将罐接头与盖连好，将阀门旋入接头直至底部封口盖；
The tank connector and cover with a good will into the connector until the bottom of the rotary valve sealing cap;
通过时大量熔化焊接头的金相观察，研究了熔化焊接头焊缝底部附近“不均匀混合区”的形貌特征。
The appearence characteristics of the heterogenous mixture zone near the bottom of weld metal in the fusion welded joint are studied through metallographic observations of many fusion welded joints.
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