Abstract
We analyze the experimental data on the influence of various types of hardening treatment (mechanical removal of reinforcement of the weld, argon-arc treatment, blasting, and ultrasonic surface cold working) on the fatigue resistance of welded joints of low-alloy steels under harmonic and impact loads at room and low (–60°C) temperatures. It is shown that the level of fatigue resistance increases after each type of treatment carried out under the same testing conditions. The comparison of the efficiency of the indicated types of treatment under impact loading at low temperature with the original state of the welded joint under harmonic loading at room temperature demonstrates that ultrasonic surface cold working is the most efficient procedure of hardening of welded structures operating at low climatic temperatures.
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