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7N01S-T5铝合金焊接接头疲劳性能

Shubo WEI,Yue LIU,Jian LIU,Xifeng FANG,Yongming CHEN,Hui CHEN

Electric Welding Machine（2015）

Cited 23|Views1
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Abstract
对MIG焊接得到的板厚为10 mm的7N01S-T5铝合金焊接接头进行疲劳试验,研究其疲劳性能,通过对疲劳试验后的试样进行金相组织观察和断口SEM观察,分析其疲劳试验前后显微组织变化以及断裂的原因.结果表明,7N01铝合金焊接接头的疲劳极限为111.6 MPa,经过疲劳试验的焊接接头断裂在硬度值最低的焊缝处,裂纹沿垂直于焊缝柱状晶的方向扩展.疲劳源处未见明显的夹渣、气孔等缺陷.焊缝处析出相聚集在晶界,部分区域出现了液化裂纹.
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Key words
alloy,aluminum,joint,fatigue
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