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MNLonnie 
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Joined: 11 Sep 2009
Location: Baxter MN
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 Topic: powder torch on cast iron
Posted: 15 Jan 2011 at 11:51pm |
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Anyone out there any good at welding cast? A friend of mine has a powder torch which is supposed to be the answer to cast welding but after 3 hours our crack is twice as long as when we started and we are thinking it's a heat issue. I'm checking Craigslist for an electric oven that the block will fit into. Any advise appreciated.
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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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Denis in MI
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Joined: 15 Sep 2009
Location: Norvell, MI
Points: 832
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Posted: 15 Jan 2011 at 11:54pm |
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Drill a hole at each end and weld slowly with either a made for cast iron rod, or you can use a wire welder, weld slowly, less that an inch at a time and let cool until you can touch it. My neighbor is a welder and has used these aproaches and had sucess on many of my cast iron things.
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1938 B, 1945 B, 1941 IB, 1949 C, 2 1938 WCs, 3 1950 WDs, 1951 WD, 2 1955 WD45, 1957 D-14
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Dave A
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Joined: 11 Sep 2009
Location: Almond Wisconsi
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Posted: 16 Jan 2011 at 6:40am |
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nickle eltrode clean and clean and take you time
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Play the game for more than you can afford to lose... only then will you learn the game.
Winston Churchill
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BennyLumpkin
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Joined: 22 Mar 2010
Location: Centre Hall, PA
Points: 2657
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Posted: 16 Jan 2011 at 7:50am |
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I've welded a few things cast with very good results....a nickle rod, weld about an inch at a time and let it cool...keep doing that and you'll be fine.
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Central PA Allis Express
1934 WC254
1945 WF
1945 WC135755
1951 WD68085
1953 WD45-150217
1957 WD45D-230744D
B110
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wi50
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Joined: 24 Sep 2010
Location: weegieland
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Posted: 16 Jan 2011 at 8:26am |
I've had good luck with a soft rod, Allstate 860. Depending on the nickel content, some cast rods can be hard, to hard. Everyone reccomends something different, I've tried a few but have really had good luck with the above one on many different grades of cast.
I've welded some things hot and others cold, cold works well if you never do much at a time, can't put much heat in the part. Weld a spot, leave it and do again in several minutes. Other things I'll get the whole part hot and weld it while keeping it verry hot, then cool it slowly and uniform by keeping a propane turkey cooker under it and wrapped in a heat blanket.
What part are you welding?
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"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"
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MNLonnie
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Location: Baxter MN
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Posted: 16 Jan 2011 at 8:30am |
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We're doing a crack in the water jacket of an Allis block. We are thinking our heat isn't consistent enough, that's why we were thinking an oven.
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Waukesha B, B, IB, G, styled WF, D15, 615 backhoe, 2-Oliver OC3's, 4 Ford Model T's, 3 Model A Fords, AV8 Coupe, AV8 Roadster, 1933 Ford Wrecker
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wi50
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Joined: 24 Sep 2010
Location: weegieland
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Posted: 16 Jan 2011 at 8:53am |
it may be tough to find an oven that big, if you can't find an oven, set the block above a turkey cooker type burner for main heat source, and then you can warm the welding area with a torch.
See if you can get a heat blanket from someone. THey are not that expensive to buy either, the one I bought years agoe was probably $40-60 and has paid for itself many times on old tractor projects.
Being the crack is already spreading, you don't have much to loose. Try welding it cold, or at room temperature, maybe just a slight bit of heat on the area. Only weld a small amount, 1/4-1/2 inch and pean it hard as soon as the arc stops. You'll be able to touch it within a short time. See if it cracks, and if not do the same thing in a few minutes. It may weld better than you think and be easier. Just keep a wire wheel handy and clean the bead and crack each time you weld.
Get some soft rod like the Allstate or a eutectic rod before you start the project again.
A friend has a powder torch we've used in the past, it's fine for some applications, but you're right, the problem is comeing from a large concentrated heat source. It will may work well if you can get the whole rest of the block up to a high temp.
Edited by wi50 - 16 Jan 2011 at 9:04am
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"see what happens when you have no practical experience doing something...... you end up playing with calculators and looking stupid on the internet"
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Gerald J.
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Joined: 12 Sep 2009
Location: Hamilton Co, IA
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Posted: 16 Jan 2011 at 9:10am |
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Midwest Cylinder Head, Nevada, IA.
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CTuckerNWIL
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Joined: 11 Sep 2009
Location: NW Illinois
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Posted: 16 Jan 2011 at 9:22am |
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Cut a 55 gal barrel in half long ways. Make legs to keep one half sitting open side up and level. Fill it with charcoal and light it. When the charcoal gets going good, put the block in and cover with the other half. It makes a cheap and good working oven for heating up welding projects.
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