实践证明，采用双重密封结构，取消传统MOA中的隔弧筒和引拔棒，提高了MOA的密封可靠性。

Practice shows that the sealing reliability of MOA have been enhanced by using the double sealing and excluding traditional arc-isolating cylinder and FRP rode.

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提出了一种新型的双重单端正激式弧焊逆变电源，采用IGBT为开关器件，引入了电流型脉宽调制控制器。

A new double single-ended forward arc welding power inverter with IGBT as power device and current PWM controller is introduced in this paper.

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结构分析考虑双重非线性情况，采用弧长法跟踪整个荷载—位移全过程的平衡路径，确定极限承载力。

Double nonlinear factor was considered in the structure analysis. To calculate the ultimate bearing capacity, the equilibrium path of the load and displacement using arc-length method was traced.

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