| Abstract |
The materials response of a laser beam welded joint from hot rolled DP600 steel plate to
the dynamic loading has been experimentally studied by instrumented Charpy impact testing. Based
on the impact force-displacement curve, Critical Crack Length, i.e. CCL and dynamic crack
extension resistance curve, i.e. J-a were determined, describing the welding joint’s crack
formation toughness and the dynamic crack behavior. It is shown that the difference of crack
initiation and propagation between the HAZ and BM is not significant. In addition, the CCL of
Welding Area, i.e. WA is multiple higher than that of HAZ and BM, which is also less dependent of
low temperature. Moreover, the J-a curve of WA consists of two segments, the initial sudden
ascending with linear feature and the subsequent slow rising. Furthermore, tearing module derived
from the slope of J-a curve was discussed, indicating the material microstructure mechanism
affected by the thermodynamic process of laser beam welding. |
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