彩板生产线预处理工艺段原设计缺陷造成彩板质量问题。

Mistakes in the original design of the pretreating process section of the color coating line caused certain quality defects on the product.

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本文主要论述了酸洗工艺段自动控制系统的组成、主要功能及操作方式，并介绍了一些改进的控制措施。

The composition, main function and operation mode of the automatic control system for the pickling process section are discussed, and some improved control methods are introduced.

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从焊缝处的发现的晶粒内存在的大量多边形化的亚晶的现象推断出出现问题的工艺段，通过改进，消除了弯管成型开裂的情况。

We found the place where the processing set-up was wrong by analysing the phenomenon and solved the cracking problem through the improvement.

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