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The little green tank is oxygen, the little white tank is propane. That’s my portable set, if I’m going somewhere and want torches with me.
About the only difference between oxy-acetylene and oxy-propane is with oxy-acetylene you light only acetylene first, then add in the oxygen. With oxy-propane you need to have both valves open the right amount to light it.
Well, the regulator and torch tips are different, but other than that the technique is the same once it’s lit. You can get different size tips, all that changes is flame temp and how much gas you go through.
As far as safety, I don’t consider them dangerous. Wear work boots and long pants, welding gloves and safety glasses. Depending on the angle you hold the torch dictates where the slag will land. Obviously you want to avoid having the hot slag land on flammable objects.
When it’s adjusted properly, you’ll have a bright blue centre flame near the top, and a lighter blue about 2-3” long. The bright blue is hotter and what you want to have on the metal. Once it starts to “puddle” hit the boost and cut away.
I turn both knobs off on the torch, then, if I’m done using them I turn the tanks off. I believe, if you want to do it properly, you open the torch back to drain the hoses, but I never do
The only “rule” I follow is no torch work for at least 30-45 minutes before shutting the shop down and leaving
FWIW Just got off the phone with Luke from Air Liquide in Regina. An argon tank, size 9, 1.3 cubic meters, approx 45 cubic ft, leases for 70/yr or buy for 230. A fill is 80 bucks.
Bigger tanks apparently come with a built in regulator but I didn't get a price.
That's because of fire hazard? Right?[/QUOTE]
Yep! In theory if a fire was going to start, it should’ve started in that amount of time. All of the fires I’ve started as a result of using torches started pretty much right away though
That propane oxygen setup you’ve got there will it do welding? Can you run an oxygen cutting torch ? I was told by an instructor you can’t weld with propane but he worked for one of those industrial gas suppliers so I now wonder if that was accurate.
Welding is fusing metal together by means of melting the base metal and usually adding in with filler rod. Brazing is melting a different metal material (usually brass) that sort of "glues" the pieces together. With brazing you don't melt the base material.
Welding is fusing metal together by means of melting the base metal and usually adding in with filler rod. Brazing is melting a different metal material (usually brass) that sort of "glues" the pieces together. With brazing you don't melt the base material.
So last week a welder used a tig welder on something for me, but he didn’t use any filler rod. Is that still considered welding because he basically melted the steel together? He explained that there wasn’t room or need to add any filler rod as it was thin metal and didn’t need a high strength weld
So last week a welder used a tig welder on something for me, but he didn’t use any filler rod. Is that still considered welding because he basically melted the steel together? He explained that there wasn’t room or need to add any filler rod as it was thin metal and didn’t need a high strength weld
Yup, still welding cuz he is melting/fusing the metal together. TIG welding makes a particularly nice looking weld. If I say much more I might talking past my skill/knowledge about TIG welding (I don't own a TIG welder).
Brazing seems to be kind of old school now and not done much as I think a lot of the things I would braze could be tig welded (I could be wrong on that). I still like brazing for things like cast iron or dissimilar metals (cast to steel).
The things I would have torch welded in the past (thin metals like exhaust pipe) can be done now easier (and probably better) with my MIG welder.
I'm happy to answer questions I can, but I think there are a whole lot more qualified people around this forum that are much more knowledgeable.
When I took welding we were first taught to gas weld. First without filler rod. I think it is the best way to learn puddle control. My son learnt the same way at SAIT about 10 years ago.
When I took welding we were first taught to gas weld. First without filler rod. I think it is the best way to learn puddle control. My son learnt the same way at SAIT about 10 years ago.
Ha ha that's exactly how I learned gas welding in high school also. It's good to hear that somebody still thinks it's worthwhile teaching (at least SAIT did 10 years ago). Not being super knowledgeable about all welding technologies, I kind of thought gas welding may of been old school stuff of little value today.
Ha ha that's exactly how I learned gas welding in high school also. It's good to hear that somebody still thinks it's worthwhile teaching (at least SAIT did 10 years ago). Not being super knowledgeable about all welding technologies, I kind of thought gas welding may of been old school stuff of little value today.
A buddy of mine went through welding school 2-3 years ago. He said they covered it, but oxy-acetylene only. I wonder if that’s the best teaching tool on how to form a bead? Or what it should look like?
I am also on the lookout for cheap oxy-acetylene setup or maybe oxy-propane. Torch kits used for oxy-acetylene seem cheap but the tanks usually bring price much higher.
I got one of these, works great for melting gold/ copper for ingots and small brazing. Is hard to adjust as the valves are touchy and tanks (oxy especially) empty really fast. I need a large oxy bottle to use my LP/oxy set, price hinders me from that investment
Yep! In theory if a fire was going to start, it should’ve started in that amount of time. All of the fires I’ve started as a result of using torches started pretty much right away though[/QUOTE]
The m
Yep! In theory if a fire was going to start, it should’ve started in that amount of time. All of the fires I’ve started as a result of using torches started pretty much right away though[/QUOTE]
The Mount Royal hotel in Banff burnt the top floor during roofing repairs, at 2 am the fire was spotted the fire watch had ended at 5pm (Flynn {the contractor} has a 1 hour mandatory fire watch where one employee uses a heat reader to monitor temps after everyone else has gone home, and torches off :30 before end of shift) :45 minutes is better than most give but diligence can only cover so many variables.
My local Praxair charges $75 per year to lease a K size oxygen cylinder from them. When I bought my torches (Kijiji) they came with a K cylinder for oxygen. So I keep one full as a spare, one runs out I swap them out then take the empty one in to get filled.
I’m not sure what a lease would be on a smaller tank. When I needed to do some stainless mig welding they let me “demo” a small tank, which is still sitting in the shop in a corner. I should take that back...one of these days...
