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采用不同的氩弧焊焊接工艺,选用ER55-B2-MnV焊丝,对管壁厚为5mm的T91和12Cr1MoV两种耐热钢材料进行了焊接,焊后观察焊缝成形及焊缝各区域显微组织。通过电化学腐蚀试验,研究了不同工艺焊接的异种钢焊接接头的抗腐蚀性能。结果表明:T91/12Cr1MoV异种耐热钢管对接焊焊缝区组织不均匀,最佳焊接电流为120A。在电化学腐蚀试验中,当焊接电流为100A和140A时焊缝在3.5%NaCl溶液中耐腐蚀性能低于两种母材,120A试样的焊缝区由于存在大量较为均匀的马氏体使得其耐腐蚀性能优于100和140A试样。
Different welding processes of TIG welding were adopted. The ER55-B2-MnV welding wire was used to weld T91 and 12Cr1MoV two heat-resisting steel materials with a wall thickness of 5 mm. After welding, the microstructure of the weld and the microstructure of each weld were observed organization. Through electrochemical corrosion test, the corrosion resistance of dissimilar steel welded joints welded with different technology was studied. The results show that the microstructure of butt weld zone of T91 / 12Cr1MoV dissimilar heat resistant steel pipe is inhomogeneous. The optimum welding current is 120A. In the electrochemical corrosion test, when the welding current is 100A and 140A, the corrosion resistance of the weld in the 3.5% NaCl solution is lower than that of the two base metals. The weld zone of the 120A sample has a large amount of relatively uniform martensite Its corrosion resistance is better than 100 and 140A samples.