So it has been 5 months since I last posted an update to the brewery. I am itching to brew again but with all the equipment torn apart I have to finish all of the updates to actually brew.
In all honesty, I have picked this project up a few times since my last post but each time I ran into some serious issues and frustration led me to shelf the project. I am now at the point where I have to power through to get things wrapped up. I have already done all of the hard work (or so I thought) since I finished all of the soldering on the hot liquor tank.
The soldering that I did on the first pot all seemed to go well with very little issues so I was under the assumption that it wasn’t that hard and I had enough skill to just keep moving forward with the second pot. For whatever reason, the first hole that I went to solder has now taken me months to complete because every time that I attempted to do a task that I had by now done multiple times it just would not cooperate.
I did not take photos of the first few times I attempted this repair because it looked more and more gnarly with each attempt. Similar to some of the holes in the hot liquor tank I did back in December, I was just trying to plug the hole with a patch. With each attempt, the pot would just refuse to solder. No amount of cleaning, grinding, and fluxing seemed to work. This pot was made of 304 stainless just like the first pot so I expected it to be just as easy to work with but this has been a nightmare. It got to the point that the sheet metal was splitting from the heat of multiple soldering attempts.
This leads to today. I decided to do a completely different approach. I got out the dremel and notched out a rectangle from the pot so I could attempt an easier shape.
All of the discoloration around the hole is from the multiple previous solder attempts. I will have to go after those with a brass wheel when this pot is all done.
The idea with this next attempt was to cut a rectangular patch to fill the hole. My thought was that matching a rectangle of new material to a rectangular hole would be easier than trying to cut a circle to match a circular hole.
Here is my sad face plug that I cut for this hole.
I was a little upset that I had to go to these lengths to fix this issue, but I want this project to move forward and I am not terribly concerned with the pots looking amazing. They are intended to be functional first and pretty second.
From the work I did on the first pot I learned a few things that makes soldering easier.
- Both the pot and the plug must be clean.
- Both the pot and the plug must be heated as evenly as possible.
- The plug must match the hole as close as possible. In other words, the gap between the plug and the solder needs to be as small as possible.
Points 1 and 2 are easy to achieve. Just hit the pot and plug with a sanding disk on a die grinder, and wipe them with acetone just before soldering. This is similar to welding. Point 3 is a bit more tough to achieve. I have been using sheet metal snips to cut circular plugs to fill the holes which has been a challenge. Every plug has required some love with a belt sander to get it to fit. This is why I thought that a rectangular plug would be easier to fix.
I ended up being right about a rectangle being easier to cut and fit, but I was wrong about this being the fix. For whatever reason, even with following the three rules above I was just having the worst time soldering a plug into this hole. For whatever reason, this hole just did not want to solder.
I was not going to let this one hole best me however so I decided to go with a more sure fire but uglier method. I overcut the plug such that I could do a lap joint instead of trying to fit a perfect plug. This did end up working after a few attempts.
Here are the post results. The pictures actually make it look a bit worse than in reality. There is more work to be done with the grinding/cleaning effort but the plug is holding.
You can actually see that I had to do two separate plugs that are soldered together from the inside of the pot. There was a split in the sheet metal that was too large to fill with solder. I ended up cutting an additional strip to fill this gap.
So the hole is finally plugged. It only took 5 months and a few very frustrating attempts. I am a bit baffled since I had excellent success with all of the work I did on the other pot. It seems as though the solder gods were just upset with this hole and would not allow it cooperate. This pot isn’t going to win any beauty pageants but its one job is to hold water which it is one step closer to now.
In the future, I may revisit this to make it look better but for my sanity sake I am calling this hole complete.
There are only two more holes that I need to patch. I think I may try cutting the plugs on my cnc to see if I can my plugs to be more accurate without having to shape them to fit on the belt sander.