"pitting in HAZ on mild steel"

Question:

"I have been asked a question about some pitting corrosion that a customer has found on the the tire side of a heavy equipment wheel. The pitting is along the weld and one side of the weld for about an inch. The opposite side is free of any pitting. The material on the uncorroded side is regular A36. The side in question is machined and should be A36 but.... I am thinking that it is not the case. Any input would be appreciated. I am guessing that the corrosion might be aggravated by moisture inside the tire at assembly?? Would a nitrogen or inert atmosphere remove the problem?"

Answer:

I question whether the reduced corrosion resistance of the center of the plate accounts for the preferential corrosion observed, versus the other side. That is not our experience. Perhaps the microstructure is more sensitive to pitting corrosion, related to thickness, perhaps not. The only way that I could provide additional information would be to personally observe the wheel.

 

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