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I actually joined the forum just to ask this question. I have tried using the largest tip that will fit my medium duty victor torch, and I have the largest tanks I could buy. The problem is that I can't get a puddle to form on the plate before the 1 inch diameter tube melts entirely. I am directing the heat well away from the tube as well. I even tried pre-heating the plate to just before it began to liquify. 5 attempts thus far.Is inability to weld dissimilar thickness of steel a limitation of oxy-fuel or am I missing something? Thank you.
Reply:How thick is the tube?And sorry to ask a dumb question but: the plate and the tube are steel, right?Welcome to the forums, btw!
Reply:Not a dumb question - both are steel. I am at work presently, but I'd estimate the thickness of the tube wall to be roughly 1/8" to 3/16". Likely closer to 1/8".
Reply:Originally Posted by nipon621I actually joined the forum just to ask this question. I have tried using the largest tip that will fit my medium duty victor torch, and I have the largest tanks I could buy. The problem is that I can't get a puddle to form on the plate before the 1 inch diameter tube melts entirely. I am directing the heat well away from the tube as well. I even tried pre-heating the plate to just before it began to liquify. 5 attempts thus far.Is inability to weld dissimilar thickness of steel a limitation of oxy-fuel or am I missing something? Thank you.
Reply:While I'm sure it would be possible to do that my big question would be "why" you'd ever want to spend that much time and effort trying to do it. Stick or MIG would give you so much better results with so much less effort and aggravation.
Reply:Brazing may be a simpler method when you want to join diffrent thickness metal using O/A. You are nowhere near the melting point of steel, so more room for "mistakes" - although you want them both to be roughly the same temperature for brazing. You may heat the plate some distance away from the tube, or on the back side first.Last edited by G-son; 07-10-2014 at 05:50 PM.
Reply:This is for a tool that sits in the hardy hole of an anvil - I doubt brazing will hold up to much blacksmith work, but then again I may be wrong. A mistake would not be catastrophic. This is a hobby for me - it isnt a piece for a customer.The reason I am trying to go through the effort is because I have an oxy-acetylene torch and not a mig, tig or stick welder. This is the point where I really really wish I had just decided on getting a stick welder and a bunch of cut off disks instead of going for the "I can do anything with oxy-acetylene" line of reasoning. I have honestly thought about just taking car batteries and using them to stick weld like they do in some third world countries. On the other hand, I would like to continue living with all my organs intact and welding with car batteries makes me kind of nervous.
Reply:Stick welders are a dime a dozen on Craigslist. Look for a Miller Thunderbolt ac/dc or a Lincoln 225 for about $150Miller Syncrowave 350Millermatic 252/ 30A spoolgunMiller Bobcat 225g w/ 3545 spoolgunLincoln PowerArc4000Lincoln 175 Mig Lincoln 135 Mig Everlast 250EX TigCentury ac/dc 230 amp stickVictor O/AHypertherm 1000 plasma
Reply:I have only a little experience gas welding (but I've enjoyed it when I've tried it). Is it possible or practical to somehow shield the tube from the flame while puddling on the plate? Or maybe apply clamps on the tube to act as heat sink?
Reply:I have to admit I'd stick weld it because I can but in your shoes I'd find a piece of 1" square solid bar and weld that cause I don't see that tube taking the beating for very long either if you do manage to get it welded.---Meltedmetal
Reply:I guess the batteries would work but by the time you buy enough cable to get a safe distance from the batteries so you don't blow them up(acid baths really suck even if the shrapnel doesn't get you) you could buy a cheap stick machine. Ive seen Lincoln 225s around here for $75.00 but it depends on where you can get to easily.---Meltedmetal
Reply:+1 to what Bistineau said. Your using Oxy-Acetylene correct? Not Oxy-Propane, which is only for cutting. Hate to ask the obvious... your using a welding tip and not a cutting nozzle? What tip are you using? Make sure the flame is neutral. Make sure your gas isn't turned up too high. The 1/2" plate will puddle even with a small tip given time. A smaller tip may give you more control. Build your puddle on the plate and then lap filler to the tube. I'd try a #2 with about 3 psi which is the size I'd normally use for 1/8" wall pipe.
