The article introduces how to produce flat end pipes on original plug pipe mandrel through technical modification and economic benefits.
本文主要介绍如何在原有的承插管道芯模上通过技术改造生产平端管道，以及工艺改造带来的经济效益。
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In the metallic tube producing method, a maximum diameter of the plug or tapered mandrel bar may be larger than an outside diameter of the mother tube.