In order to decrease weld defect , the upper limit welding current should be adopted.

为避免夹渣的产生, 在焊接P91焊口时,宜采用焊接工艺评定电流上限焊接.

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The result shows that the severe weld defect is mainly responsible for the fracture.

研究显示,内部锥形封头的环焊缝上的未焊透和未熔合缺陷是产生断裂事故的根本原因.

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