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RE: corrosion at weld points[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaint(--nospam--at)seaint.org>
- Subject: RE: corrosion at weld points
- From: Harold Sprague <spraguehope(--nospam--at)hotmail.com>
- Date: Mon, 28 Apr 2008 21:02:07 +0000
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.
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