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Ni Rod 55
Need others input, I have a job coming up on a Chevy 4 cylinder out of a boat ,Where the started bolts up , the bolt had loosened up causing the starter to twist breaking the block out where the It bolts up. The break is right in the middle of the bolt hole in the block through the treaded area. Ive tried to weld cast over the years with not a lot of luck. I normally have better luck oxyacetylene and brass. I have some Ni-rod 55 I would like to try. I think instead of trying to weld the piece back on maybe it be better to do a build up, then drill and retap the hole. Any input with using Ni-Rod 55 or other ways to make the repair?
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Re: Ni Rod 55
If you do weld it with 55 you won't be able to weld much at time. Pre heat it some, weld 1/2-3/4" , stop, peen, let sit a short while then repeat. How much area is broken out? If it's not a large area you should be ok. I would grind out a fair amount of the existing threads so you can be assured yo have decent material to drill and tap. If it were mine I would braze it with oxy- acetylene.
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Re: Ni Rod 55
I think NI55 is hard to drill and tap, NI99 is easier. If your more comfortable brazing I'd do that and maybe practice on some broken cast iron.
We've done so much, for so long, with so little. Were now qualified to do anything with nothing !
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Re: Ni Rod 55
Originally Posted by
welding1
I think NI55 is hard to drill and tap, NI99 is easier. If your more comfortable brazing I'd do that and maybe practice on some broken cast iron.
Ditto, use nickel 99 around the threaded holes. Might consider threading a carbon rod and inserting it in the hole to preserve the threads.
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Re: Ni Rod 55
This is not high production, so, you could try something a little different,,
Grind away the spot, removing the cast iron,, and weld in a steel plate with your NI55 rod.
If the area is small enough, you could remove 1/2" of metal, and install a 1/2" thick piece of steel plate.
The steel will drill and tap easily, and accurately, and you will never have another broken casting problem.
The stress of the weld to the cast material is spread around the entire perimeter of the new steel part, the stress in the weld will then be low.
If you just weld the bolt holes, the stress on the weld will be very high,, possibly allowing the bolts to fail again.
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Re: Ni Rod 55
For what it is worth I use this stuff. Not cheap but no preheat. Welds a little dirty but just plain works. The big project a lab begged me to weld was a huge cast iron vacuum chamber hatch plate with corrosion on one side. Other shops tried and failed. We brought in this wire and it worked.
https://ezweldtigwire.com/product/ez...tig-wire-1-16/
Weld like a "WELDOR", not a wel-"DERR"
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Re: Ni Rod 55
Just wanted to update, I decided to do oxyacetylene and brass, it worked out fine. Ill probably get a piece of junk cast Iron and do some practice runs with the Ni Rod for future repairs. Thanks for everyone’s input.