求翻译：因为标书中提到，MEW检验工程师要在现场验证焊接过程及相关的检测和试验，并且要确认法兰件的化学成份和机械性能，所以我们在正式确定制造商时要注意上述问题。是什么意思？

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As mentioned in the book, MEW inspection engineers to be validated in the field of welding procedures and related test pilot, and flange to confirm that the chemical composition and mechanical properties, we determine the manufacturer, in the official to take note of the above issues.

Because in the sign book mentioned, MEW examines engineer to have in the scene confirmation welding process and the correlation examination and the experiment, and must confirm the flange chemical composition and the mechanical property, therefore we in official determination manufacturer time must

As mentioned in the tender, MEW test engineers on site to verify that the welding procedure and the relevant inspection and test, and to confirm that the flange of the chemical composition and mechanical properties, so we formalized the manufacturer should pay attention to these issues.

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