补焊次数对S355J2W+N低合金钢T型接头疲劳性能和组织的影响

Effect of Repair Welding Times on Fatigue Properties and Microstructure of S355J2W+N Low Alloy Steel T Welding Joints

针对铁路客车焊接转向架的T型焊接接头,通过对未补焊接头、以及补焊一次、两次、三次、四次的焊接接头进行试验,总结出补焊次数对焊接转向架T型接头疲劳性能和显微组织的影响,为铁路客车转向架的工艺制定和可靠性提供了技术理论与实践数据支持.试验结果表明:一次、二次补焊对S355J2W+N低合金钢T型接头疲劳强度影响不大,而三次及以上补焊次数会稍微降低S355J2W+N低合金钢T型接头疲劳强度,不同补焊次数对显微组织无明显影响.

For railway passenger train welded bogie T welding joint, the test of without repairing welding and times of repairing welding summed up the impact of the repairing welding times on the welding bogie T joint fa- tigue performance and microstmcture,and provides theory, and technology and practice data support for railway passenger train welded bogie. The results show that the once and twice repair welding have little effect on the fatigue strength of the S355J2W ＋ N low alloy steel 3＂ welding joints,and the fatigue strength of S355J2W ＋ N low alloy steel T joint is reduced a little when the times is more than three,and the number of repair times had no significant effect on the microstructure.