[fridg]

This is from using flux on a steel to copper connection , when using flux you should always clean your flux off & paint the brazed section to stop the air reacting with it. As you know 2 dissimilar metals & a liquid can create an electrolytic solution like a capacitor.

We always painted this type of weld in our manufacturing plant for this very reason to stop pitting.

 

[fridg]

What do you think? Should I try to braze a layer of StaySilv 45 over the entire area, or should I cut out the are affected and try to braze a new line closer to the compressor housing?

Thank you.

I would be cleaning all the pits out with a wire brush & emerytape , hitting the weld with flux & 15% silver solder , cleaning all the flux off & painting the braze.

 

[fridg]

Sorry I should have stated 45% silver solder , not the 15%.
And don't be sparingly on the flux , put plenty of that on the pipe & on your solder while brazing. Sorry for any confusion.

 

[fridg]

I believe Manitowoc uses 55%
They even send a piece out with replacement compressors. This is strait up corrosion because of the freeze thaw pattern on this cap tube machine and the insulation was butted right up to the compressor shell. The area stays wet all the time when it's not frozen

A coat of paint or tar paint should reduce this no ?

 

[fridg]

I would think so.
Do they have those in China?

1" less of insulation would probably do the trick since they are being cheap.

Seen some insulation siliconed to the compressor shell in the -80° machines. Maybe that would work too.

That would be an extra step in the production process , never going to happen. :grin2:

If they made the insulation 1" smaller they would have to adjust their jig measurements for cutting , to much work. :grin2::grin2: