mapp gas users and welding rods ???? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 03-08-2004, 07:46 AM
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mapp gas users and welding rods ????

My brother bought a mapp gas torch and some welding rods that are supposed to be used with propane, to fill in a couple small holes in the body of his blazer.

I thought mapp gas had a hotter flame than propane, yet he can't get these rods to melt with heat applied directly. I made sure they were not the arc welding rods. Any thoughts, the torch bottle says it could be used like an acetelyne torch. Any thoughts? thanks



357ford

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Old 03-08-2004, 04:39 PM
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I assume that you are talking about mapp/oxy, if not and you are trying to use an air/fuel torch then it simply will not work except for solder and lead. You are right about mapp being hotter than propane but without oxygen it is not nearly hot enough to weld with. Even with mapp/oxy setup you would not have a very good welding rig. You should forget the mapp and look into getting a good acetylene torch. What kind of rods are you trying to use? Steel? Bronze brazing rods? I will try and help if you can give a little more info.
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Old 03-08-2004, 05:12 PM
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Well all I know is they are rods that he bought at advanc auto, they are like an item sold in jcwhitney, claims you use them with a propane torch. It is a kit comes with flux and if you go to www.jcwhitney.com it is item number 81dy6150r its called welding rod kit. that about all I know. thanks


This link will take you there, it doesn't state it on the site but in the magazine it say for use with a propane torch.

http://www.jcwhitney.com/webapp/wcs/...Group&ss=10101



357ford
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Old 03-09-2004, 06:51 AM
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I tried brazing some sheet metal on an old truck with MAPP gas. The torch I used was special made for MAPP gas. It had a little venturi type doohickey that allowed ambient air into its nozzle, increasing the temperature of the flame. Didn't work out too well. You can get the brazing rod to melt and stick, but you're guaranteed to warp the metal. As far as actually welding steel rods with it, I've never heard of it.
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Old 03-09-2004, 08:36 AM
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357-What you have there is apparently a solder type metal that I would think is entirely inappropriate for body work. You might be able to fill small holes with it but I doubt it would work very well and I definitely would not want to join panels with it. If all you need to do is fill holes then you might want to check out some of the fiberglass reinforced body fillers. There is a ton of info here on that subject from some very knowledgeable people who can no doubt help you out. Also check out the knowledge base since that problem and many more are covered there.
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Old 03-09-2004, 08:50 AM
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Appreciate it fellas.

I called him yesterday to see what was going on, he took the torch back and got his money back, , I can't blame him.

What he is wanting to fill, is the screw holes left once you take the roof rack off a s-10 blazer, they are small holes, I think he picked up some bondo brand putty, that you knead and it hardens like a rock, that should work fine.

Actually what I told him to do, is take the screws, put some jb weld on the inner part of the heads, then screw them from the inside out, then cut them flush with the roof, apply a small amount of bondo and sand. Who knows what he'll do? thanks again



357ford
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Old 03-09-2004, 01:27 PM
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Actually he'd probably get by with just some bondo shoved into the holes, but the screw/JB weld idea would work for sure. I had to fix a hole in an oil pan out in the woods one time with it. I had gone over some big rocks pretty hard, so I looked under my truck and sure enough, I had a slow drip from the pan. Luckily I had a box of tools and JB weld with me. I let the engine cool, drained the oil into a plastic trash bag (I emptied out my tool box to use as support for the bag), drove a sheetmetal screw into the crack, took it back out, cleaned the hole with gasoline, then slathered JB weld on the screw and screwed it in. Poked a hole in the bag full of oil and filled it back up. I spilled some, but got most of it back in the pan. Let it set a couple hours and I was on my way. Worked good and lasted the rest of the time I had it.
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Old 03-09-2004, 05:49 PM
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Yeah he once patched an oil pan with jbweld and it lasted leak free for a few years until sold, as well. Your right it probably is overkill, no telling what he'll do anyways. later





357ford
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