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  #11  
Old 10-27-2023, 11:32 AM
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I never made it far enough into my searching to actually purchase a torch setup. I got distracted (and fulfilled) with plasma cutters. There are plenty of times that I could have used a torch system for heating/bending but I just found other ways to accomplish it--usually by redesigning the project.

That said to explain my otherwise complete lack of experience, I was visiting an acquaintance who had a propane setup vs the acetylene and was very impressed. To my novice brain it seemed to offer a similar result with fewer complications. Propane was readily available, could be transported easier, didn't seem as dangerous, and the initial buy-in was similar if not cheaper. There were some small details like the different tips and hoses that I'd read about but I've long since forgotten. Thankfully others know way more in that regard.

If I were to ever need the process, I think I'd still prefer it. But I'm not that ambitious and it's unlikely I'll ever have a clean enough space to use a torch safely.
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  #12  
Old 10-28-2023, 07:53 AM
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Quote:
Originally Posted by Shade Tree Welder View Post
Propylene is a good option.
Not all LWS stock propylene. Depots Local to me do not.
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  #13  
Old 10-28-2023, 03:08 PM
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Well, today I decided to find out if I have any welding tips and torture them if I did. I found two that I had not given away or used as a base for a rosebud pipe.

They are Victor #3 and #5 tips. So I gave it the evil eye and decided to drill out the tips. I drilled #3 with a #45 drill bit to approximately the depth of the bit width and tried it out. Well, it worked and I had a stable flame with propane. I did not want to go too deep as then the flame would be into the recess, so I quit at that point. Then while putting it away, I found the #5 tip and decided to drill it to a #31 drill size and went in about a bit less than 1/8".
It's very scientific but it works, the #5 tip is very smooth and hot without blowing out if you wind up the oxygen. Easy to light too.

I don't know why this works, I'm gonna guess that the recess allows the laminar flow to remain shielded so the flame gets to it before turbulence starts, and outside air gets into the mixture.
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  #14  
Old 10-28-2023, 08:49 PM
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Quote:
Originally Posted by Ironman View Post
Well, today I decided to find out if I have any welding tips and torture them if I did. I found two that I had not given away or used as a base for a rosebud pipe.

They are Victor #3 and #5 tips. So I gave it the evil eye and decided to drill out the tips. I drilled #3 with a #45 drill bit to approximately the depth of the bit width and tried it out. Well, it worked and I had a stable flame with propane. I did not want to go too deep as then the flame would be into the recess, so I quit at that point. Then while putting it away, I found the #5 tip and decided to drill it to a #31 drill size and went in about a bit less than 1/8".
It's very scientific but it works, the #5 tip is very smooth and hot without blowing out if you wind up the oxygen. Easy to light too.

I don't know why this works, I'm gonna guess that the recess allows the laminar flow to remain shielded so the flame gets to it before turbulence starts, and outside air gets into the mixture.
This is interesting Gerry I have not gas welded in close to 35 years. Last time I did it was in the Fab shop in the 80's when we had a contract to fix frames for Dana Corp ?? But, if it can be done with propane that is intriguing. Everyone always told me it required Oxy-Acetylene. Funny Fucking story one of our welders went on break. One of the guys grabbed his goggles and sprayed them with flat black touch up paint for the frames. He looked back and forth a couple times and basically didn't know WTF was going on. We were fucking dying laughing .
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  #15  
Old 10-28-2023, 09:21 PM
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I mostly always use the torch for heating. I wish I had done this last week when I needed pinpoint fire to flame straighten a dent.
Most of my cutting and all my welding is electric. Any torch that can make a molten puddle can weld, be it tig or other heat source. Shielding from oxygen is as simple as backing the flame away from the weld til it is down to red heat.
Tomorrow is rosebud time. I want to pull the temper on a CAT40 3/4" adapter and drill and tap in the right spots to use weldon shank cutters
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  #16  
Old 10-28-2023, 09:31 PM
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I have a smith Medium duty torch kit set up for propane. I like it. It isn't as easy to get nice cuts as it is with acetylene but it isn't bad at all.

It does get hot enough to melt steel, but what they told us in welding class is that that it doesn't burn the oxygen off clean enough to have a neutral flame and give you clean welds. I can't remember if the acetylene has more carbon or more hydrogen (maybe both, I won't pretend I'm good at chemistry) but there is too much oxygen left free to ruin the weld puddle.

I should invest in some more tips for my torch. I don't remember what number is in it but it is really meant for cutting stuff between 1/2 inch and an inch and doesn't make the nicest cuts on thinner stuff.
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  #17  
Old 10-29-2023, 12:59 AM
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Quote:
Originally Posted by Matt Shade View Post
I should invest in some more tips for my torch. I don't remember what number is in it but it is really meant for cutting stuff between 1/2 inch and an inch and doesn't make the nicest cuts on thinner stuff.
I have a light/med duty Victor torch O/A torch set. I bought a 00 and 000 tips for pinpoint heating of manifold studs etc. and it works great for that. I think I go up to 3 in the opposite direction but who the fuck gas welds nowadays?

Never got around to getting a rosebud tip for it as when I do need one, I'll just use the cutting tip and just not press the "cut" lever. My go to for cutting metal is the plasma...

And as Gerry mentioned, a TIG can be wonderful for warming metal...
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  #18  
Old 10-29-2023, 01:55 PM
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Has anyone mentioned propylene?
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  #19  
Old 10-29-2023, 02:38 PM
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Default Oxy/propane torches

Quote:
Originally Posted by Shade Tree Welder View Post
Has anyone mentioned propylene?

Yes, you have, and has been mentioned, that is not always available in all locations.

Now that you brought it up, will propylene bring a neutral flame so you can gas weld?

I think my dad tried it one time, and he didn’t notice any difference in cutting up boilers for scrap. Went back to propane, as it was cheaper.
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  #20  
Old 02-03-2024, 01:53 PM
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I know that this is a bit of an old thread, but has anyone tryed a small piece of tubing that fits tight over the welding tip to shield the propane flame a bit. I also recall that propane only torches had a blend valve for lighting, just a bit of oxy with the start up propane, I too have a plasma torch but just a thought on the tubing
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