Welded structures subjected to fatigue loads-1
However, once a fatigue crack has started, it will grow at the same speed in practi-
cally all grades of steel. Welding (or gas cutting) of a material destroys the microstruc-
ture and introduces so many discontinuities that the entire initiation phase can be
regarded as having been passed. All that remains is the propagation phase, followed by
the final failure.
As the propagation phase is the same for all types of steel, and as the final failure
phase has only marginal importance, it can be shown that the lifetime of the structure is
independent of the fatigue strength of the material - that is, in areas affected by the weld.
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