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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不同相成分电极生产的34KhN2MA钢焊接接头的冲击韧性

我们确定了从 34KhN3MA 钢焊接接头的各个区域中取出的金属的抗脆性断裂性能，这些区域由具有不同相成分或其组合的电极制成。结果表明，无论在试样中的焊接接头区域如何，从奥氏体焊条获得的焊缝金属都观察到了最高的冲击韧性值。同时，观察到奥氏体（焊根）和铁素体-珠光体电极组合的冲击韧性最低值。对于任何应用的焊条，总是观察到热影响区金属的最低冲击韧性值。因此，该区域决定了焊接接头在动态载荷下的适用性。