Influence of Welding Methods on Fatigue Properties of 10Ni5CrMoV Steel Welded Joints
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摘要: 针对屈服强度为785MPa级别的10Ni5CrMoV钢,分别采用焊条手工焊、气体保护焊和埋弧焊三种方法在其表面堆焊单层焊并设计成板状疲劳试样,研究三种焊接方法对10Ni5CrMoV钢接头疲劳性能的影响。结果表明:对于堆焊单层焊道试样,焊址处应力集中程度对疲劳启裂寿命起主要作用,随应力集中程度的增大,疲劳启裂寿命减小。焊条手工焊、埋弧焊和气体保护焊三种焊接方法中,气体保护焊焊趾处应力集中程度最大,疲劳启裂寿命最低;焊条手工焊焊趾处应力集中程度最小,疲劳启裂寿命最高。Abstract: Tabular fatigue specimen were designed by overlaying a single-pass welding on the surface of 10Ni5CrMoV steel whose yield strength reached to 785 MPa by three kinds of welding methods of SMAW, GMAW and SAW. Researches were conducted on the influences of the three kinds of welding methods on fatigue properties of 10Ni5CrMoV steel welded joints.Results indicated that, for the single layer surfacing welded specimen, the stress concentration of welding toe had a main influence on the fatigue crack life, which shortened with the increase of the stress concentration. Among the three welding methods of SMAW, SAW and GMAW, the stress concentration of GMAW was the highest, and the fatigue crack life the lowest; the stress concentration of SMAW was the lowest and the fatigue crack life highest.
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Key words:
- welding method /
- welded joints /
- fatigue
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