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用扫描电镜对锅炉管子中频对接焊中出现的黑斑进行了分析和研究,认为黑斑实际上是一层复在金属基体上的氧化膜。并解释了其起因,最后提出了解决方法。
Scanning electron microscopy analysis of the spot appeared in the mid-frequency butt welding of the boiler tube, the dark spot is actually a layer of complex oxide film on the metal substrate. Explained its cause, and finally proposed a solution.