Reasons for corrosion of heat exchange tubes
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The vaporization flash steam was used to heat the air in the blower; however, the heat exchanger developed leaks within less than a year of operation. The leaks occurred mainly at the joints between the heat exchange tubes and the small header tubes, and there was also water seepage from those small header tubes. I would like to know what causes these leaks. Similar to the interface between the heat exchange tube and the small header tube, there is a series of pearl-like protrusions and depressions.
The material may have been damaged during welding.
It seems to be due to welding; it looks exactly like it was burned by electric welding. . .
It seems to be a welding issue; there’s over-welding
This post was last edited by xlxuiin on 2017-5-24 10:12: The welding was not done properly, and the insertion depth of the heat exchange tubes was insufficient； Vibration of the heat exchange tubes causes leakage