator
(MTCS) and compared with the real one for the hardness and microstructure. Dynamic tensile tests
are then conducted with a high speed material testing machine. Stress–strain curves of the thermally
simulated HAZ are obtained at various strain rates ranged from 0.001/sec to 100/sec. Obtained
material properties are applied to the finite element analysis of the spot-welded tensile-shear
specimen in order to verify validity of the proposed testing methodology and obtained results.
Analysis results demonstrate that the material properties obtained are appropriate for the FE analysis
of spot-welded specimens.