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welding cast iron

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Old Jun 27, 2008 | 10:50 AM
  #1  
Racintweek's Avatar
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Default welding cast iron

the bosses dad asked me to try and repair his MGB manifold and its cast iron (not steel)
any hints tips suggestions??


i know to preheat but any other info
Old Jun 27, 2008 | 01:06 PM
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Default Re: welding cast iron

Preheat, weld it hot, then cool it slowly (sand or something) if you can.
Old Jun 27, 2008 | 01:23 PM
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Default Re: welding cast iron

Originally Posted by Snafubmx234
Preheat, weld it hot, then cool it slowly (sand or something) if you can.
x2
Old Jun 27, 2008 | 02:31 PM
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Default Re: welding cast iron

anneal that ---- x3
Old Jun 27, 2008 | 03:01 PM
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Default Re: welding cast iron

keys to iron success:
  • if cracked, drill out the ends of the cracks so they do not continue to run
  • preheat the entire piece evenly to 450*F+
  • make small stich welds 3/4-1" long
  • peen the weld area after each-every few weld beads while very hot to help relieve stress.
  • use the correct nickle filler be it stick, gmaw, fcaw or tig. don't weld cat iron with steel filler own up $5 for a single rod or two of the correct stuff. most suppliers will give you a rod or few for afew dollars. (nickle filler is fairly expencive btw)
  • do not let the piece cool rapidly. use a welding blanket or a bucket of sand to control the cooling. do not mess with i for 48 hours
Old Jun 27, 2008 | 03:02 PM
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Default Re: welding cast iron

cast iron relaly isn't hard. it just takes along time to do it right. pre/post heat control, peening, filler. if you take your time youll never have a problem.
Old Jun 27, 2008 | 10:26 PM
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Default Re: welding cast iron

just crank up the welder to high and lay that ---- on.
Old Jun 28, 2008 | 01:46 PM
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Default Re: welding cast iron

make him a log manifold so he can boost that beeyotch
Old Jun 29, 2008 | 10:57 PM
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Default Re: welding cast iron

drill the crack out bigger for welding a tial flange to.

im a welding noob. what's peening? You mean like hammering. nm, looked it up

FYI
tr.v. peened, peen·ing, peens
To hammer, bend, or shape with a peen
Old Jun 30, 2008 | 06:13 PM
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Default Re: welding cast iron

thr prob i had was as soon as i put heat to it it started spittting ---- everywhere



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