It is obvious that the machining marks in both cases take the form of a spiral.

很明显在这两种情况下机加工痕迹都是螺线形式。

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The resulting machining marks are, therefore, a helix having a very small pitch, which is equal to the feed. Consequently, the machined surface is always cylindrical.

所以，由此产生的机加工痕迹是一条具有很小节距的螺旋线，该节距等于进给。因此机加工表面始终是圆柱形的。

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The basic theory and process for machining marks (code) on the outer wall of pipe with electrolyse-jet are introduced. A reasonable process rule is thus given experimentally.

介绍了采用电解一射流加工法在油管外壁表面加工标记（号）的基本原理及其过程，通过实验总结出了较为合理的工艺规范。

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