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Preventing weldoxidation
Hi,
In the TIG, MIG and MAG processes, gas is used to prevent oxidation of the weld in the puddle-phase.
In Oxy-Acetylene welding; how is the welding in that process preventing oxidation?
Oxygen is present in great volume there, so imho could cause oxidation (as it will not be used to the last molecule in burning the acetylene).
Thanks for info on this.
oldwelderman
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Re: Preventing weldoxidation
When welding with the oxy/acet process, it is the flame of an neutral flame that protects the weld from the outside air. The flame can be adjusted to be neutral, oxidizing or excess acetylene. The neutral flame is what is desired in most welds. If you are interested in this form of welding, I suggest you get a copy of either of these two books: THE OXY-ACETYLENE HANDBOOK by LIND REFERENCE LIBRARY (UNION CARBIDE) or AIRCRAFT WELDING by L.S.ELZEA. Hope this helps you. Bob
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Re: Preventing weldoxidation
Hi Bob,
Liking the post does not work, so many thanks for your clear answer and book-suggestions.
oldwelderman
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Re: Preventing weldoxidation
It is how you adjust the flame.
I use oxygen acetylene for brazing, steel and aluminum. Note aluminum is hard to torch weld.
Dave
Originally Posted by
oldwelderman
Hi,
In the TIG, MIG and MAG processes, gas is used to prevent oxidation of the weld in the puddle-phase.
In Oxy-Acetylene welding; how is the welding in that process preventing oxidation?
Oxygen is present in great volume there, so imho could cause oxidation (as it will not be used to the last molecule in burning the acetylene).
Thanks for info on this.
oldwelderman
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Re: Preventing weldoxidation
Yup neutral flame and acetylene is the only fuel gas to use a neutral flame. All the oxygen is used up in the flame and it creates a barrier (I think CO2) to keep oxygen in the atmosphere out.
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Re: Preventing weldoxidation
Originally Posted by
smithdoor
It is how you adjust the flame.
I use oxygen acetylene for brazing, steel and aluminum. Note aluminum is hard to torch weld.
Dave
Dave, ever used oxy/hydro to weld aluminum?
1XXX-6XXX alloys can be welded, not just brazed or soldered like those cheap rods sold now. Use 1XXX filler on like alloy and 4043 on everything else. It’s an old process, never hear it talked about or demonstrated anymore.
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Re: Preventing weldoxidation
They make a small torch, called a Dillon MK IV, or DHC Cobra that works very well for welding aluminum & cast iron if you know what your doing. Darn thing has a pinpoint flame & actually welds almost like a TIG welder.
https://detroittorch.com/
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Re: Preventing weldoxidation
Originally Posted by
cwby
They make a small torch, called a Dillon MK IV, or DHC Cobra that works very well for welding aluminum & cast iron if you know what your doing. Darn thing has a pinpoint flame & actually welds almost like a TIG welder.
https://detroittorch.com/
Interesting torch. I think I’ve seen them online before but never in the wild so to speak. Only oxy/hydro setups I’ve seen were regular oxy/acetylene torches like we’re used to, just running hydrogen instead of acetylene. The regulator is different as hydro is high-pressure, but you can use acetylene hoses and torches. The hydrogen flame is clean and is devoid of carbon too.
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Re: Preventing weldoxidation
It is a pretty neat torch for some things. Welding thin steel leaves an anealled weld that can be bent & shaped with no cracking on weld toes. Haven't used it much on Alu. Cutting attachment works as advertised, but I'll grab a regular torch before I'll rig this one up - it's just easier since it is already to go.
Video showing welding up the cast manifold is very interesting - I've never had an excuse to try it, but would try it 1st if I had the need to weld up something cast..
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Re: Preventing weldoxidation
Thanks for explaining how to prevent weldoxidataion and the books are really useful for me.