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The stress concentrators at MA/MB welding joint will increase by the cross sectional convexity of the fillet weld. Therefore, for variable loaded structures, based on a satisfactory fatigue life, concave fillet welds are preferred likely to ensure low stress concentrators at the MA/MB welding joint due to a smooth passing from the fillet weld to the basic material. The present paper aims is analyse the fatigue life duration raising durability curves based on experimental determination and using the Finite Element Analysis Method.