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Help welding Cast

General welding questions that dont fit in TIG, MIG, Stick, or Certification etc.

Help welding Cast

Postby Schutte » Wed May 10, 2017 1:46 pm

I am a teacher at a high school in Wyoming. Our JrRotc Company asked me to fix their cannon. We all know how budgets are so I'm trying to help them out.

The cannon has a flaw from the casting. Not sure the best way to repair the cannon. It has a sleeve for firing blanks, so structural not an issue for the repair.

Defect is about 3/8" at the deepest point.

They will repaint it once all the repairs are completed.

Thanks for the help,
Schutte
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Re: Help welding Cast

Postby MinnesotaDave » Wed May 10, 2017 4:26 pm

Based on my excellent results on this small cast TIG brazing job, I'd do the same on that cannon.
viewtopic.php?f=9&t=11339

Since it's blank firing it wouldn't bother me to braze it.
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Re: Help welding Cast

Postby Schutte » Thu May 11, 2017 8:43 am

Thanks for the info.
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Re: Help welding Cast

Postby Olivero » Thu May 11, 2017 5:41 pm

Dude... That's awesome.

Hey bob! what'd you do today?

Aaaah, you know. Welded a cannon back togther :lol:

Here is what I would recommend, TIG it with stainless, stainless tends to give it a bit more flex, might even honestly, though it will require more work, be better for you to weld it back up without putting the piece back on if that was even in your thoughts.

Just get a nice bottom "tinned" with stainless and then your just stacking beads on beads on beads until your above the surface, ground it down, flush it up and your good to go.

OR if you want to put the piece back on, do just that and bevel the edges slightly so when it gets finished smooth, there is some weld left to keep it together. Make sure its clean first though, or as clean as it can get. I have welded cast parts from commercial kitchens and getting them clean enough is always tricky but it can be done.
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Re: Help welding Cast

Postby exnailpounder » Thu May 11, 2017 5:52 pm

Hard to tell but that looks more like an air pocket in the casting rather than a missing piece.
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Re: Help welding Cast

Postby Olivero » Thu May 11, 2017 6:41 pm

Nail, what's up with all the ". . . ." posts?
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Re: Help welding Cast

Postby exnailpounder » Thu May 11, 2017 6:49 pm

Olivero wrote:Nail, what's up with all the ". . . ." posts?

I have no idea. I tried to upload a comment and it was tripled and wouldn't let me delete it. Internet is goofy the last couple days.
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Re: Help welding Cast

Postby Otto Nobedder » Thu May 11, 2017 7:13 pm

exnailpounder wrote:
Olivero wrote:Nail, what's up with all the ". . . ." posts?

I have no idea. I tried to upload a comment and it was tripled and wouldn't let me delete it. Internet is goofy the last couple days.


It's cleaned.

I can delete anything... :twisted: (Evil laughter ensues.)

Steve
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Re: Help welding Cast

Postby Otto Nobedder » Thu May 11, 2017 7:16 pm

Olivero wrote:Dude... That's awesome.

Hey bob! what'd you do today?

Aaaah, you know. Welded a cannon back togther :lol:




I love that! I get to say I worked on the Hindenburg's second cousin today, but I have never said, "I fixed a cannon..."

Steve
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Re: Help welding Cast

Postby exnailpounder » Thu May 11, 2017 8:02 pm

Otto Nobedder wrote:
exnailpounder wrote:
Olivero wrote:Nail, what's up with all the ". . . ." posts?

I have no idea. I tried to upload a comment and it was tripled and wouldn't let me delete it. Internet is goofy the last couple days.


It's cleaned.

I can delete anything... :twisted: (Evil laughter ensues.)

Steve

Thanks Steve.
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