摘要:
分别选用ERNiCrMo-2,ERNiCrMo-3,ERNiCrMo-10,ERNiCrMo-12,ERNiCrMo-13及ERNiCrMo-146种镍基合金焊丝,采用手工TIG焊对254SMO/Q235B异种钢板进行焊接试验解决254SMO波纹管与Q235B钢管焊接时出现的裂纹问题.焊后利用光学显微镜、X射线衍射仪、扫描电子显微镜和能谱仪对焊接接头进行了分析研究.发现采用ERNiCrMo-2,ERNiCrMo-3和ERNiCrMo-14焊丝时,焊缝中有较多的微裂纹出现;选用另外3种焊丝进行焊接时,焊缝成形良好,未出现焊接裂纹.结果表明,该焊接裂纹为热裂纹,异种钢物理性能的差异及焊缝中杂质元素的偏析是造成焊接裂纹的关键因素.
Abstract:
Manual TIG was used to weld the dissimilar steel 254SMO/Q235B by taking ERNiCrMo-2,ERNiCrMo-3, ERNiCrMo-10 ERNiCrMo-12,ERNiCrMo-13 and ERNiCrMo-14 nickel-based alloy wire as filler metal. After welding,the welded joint microstructures were analyzed by metallurgical microscope, X-ray diffraction,scanning electron microscope and energy disperse spectroscopy. The results show that when the ERNiCrMo-2,ERNiCrMo-3 and ERNiCrMo-14 welding wire are used,a certain number of cracks will appear in weld. The studies indicate that the welding cracks are solidification cracking. The key factor to cause weld cracking is the difference of physical properties of dissimilar steel and impurity segregation. The welds with good appearance and without welding cracks can be obtained by using the other filler metals.
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