Cr20Ni80合金棒材闪光对焊特性

Specialities of flash butt welding of Cr20Ni80 alloy bars

对电热合金Cr20Ni80进行连续闪光对焊研究,讨论其焊接接头的力学性能、微观组织和接头硬度.结果表明:在选定的工艺参数条件下,焊缝结合良好,接头平均抗拉强度达到555MPa,延伸率为18.7%,断面收缩率为20.8%;接头结合致密,无明显焊接缺陷;在焊缝处硬度最低,两侧的热影响区硬度明显增大,与母材相比没有出现软化现象.闪光对焊对Cr20Ni80合金的焊接具有良好的适应性,可得到性能优良的焊接接头.

Flash butt welding of electrical heating alloy Cr20Ni80 was investigated and the mechanical properties, microstructure and hardness of the welded joints were discussed. The results showed that, on condition of selected process parameters, welding seam was good, the average joint tensile strength achieved 555 MPa, elongation rate-18. 7 %, cross-section reduction-20. 8%, and with no noticeable welding defects. Minimum hardness took place in the weld seams, the hardness in the heat-affected zone increased greatly. Compared with its parent material, there was no softening phenomenon. Flash butt welding of Cr20Ni80 alloy exhibited good adaptability and a welding joint with fine performance could be obtained.