Reply:I will give the pre-puddle idea a shot and let you know. If it doesnt work, then I guess my conclusion will be that oxy-fuel welding cannot join two metals of substantially different thickness - at least not without a heat sink. Thank you for the warm welcome!
Reply:I tried a #2 and a #3, and then either a #5 or a #7 - the plate just was not getting hot enough. Maybe I need to put it on firebrick instead of in a vice. Kinda stupid to use a vice now that I think about it. It was a huge post vice too so it probably sucked up all the heat I put into the plate. Those things are awesome by the way - they weigh at least 50 lbs and usually stand 3 feet tall.
Reply:I hope this isn't a structural weld....
Reply:Originally Posted by nipon621This is for a tool that sits in the hardy hole of an anvil - I doubt brazing will hold up to much blacksmith work, but then again I may be wrong.
Reply:Originally Posted by nipon621This is for a tool that sits in the hardy hole of an anvil - I doubt brazing will hold up to much blacksmith work, but then again I may be wrong. A mistake would not be catastrophic. This is a hobby for me - it isnt a piece for a customer.The reason I am trying to go through the effort is because I have an oxy-acetylene torch and not a mig, tig or stick welder. This is the point where I really really wish I had just decided on getting a stick welder and a bunch of cut off disks instead of going for the "I can do anything with oxy-acetylene" line of reasoning. I have honestly thought about just taking car batteries and using them to stick weld like they do in some third world countries. On the other hand, I would like to continue living with all my organs intact and welding with car batteries makes me kind of nervous.
Reply:Originally Posted by nipon621I will give the pre-puddle idea a shot and let you know. If it doesnt work, then I guess my conclusion will be that oxy-fuel welding cannot join two metals of substantially different thickness - at least not without a heat sink. Thank you for the warm welcome!
Reply:The last time I helped a buddy make a hardy tool we used solid square bar. I put a 3/8 bevel all around the square bar and welded it up with a 110 Lincoln MIG welder using self shielded flux core. Preheated with the torch some where around 200 to 300 F. before welding. Dressed the weld with a grinder so that there was no weld (fillet) sticking out that would keep the tool from sitting all the way down in the hardy hole. He's been using it for at least 5 years with out problem.
Reply:With the thin wall tube you are going to have a lot of problem controlling heat on the edge of it. There's only one direction for heat to be absorbed so it's going to heat up and melt very quickly. The idea of doing a puddle on the plate will help but once you join the tube at one spot, it's going to be hard to work your way around and keep the puddle "alive" on the plate without melting back the edge of the thin wall tube.One way to help the situation is to orient the plate and tube so that the tubing edge is at the bottom (lower, closer to the ground) than the plate. Ideally, you would try to weld this overhead with the plate flat above you and the tube clamped hanging below. If not that, at least have the plate sitting vertical and the tubing oriented off horizontally. Then you can do some tacks at the corners, flip it and tack again. Then start working your way in very short runs, letting the tubing cool between.Basically what I'm trying to describe is letting the heat work for you - heat rises, so keep the thin edge lower than the thick plate. Also, do it in very short runs and let the tube cool.Or you can use square bar instead of tubing. Or much thicker tubing. But with OA you'll be using a lot of gas to get there. Make sure your acetylene tank is big enough to handle the flow rates your tip is using up or you risk liquid acetone flowing out the tank...
Reply:Drill a hole in a 1 x 1 x 1/8 piece of plate.Stick a 1/4 x 20 bolt cut to 1/2" of threads through the hole and weld it in place. Weld that to the bottom of the tube "dikk stikkin out". Drill and tap the the plate.Screw it in.Flip it over and fill the hole with weld. OR...... Grab a hot MIG and be done in 10 seconds. Bubble gumTooth pixDuct tapeBlack glueGBMF hammerScrew gun --bad battery (see above)
Reply:They welded aircraft together ,just practice I never did it but want to. |
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发表于 2021-8-31 23:06:07