Abstract
1. Under conditions of rigid, low-cycleloading by symmetrical bending the effect of preheating temperature in welding and tempering on the tendency of grade 10KhMF weld metal to the formation of cracks in the presence of stress raisers is not brought out. The resistance to crack development decreases on increasing the preheating temperature from 150–200 to 450–500°C and after tempering at 730°C. 2. The connection between the rate of crack propagation in the metal of the joints investigated and the stress intensity factor K can be described by the equation dl/dN=cKm, where the exponents m as a function of the temperature conditions of welding and tempering varies over the range 3.7–6.7.
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