I need to weld DOM to a pinion shaft - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-22-2010, 05:45 PM   #1 (permalink)
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I need to weld DOM to a pinion shaft

So, I'm rigging up a 2-piece D-shaft in my brother's rig. I have a pinion and a piece of D-shaft DOM I need to join. I also have a miller 252.

How do I weld to the hardened shaft without loosing it's hardness and just twisting off?
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Old 02-22-2010, 06:27 PM   #2 (permalink)
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Originally Posted by adam90xj View Post
So, I'm rigging up a 2-piece D-shaft in my brother's rig. I have a pinion and a piece of D-shaft DOM I need to join. I also have a miller 252.

How do I weld to the hardened shaft without loosing it's hardness and just twisting off?

Even if it loses it's hardness, it's still a 2" thick solid piece of steel....?
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Old 02-22-2010, 06:49 PM   #3 (permalink)
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Quote:
Originally Posted by adam90xj View Post
So, I'm rigging up a 2-piece D-shaft in my brother's rig. I have a pinion and a piece of D-shaft DOM I need to join. I also have a miller 252.

How do I weld to the hardened shaft without loosing it's hardness and just twisting off?
What are you talking about??
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Old 02-22-2010, 07:03 PM   #4 (permalink)
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I don't think there is any way to weld it without loosing the hardness, unless you just don't weld it. It might not even be fully hardened anyways, might just be case hardened for wear protection.
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Old 02-22-2010, 07:21 PM   #5 (permalink)
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I don't think there is any way to weld it without loosing the hardness, unless you just don't weld it. It might not even be fully hardened anyways, might just be case hardened for wear protection.
I was guessing it was only case hardened for that very reason. I've seen it done on here before. I can't seem to find the thread again tho.

I'll give it a whirl and see what happens.
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Old 02-23-2010, 10:07 AM   #6 (permalink)
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Best you're going to get is to drop it in water as soon as you are done welding. The weld is going to austenitize the area, there's no way around that. So then you can either try to harden it from there by quenching it or let it cool on its own which will probably anneal it. If you quench it, make sure to at least put it in an oven afterwards for a temper, otherwise it will be super brittle untempered martensite.

This does not take into account specific material, previous hardening, distortion, or cracking.

Last edited by Aidan; 02-23-2010 at 10:08 AM.
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Old 02-23-2010, 01:21 PM   #7 (permalink)
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Just weld it up. Me and several of my buddies have done the same thing and have been beating on them for a couple of seasons now with no failures.

Paul
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Old 02-23-2010, 07:12 PM   #8 (permalink)
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Just weld it up. Me and several of my buddies have done the same thing and have been beating on them for a couple of seasons now with no failures.

Paul
Ok cool. I ordered some carrier bearings from surplus center... they are cast of course and they don't look to beef. Where are you guys sourcing your bearings from?
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Old 02-23-2010, 07:16 PM   #9 (permalink)
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Post up some pics...
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Old 02-23-2010, 07:55 PM   #10 (permalink)
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I just welded to pinion shafts together yesterday. They are 8620 and they are case hardened. Just MIG it up....You can use an aluminum heat sink or I've seen this clay type stuff that works good as well. That would keep the heat localized to not affect the splines too badly.
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Old 02-24-2010, 07:43 PM   #11 (permalink)
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I sourced mine from a local bearing supplier. It was about 80 bucks with tax.

Paul
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