welding question

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
 
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
 
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
 
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.
 
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
 
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.
 
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
 
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.
 
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
 
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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