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提出了一种用于小直径单层薄壁焊接钢管在线切断的新方法──飞模切断，设计了切断飞模，并经实际应用，效果良好。
A new method for on-line cutting small-diameter single-walled thin-walled welded steel pipe is proposed. The die is cut off, the flying die is designed, and the practical application is effective.