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Cast iron welding info

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al

02-01-1999 19:42:36




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I'm a structural,pipe welder but want some input
on cast ironwelding,brazing. Particularly with a
oven for preheat. Preheat temp.,cool rate etc.
Any Ideas on building a gas oven 24x24x24'.




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Johnbob

02-06-1999 16:46:47




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 Re: Cast iron welding info in reply to al , 02-01-1999 19:42:36  
I weld cast with a torch,heat it up slow and after welding bury it in powerd lime for 24 hrs.I haven't lost one yet.



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Joe Fabregas

02-09-1999 17:47:59




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 Re: Re: Cast iron welding info in reply to Johnbob, 02-06-1999 16:46:47  
Where do you get your flux/rods. What I have are probably 40+ years old. Thanks, Joe Fabregas jfabregas@aol.com



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Joe Fabregas

02-03-1999 16:18:43




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 Re: Cast iron welding info in reply to al , 02-01-1999 19:42:36  
This can be pretty deep, more than I could ever do in a paragraph. Check your community college or tech school for adult ed welding courses. Get some books from a library. Lincoln Electric has some SUPER classes and some great books. Not familiar with the Cronatron rods. There are many specialty rod makers. They work good but are really expensive. For arc there is a steel-for-cast rod that's hard when done, nichol which works great, is machineable and forgiving with stresses but expensive(maybe 3 rods for 5-7 bucks). And stick brazing rods that are easy to use, expensive, and allow joining different materials. I repaired a rr jack with new steel pieces brazed on. You can oxy-acet weld it with cast flux and cast rods, takes some practice. Gas brazing works but can be tricky especially if any oil/grease is in the cast. The carbon in the cast can give you fits too. Small parts can be pre/post heated in a furnace, I prefer a rose-bud. Bring it up slow & even and down slow & even to prevent warping/stressing. Do

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chuck

02-06-1999 14:59:26




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 Re: Re: Cast iron welding info in reply to Joe Fabregas, 02-03-1999 16:18:43  
I was pleased with that cronatron stuff too. The guy who peddles it warned not to use aluminum oxide grinding wheel to prepare the joint, claimed that the Al. would interfeer with the weld chemestry, use a carbine burr instead. Just passing it along.



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Joe Fabregas

02-09-1999 17:45:53




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 Re: Re: Re: Cast iron welding info in reply to chuck, 02-06-1999 14:59:26  
Is the finished bead just like the parent metal, gray cast? How's the cost? Thanks, Joe Fabregas jfabregas@aol.com



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bj

04-24-1999 05:54:05




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 Re: Re: Re: Re: Cast iron welding info in reply to Joe Fabregas, 02-09-1999 17:45:53  
send me more info on welding



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Paul Fox

02-02-1999 03:24:45




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 Re: Cast iron welding info in reply to al , 02-01-1999 19:42:36  
You might find the information at the link below interesting.



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Jay

03-18-1999 21:49:45




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 Re: Re: Cast iron welding info in reply to Paul Fox, 02-02-1999 03:24:45  
When using arc rod on cast iron, don't just lace
it up as you would steel. And don't pre heat.
Weld in random spots about 1" long. Take your ball peen hammer(this is what that round part is
for, for all you who have wondered.) and tap along the center of the bead hard enough to spread the metal as soon as you break the arc.
this lessens the tendency for the cooling weld
bead to shrink away from the base metal. I was always taught to never let the casting get too
hot for you to touch. Do this until all your 1" long beads come together to form one bead. I have used this method every day for 20+ years,
and it will work.

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Garry

09-03-1999 16:28:14




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 Re: Re: Re: Cast iron welding info in reply to Jay, 03-18-1999 21:49:45  
I have a question concerning arc welds on old/antique cast iron. My first worry is that the old material will be brittle and not hold or worse, shatter. Will old castings act much the same as new material? Should any special steps be taken to prepair the piece?



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Steve

09-23-1999 17:41:14




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 Re: Re: Re: Re: Cast iron welding info in reply to Garry, 09-03-1999 16:28:14  
As someone who has worked with shops and manufacturers for over 21 years I have been asked countless times about welding all sorts of things cast iron. Arc welding with SMAW process (Stick) or GMAW (M.I.G.) is done in one of 2 ways. Filler metals ranging from nickel alloys to copper alloys are used depending on desired weld characteristics. There are 2 techniques. Cold welding, (For SMAW use a 3/32" dia. electrode and lay stringer beads.) wherein the backstep method is employed. Each bead is subsequently peened to relieve residual stress and the part is never allowed to get too hot to touch. The next procedure will also apply to brazing torches using rods or powders. This method requires a preheat of 300*F soaked for small sections with interpass temperatures not exceeding 500*F. Cover with vermiculite, sand or some other insulating material until cool. For large sections preheat to 800*F soaked. Brush area with a stainless steel brush and weld quickly. Get the part back up to temperature. Hold until soaked. Ramp down gradually until part cools to 150*F. Feel free to contact me if I can be of further assistance.

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