JB Weld to fill corrosion pitting.
I am rebuilding my old Weil Mclain steam boiler. A steam leak eroded the elastomer seal and then corrosion caused pitting of the seal face. The deepest corrosion is less than 0.02". I used JB Weld to fill the void. The repair looks great and is solid, but does anyone have experience with such restorations that you can share?
Comments
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Unless you got the surface down to clean metal, it won't stay put in any kind of long run.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England0 -
The surface was well-prepared for a good bond. The repair is located directly underneath the elastomer seal, so there is no particular stress load. My concern is whether the JB Weld will hold up to thermal cycling and low pressures (<3 psi.)
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I never used it on an internal boiler surface. But we serviced a ton of HB Smit CI boiler the "Mills Style" boiler. Thes boilers had sections that were connected to a CI header external to the boiler. The connections to the header were an 1 1/2" or 2" nipple (depending on the model boiler) with a locknut and an elastomer gasket. When the gasket leaked the surface on the CI header would get corroded and pitted. We used to grind them down and this worked as you could tighten the locknut to make up for the metal ground off.
But some of them were too pitted to take off that much metal so we ground it as much as possible then used JB weld.
It worked well.
How long it lasted I can't really say but we had no problem getting the gaskets to seal. At the very least it will buy you a few years.
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permatex would be better because it will flex the same as the o-ring but jb weld will probably work as long as you got it down to cast iron.
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Not sure Permatex will get along with the gasket material
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a belt sander works better than a grinder because it makes it at least somewhat flat.
i guess you couldn't be 100% sure without getting a bunch of engineers together but it is kind of designed to seal where 2 molded gaskets come together, it is very commonly specified for that on engines.
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