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The secondary preheating current is an important quality index for welding rails with GAAS80 type welding machine. In the welding process, it is with normal distribution. Whether the capability of secondary preheating current in welding process meeting the technical standards is sufficient or not can be effectively determined by analyzing the secondary preheating current with process capability index method, which is of great significance to improving the production efficiency of welding machine and ensuring stable quality.

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利用GAAS80型焊机焊接钢轨时，二次预热电流是一项重要的质量指标。在焊接过程中，二次预热电流呈正态分布。采用过程能力指数的方法对二次预热电流进行分析，可有效的判断出焊接过程中的二次预热电流满足技术标准的能力是否充足，对提高焊机生产效率，保证质量稳定具有重大意义。

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李中原（1977-），男，内蒙古包头市人，硕士，高级工程师，现从事钢轨焊接工作。

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李中原（1977-），男，内蒙古包头市人，硕士，高级工程师，现从事钢轨焊接工作。

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