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直驱永磁同步风力发电机支架主焊缝残余应力研究

Zhen ZHAO, Qingbing WANG, Liren LIANG,Xiaoxiang HONG,Weiqiang GUO

Electric Welding Machine（2018）

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Abstract
针对风力发电机支架中主焊缝的焊接残余应力展开测量试验研究.选用MAG焊预制实际工况下40 mm厚的Q345D平板对接接头,按指定的焊接工艺规程完成多层多道焊接.焊接过程采用小孔法分别测试第4道、8道及12道焊后接头残余应力,测试结果表明纵向残余应力(σx)在焊缝中心区为残余拉应力峰值区,向母材方向逐渐减小,在远离焊缝中心的母材上为残余压应力;横向残余应力(σy)从焊缝中心区附近向母材一端残余拉应力由峰值逐渐减小.
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