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welding question


 
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NHbalerman
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PostPosted: Tue Sep 24, 2013 6:52 am    Post subject: welding question Reply to specific post Reply with quote

On my NH 488 haybine it has a stress crack on the side of the wobble box,what would be the proper proceedure to repair this crack? Should I weld the crack and grind it down smooth and then put a flat piece of metal over it and weld it on and should I weld all the way around the plate or just 2 sides or what? Want to fix it right but I am not a welder or a fabricator. Thanks
 
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Welding man
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PostPosted: Tue Sep 24, 2013 8:22 am    Post subject: Re: welding question Reply to specific post Reply with quote

A picture would help.
 
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NHbalerman
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PostPosted: Tue Sep 24, 2013 9:34 am    Post subject: Re: welding question Reply to specific post Reply with quote

I wish that I could but I don't have a camera to post pictures,it is just a crack along the side that I need to fix and wanted some professional advice on how to fix it right.It is a place that is under a lot of stress and some vibration. Thanks
 
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Ellis Kinney
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PostPosted: Tue Sep 24, 2013 9:56 am    Post subject: Re: welding question Reply to specific post Reply with quote

I would strongly suggest hiring someone who knows his way around farm machinery and has welding experience. Find the end of the crack and go 1/8 inch farther and drill a small hole to stop the crack. A difficult piece of equipment is not the time to learn to weld. Ellis
 
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NHbalerman
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PostPosted: Tue Sep 24, 2013 11:14 am    Post subject: Re: welding question Reply to specific post Reply with quote

I can weld fairly good I just dont know all the tricks to fixing something like this and all the welders around here are in oil field and they want talk about doing a little job like this and there isn't any more of the small welding shops around anymore
 
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Tony S.
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PostPosted: Tue Sep 24, 2013 11:17 am    Post subject: Re: welding question Reply to specific post Reply with quote

Is it cast iron? Is it the gearbox itself or the frame?
 
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RayP(MI)
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PostPosted: Tue Sep 24, 2013 11:54 am    Post subject: Re: welding question Reply to specific post Reply with quote

Sounds like something for a professional welder.
Especially if it's cast. I have had some success with wire welding some cast of dubious origins, but certainly don't recommend it. Lotta good welders would hang me from an apple tree for doing that.
 
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RodinNS
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PostPosted: Tue Sep 24, 2013 2:22 pm    Post subject: Re: welding question Reply to specific post Reply with quote

I'd be more concerned about ~why~ is cracked rather than the crack itself. Usually something else is about to let loose...
I'm not sure about that wobble box but I suspect most are cast steel... thus can be beveled out and welded with a 7018. If it's actually iron, it's probably best to braze it. Iron could be welded with a Sodel 35 rod or similar type of NiRod... but they thing you have to remember about arc welding on that, wether it's steel or iron... is distortion. If the welding moves something inside the box you could be making larger problems for yourself.

Rod
 
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jon f mn
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PostPosted: Tue Sep 24, 2013 6:25 pm    Post subject: Re: welding question Reply to specific post Reply with quote

It's hard to say how to weld without a pic. Weld it and grind it and plate it. You will be better off than just a weld. Where to weld the plate depends on what you are working with. If you can plate out past the box and in to the main frame then probly weld all the way around. If you can just cover the weld try to weld the opposite direction of the crack if you can get 3 or 4 inches of weld on each side of the crack. Also you can drill or torch holes in the plate and plug weld it. that will help. Welding parallel to the crack may give you another place to crack.
 


Last edited by jon f mn on Tue Sep 24, 2013 6:38 pm; edited 1 time in total
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NHbalerman
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PostPosted: Tue Sep 24, 2013 6:33 pm    Post subject: Re: welding question Reply to specific post Reply with quote

OK that is the answer I was looking for is to weld opposite of the crack,not parallel,it is on the side of the header just mild steel that the wobble box bolts to,also found a housing that has a little slack at the bearing that I will fix for the vibration that caused the crack,Thanks for the help
 
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jon f mn
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PostPosted: Tue Sep 24, 2013 6:39 pm    Post subject: Re: welding question Reply to specific post Reply with quote

Reread what I wrote, I edited a bit and that should help more.
 
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M w J
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PostPosted: Tue Sep 24, 2013 7:51 pm    Post subject: Re: welding question Reply to specific post Reply with quote

If it is cast iron don,t try to weld it with oil in it will pit the weld and leak. Drain the oil and heat it enough to burn the oil out of the crack but you might have to heat a fairly large area. Then use nickle Rod and it will work better then most other things stronger the brazing.
 
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RodinNS
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PostPosted: Wed Sep 25, 2013 4:39 am    Post subject: Re: welding question Reply to specific post Reply with quote

If this is just the mild steel frame of the machine, don't worry about it. Bevel it out and weld parallel to the crack with a 7018. No question about it. Run a couple more passes to add a good crown over it and leave it. I wouldn't plate it.

Rod
 
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Welding man
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PostPosted: Wed Sep 25, 2013 2:30 pm    Post subject: Re: welding question Reply to specific post Reply with quote

I totally disagree with that. The nickel is stronger than brass, but the cast in the heat affected zone of the weld will be more brittle and will crack quicker than if it is brazed.
No the weld won't break but the cast beside it will be even weaker than before.
 
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