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MDH33
01-17-2014, 11:29 AM
I was wondering if any of you skilled welders might be able to help me out with a small project? I tune up crosscut saws in my off season from the Forest Service for some extra income, and I have a few that have broken teeth that I would like to attempt to repair. I don't have welding skills or equipment and this seems like a repair that would require some skill to pull off correctly. If someone would be willing to try this and give me some pointers, I would greatly appreciate it. I can reimburse your time with :beer:. If this works I am planning to buy some welding gear, as I have a whole pile of saws that I could eventually repair.

Here's what I am hoping to accomplish:

These are vintage saws and they are high quality steel. I would like to cut off the broken teeth and replace them with steel from the same saw plate. Looks like it can be done with some careful mig or tig welding and caution to prevent too much heat from travelling through the saw.

I got these photos from a fellow saw filer who has done this successfully, (lives in the PNW).

Here you can see the broken saw and the pieces to be welded:

http://mdhuber.smugmug.com/photos/i-CnQfgNF/0/O/i-CnQfgNF.jpg

http://mdhuber.smugmug.com/photos/i-ftNhXVm/0/O/i-ftNhXVm.jpg

They are using a copper plate to weld over which they pre-heated:

http://mdhuber.smugmug.com/photos/i-PHFjSjX/0/O/i-PHFjSjX.jpg

http://mdhuber.smugmug.com/photos/i-C9ZfwVt/0/O/i-C9ZfwVt.jpg

http://mdhuber.smugmug.com/photos/i-jTKVZZ4/0/O/i-jTKVZZ4.jpg

Here's the weld (mig), slow-cooling and re-tempering with a torch:

http://mdhuber.smugmug.com/photos/i-q2rtJ3T/0/O/i-q2rtJ3T.jpg

http://mdhuber.smugmug.com/photos/i-MxFMV89/0/O/i-MxFMV89.jpg

http://mdhuber.smugmug.com/photos/i-CkZfW6p/0/O/i-CkZfW6p.jpg

Finished tooth before re-shaping with a file:

http://mdhuber.smugmug.com/photos/i-zHL9NS6/0/O/i-zHL9NS6.jpg




Does this look possible?? Anyone willing to give it a shot while I watch over your shoulder?

:weld:

nakman
01-17-2014, 11:38 AM
You lost me at skilled. :) looks like a fun project though, I'd suspect big Tundra John is set up for that type of work?

DaveInDenver
01-17-2014, 11:46 AM
This is something at which John Henley, I expect, would excel.

rover67
01-17-2014, 12:13 PM
DUDE!!

I totally spaced on responding to your PM.

sorry about that... we were travelling and I read it then forgot to respond.

I agree that John would be the best person for the job here.. I'd be willing to give it a shot but I just don't have the right tools for the job... it'd be a hack compared to John..

Hulk
01-17-2014, 01:03 PM
Did you check with Terry Holben?

DaveInDenver
01-17-2014, 01:51 PM
Definitely, Terry is a really good TIG welder.

One time I leaned on John's understanding of brazing and stresses in metal. He was awesome at straightening twisted & distorted skid plates I'd almost ruined by overheating when MIG welding on them.

MDH33
01-17-2014, 03:08 PM
Thanks for the tips guys. I talked to John about it several months ago, but with his cancer recovery and other things he has been pretty busy it seems. I'll hit him up again and reach out to Terry as well.
:thumb:

treerootCO
01-17-2014, 03:32 PM
You can borrow my 220 Miller Mig, Oxy/Acetylene, and anything else you need if that helps. It is just sitting there collecting dust at the moment. I have never understood how to weld high carbon steel or how to harden steel but I assume mig can do it with the right technique.