BT20钛合金焊接接头的轴向疲劳性能在应力集中系数Kt=1时的各种应力比的条件下，盐雾环境和SO2酸性盐雾环境下的疲劳寿命都有所降低，其中 SO2酸性盐雾环境对疲劳寿命影响最显著；在疲劳寿命N=105处，应力比 R由0.5变为0.06时，潮湿空气使疲劳强度下降18%，盐雾腐蚀使疲劳强度下降16%，SO2酸性盐雾使疲劳强度下降7%。
The axial loading fatigue testing results show that the fatigue life of welded joints of BT20 titanium alloy decreased under the condition of salt fog, SO2 and salt fog at different stress radio and stress concentration factor K t=1. The loss of fatigue life was obvious in acidic of SO2 and salt fog. As stress ratio R changsed from 0.5 to 0.06 at fatigue life N=105, wet air made fatigue strength decreases 18%，salt fog made fatigue strength decreases 16%, SO2 and salt fog made fatigue strength decreases 7%.
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