焊接接头在低周加载荷下的变形抗力和断裂抗力取决于它的机械性能、加载状况和应力状态。对机器制造用钢的研究表明,焊接接头的低周疲劳取决于焊接方法。实际焊接接头的疲劳一方面取决于循环载荷下材料的强度和变形特性,而另一方面还取决于应力集中[△] 本文选择了不同级别的低合金建筑用钢——普通强度的09Γ2C(C48/33),强度较高的 Deformation resistance and fracture resistance of welded joints under low cycle loading depend on its mechanical properties, loading conditions and stress conditions. Research on machine building steels shows that the low cycle fatigue of welded joints depends on the welding method. The fatigue of the actual welded joint depends, on the one hand, on the strength and deformation behavior of the material under cyclic loading and on the other hand on the stress concentration [Δ]. In this paper, different grades of low alloy construction steel were chosen - 09 ‰ 2C / 33), higher intensity