为了研究AZ31B镁合金钨极氩弧焊接件应力腐蚀性能,室温下采用三点加载的方式,在去离子水中对试样进行应力腐蚀试验.利用光学显微镜(OM)观测试样微观结构,利用扫描电镜(SEM)观测应力腐蚀断口,利用X-350A型X射线应力仪和CHI660B型电化学工作站分别测定试样表面残余应力和动电位极化曲线.试验结果表明:采用单面焊双面成型工艺,在45～50 A的焊接电流及合适的焊接速度条件下,焊接2.2 mm厚AZ31B镁合金薄板时,钨极氩弧焊能够获得理想的焊接接头,抗拉强度达到209 MPa;焊接件热影响区表面残余拉应力为60 MPa；同母材相比,焊接件自腐蚀电位减小27 mV,腐蚀电流增大了41.4％,从而增加焊接件腐蚀倾向；AZ31B焊接件在去离子水中浸没192 h后出现应力腐蚀开裂,属于穿晶型脆性断裂,这表明AZ31B镁合金焊接件在去离子水中具有很高的应力腐蚀敏感性.
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