The fatigue life of a manual metal arc welded cruciform joint failing
from a root lack of the penetration region is estimated by the applica
tion of crack growth relations. A two-parameter relation was used. The
initiation life and propagation life of the joint were taken into acc
ount to obtain the total fatigue life of the joint from the crack grow
th parameters. To test the accuracy of the method, the predicted data
was compared with the experimental data for a C-Mn type steel welded j
oints. The results were in good agreement with the experimental data.