Disk Weld Cracking?

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stryfe
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Disk Weld Cracking?

Post by stryfe » November 17th, 2017, 5:03 pm

Hello all, I'm a little new to the group and new to Disco's

I made my own a few weeks ago, from a disk I got from a farmer in AZ. I welded a piece to fill in the hole in the center but have noticed my welds are cracking. Now, I'm not a professional welder, a hobby welder only.

I tried last weekend doing a little grinding and rewelding the crack but have seemed to only make things worse, the welds cracked even more. I'm guessing it has to do with the difference between the very hard Disk and milder filler material and the amount of heat and cooling rate. So..

1) what do most use to fill the disk holes? I wish I could have used a scrap piece of another disk.
2) Any advice on how best to go about fixing my cracking issue?

Thank you
Craig



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Re: Disk Weld Cracking?

Post by Bricklayer2 » November 17th, 2017, 8:26 pm

I replaced the disc on my harrow a few years back. The disc that was available to me had several different grades or quality depending on how much you can or want to put into them cost wise. The better quality was a tempered steel so I am wondering if you would heat the whole disc to anneal the steel if it would allow for a better weld. I am thinking if you have tempered disc you are getting a localized anneal in the steel creating stress cracks. Just my opinion though. ;)



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Re: Disk Weld Cracking?

Post by ajfoxy » November 18th, 2017, 5:35 pm

Yes, I'd be of the same opinion as Bricklayer2. I think if you could heat the whole thing to slightly under cherry and then put it in Perlite/kitty litter/sand to cool slowly you might be able to weld it a tad better.


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Re: Disk Weld Cracking?

Post by stryfe » November 20th, 2017, 2:37 am

Unfortunately, I have been thinking the same thing. Ok now to figure out how to anneal a 22" disk, LOL



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Re: Disk Weld Cracking?

Post by ajfoxy » November 20th, 2017, 4:29 am

A couple of weed burners, a few dozen beers and you are done. Do not pour the beer on the hot steel it will harden it... :D
Don't forget to cool it slowly. A couple of bags of kitty litter/perlite or similar and bury the almost cherry red disk. Consume more beers and the next day you can grind out the old weld and reweld it.


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Re: Disk Weld Cracking?

Post by stryfe » November 20th, 2017, 11:10 am

I've got a 65,000 BTU burner, do you think that will get it hot enough?



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Re: Disk Weld Cracking?

Post by ajfoxy » November 20th, 2017, 4:11 pm

Possibly, but two or more are preferable so you don't have to chase the heat around. Get a buddy to do one side while you do other. That still leaves the left hand free to hold a sample of your favourite beverage.
If you are stuck on how to heat up the disk on your own... find a drum that is not useable for a UDS cut the bottom third out (leave the bottom on). Poke a few holes around the edge for air. Fill up with wood, charcoal, brickets etc get roaring flame and lots of heat. Put your disk on top (not in) and heat it up. Then attack the top with your burner to speed up the process. Have your kitty litter in the top bit of the drum ready so when it gets just off cherry, you don't want to overheat it, you can put it in the kitty litter, pour more kitty litter on top and leave it until the next day.

Just an aside: Metal at just of cherry or less (dark heat) burns you way worse than white hot metal. White hot metal will sear and drop away, black hot will stick and create a very painful burn. DO NOT touch it to see how hot it is...


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Re: Disk Weld Cracking?

Post by stryfe » November 20th, 2017, 5:29 pm

Don't touch Hot Metal!! Check.

I'll pick up a weed burner and see what I can do this long weekend, Thanks for the advice.



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Re: Disk Weld Cracking?

Post by The Czar » December 18th, 2017, 5:28 pm

Well do you still have fingerprints?


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Re: Disk Weld Cracking?

Post by Frank_Cox » December 18th, 2017, 8:41 pm

plenty of beer.... got it

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Re: Disk Weld Cracking?

Post by Dirtytires » January 10th, 2018, 11:44 pm

I think I got the same disk....bought mine new tho. I have the same problem but it's holding so I'm probably gonna just live with it unless it gets worse. Sounds like you are in Az...I'd be interested if your farmer has a pile of disks and just wants to get rid of them. I like your idea of cutting a patch out of a scrap disk but I'm not buying a new $40 disk just to cut a 2 inch square out of it.



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Re: Disk Weld Cracking?

Post by nanuk » March 25th, 2018, 3:01 pm

wouldn't laying it on a wet rag, and slowly stitching it work OK?



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Re: Disk Weld Cracking?

Post by Dirtytires » March 25th, 2018, 9:16 pm

My understanding is that it cracks because the two metals cool at different rates which pulls it apart by cracking...but I’m not the expert.



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