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The authors studied mechanical properties, fracture toughness, and fatigue crack growth rate in titanium alloy 2V (material of the welded joint) contaminated by oxygen and nitrogen and in titanium alloy VT6C (base metal). The regularities in fatigue crack propagation in a welded joint are studied with allowance for residual welding stresses. It is shown that fatigue crack growth rate dependence on the effective stress intensity factor is invariant to the value of residual stresses.