Abstract
We determine the brittle-fracture resistance of the metal taken from various zones of welded joints of 34KhN3MA steel produced from electrodes with different phase compositions or their combinations. It is shown that, regardless of the zone of welded joint in which a notch is made in the specimen, the highest values of impact toughness are observed for the weld metal obtained from the austenitic electrode. At the same time, the lowest value of impact toughness are observed for the combination of austenitic (weld root) and ferrite-pearlite electrodes. For any applied electrode, the lowest values of impact toughness were always observed for the metal of the heat-affected zone. Therefore, this zone determines the serviceability of welded joints under dynamic loads. The results of fractographic investigations demonstrate that austenitic electrodes are optimal for the purpose of welding of sheets made of high-strength steels because they guarantee the highest fracture energy of the joints under the action of dynamic loads.
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