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RE: corrosion at weld points

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PSI produced a document some time ago called "Corrosion and Failure".  Part I was "Fundamentals of Corrosion".  In it they discuss crevice corrosion as a subset of localized corrosion. 
Welding often results in surface irregularities and some minor pitting that does not degrade the strength of the weldment, but will provide a place to initiate crevice corrosion.  Coatings do not penetrate the mated surface of weldments and can be a point of corrosion initiation.  Even properly applied coatings may not cover welding surface irregularities. 
If the weld is continuous and ground smooth, the problem should be mitigated.  If this is a pervasive problem, you may want to consider a CJP or PJP that will be reinforced with a fillet weld and then dressed with a grinder.  This will minimize surface irregularities and exposure to the unwelded mated surfaces.  

Harold Sprague

From: akester(--nospam--at)
To: seaint(--nospam--at)
Subject: corrosion at weld points
Date: Sun, 27 Apr 2008 19:52:01 -0400

More than once while doing forensic work, I have seen severe corrosion at unprotected and painted steel specifically at or near the welds. Both the the connected member and the main member. Is this due to some chemical reaction during the weld process that makes the steel more susceptible to corrosion? Any links or PDFs on the subject would be appreciated. I am guessing it has something to do with the carbon content or some other metallurgic reason.
Andrew Kester, P.E.
Principal/Project Manager
ADK Structural Engineering, PLLC
1510 E. Colonial Ave., Suite 301
Orlando, FL 32803

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