焊缝余高对A5083铝合金焊接接头低温疲劳性能的影响

发布时间：2018-04-05 21:07

  本文选题：铝合金　切入点：焊缝余高　出处：《热加工工艺》2017年21期

【摘要】：针对轨道车辆常用的A5083P-O铝合金焊接接头,分别在带有焊缝余高和不带焊缝余高的条件下,进行了不同低温环境下的轴向脉动拉伸疲劳试验,分析了焊缝余高对接头疲劳强度的影响,建立了疲劳强度与温度之间的定量关系。结果表明:在0~-50℃低温范围内,与不带焊缝余高的对接接头相比,带有焊缝余高的A5083铝合金焊接接头在指定寿命107下的疲劳强度降低近30%,其中无焊缝余高接头的疲劳破坏主要发生在焊缝区,而带有焊缝余高的接头大多起裂于焊趾处;随着环境温度的降低,接头疲劳强度呈指数规律升高,当温度从0℃下降到-50℃时,接头疲劳强度提高近13%。
[Abstract]:The axial pulsating fatigue tests of A5083P-O aluminum alloy welded joints commonly used in rail vehicles were carried out under different low temperature conditions under the condition of high weld surplus height and no weld residual height respectively.The influence of weld residual height on fatigue strength of joints was analyzed and the quantitative relationship between fatigue strength and temperature was established.The results show that in the low temperature range of 0 ~ 50 鈩，

本文编号：1716449