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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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Joining Aluminum without a TIG
I'm kinda thinking of making a model airplane muffler or two. These
days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#2
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
On 2010-09-13, Tim Wescott wrote:
I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. You can weld aluminum with O/A. i |
#3
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Joining Aluminum without a TIG
On Sep 12, 8:13*pm, Tim Wescott wrote:
These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. *See some examples hehttp://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. *But it'll all be aluminum, so how to join the pieces? Tim Wescott Wescott Design Serviceshttp://www.wescottdesign.com Could you use machine screws to hold the header to the front machined end? And then run a threaded rod through the tube to hold the machined ends. Or use lost wax casting to make it as one piece. Dan |
#5
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Joining Aluminum without a TIG
On 09/12/2010 05:57 PM, Snag wrote:
wrote: On Sep 12, 8:13 pm, Tim wrote: These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples hehttp://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? Tim Wescott Wescott Design Serviceshttp://www.wescottdesign.com Could you use machine screws to hold the header to the front machined end? And then run a threaded rod through the tube to hold the machined ends. Or use lost wax casting to make it as one piece. Dan That could be cast with a simple core . For that matter , if it's one that has the inlet port at 90° to the main muffler , cast it as a solid , machine the interior , cap the front with a threaded dome . Built an R/C boat once upon a time . While I was saving up for the radio gear it "got broke" . Long story ... You would have to suggest that. And here I have a Vibration & Stratton engine that's just crying out to be broken into bits and recycled as all sorts of nifty stuff. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#6
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Joining Aluminum without a TIG
On Sun, 12 Sep 2010 22:19:57 -0700, Tim Wescott
wrote: You would have to suggest that. And here I have a Vibration & Stratton engine that's just crying out to be broken into bits and recycled as all sorts of nifty stuff. You meant to say "Briggs and ScrapEm" engine, right? -- Not merely an absence of noise, Real Silence begins when a reasonable being withdraws from the noise in order to find peace and order in his inner sanctuary. -- Peter Minard |
#7
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
"Tim Wescott" wrote in message ... I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. I've used aluminum solder with success. The hard part is to keep the base aluminum from forming an oxide coating before the solder flows. I don't know what the solder metal is but my file tells me it is harder than aluminum. I bought the rods at ace HW which were similar to these. http://www.plumbersurplus.com/Prod/B...u=313530363035 Art |
#8
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
"Tim Wescott" wrote in message ... I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html I have done just a little aluminum brazing. The tricky thing is that it does not flow into gaps (unless there is a technique using flux I do not know about). You scrape the surface with the rod and it will stick where scraped. You can also deposit a blob and then spread it as you scrape with a screwdriver or wire brush. You can tin both sides before assembling and then press together while melting. Be very careful about melting the parts themselves. The braze melting point is only slightly lower than the aluminum. |
#9
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Joining Aluminum without a TIG
--FWIW try making a model engine muffler using wood and epoxy; I've
seen it done and the accoustics are ...interesting. -- "Steamboat Ed" Haas : Beauty times brains Hacking the Trailing Edge! : is a constant.. www.nmpproducts.com ---Decks a-wash in a sea of words--- |
#10
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
On Sep 12, 5:13*pm, Tim Wescott wrote:
I'm kinda thinking of making a model airplane muffler or two. *These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. *See some examples hehttp://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. *But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? *What sort of selection do I have as far as difficulty vs. results goes? *Brands to look for? *Avoid? * Places to get stuff? *I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. -- Tim Wescott Wescott Design Serviceshttp://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details athttp://www.wescottdesign.com/actfes/actfes.html Hi, Tim. JB Weld will easily take 650 degree F. Will change color, though. Paul |
#11
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
Tim Wescott wrote:
I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. I have welded a LOT of aluminum with O/A. Just need to use the same allow for filler as you have for sheet stock. O/A was the preferred method for joining a lot of aluminum items for years. Once you get it down as a skill it's a LOT of fun. Plus with the O/A you can easily remove stresses in the finished product. -- Steve W. (\___/) (='.'=) (")_(") |
#12
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Joining Aluminum without a TIG
On 09/12/2010 08:05 PM, Steve W. wrote:
Tim Wescott wrote: I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. I have welded a LOT of aluminum with O/A. Just need to use the same allow for filler as you have for sheet stock. O/A was the preferred method for joining a lot of aluminum items for years. Once you get it down as a skill it's a LOT of fun. Plus with the O/A you can easily remove stresses in the finished product. Part of the reason I want to braze is because I have a lot of odds and ends that aren't necessarily going to be easy-to-weld alloys, no matter how nice they are to machine. But I'll leave your suggestion in the back of my mind -- it's a good one, and if there are such I can just stock up on alloys that are easy to both weld and machine. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#13
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
On 09/12/2010 05:13 PM, Tim Wescott wrote:
I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. Update: the local welding shop has an aluminum soldering kit and aluminum brazing flux, but was out of aluminum brazing rod. They had some zinc-alloy rod that may or may not have worked with the aluminum brazing flux, in a size way bigger than my job. So I got the soldering kit. I'm going to see how well the soldering process works -- if it seems almost but not quite strong enough then I'll try brazing, if it works a charm I won't change. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#14
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Joining Aluminum without a TIG
On Tue, 14 Sep 2010 14:06:46 -0700, Tim Wescott
wrote: On 09/12/2010 05:13 PM, Tim Wescott wrote: I'm kinda thinking of making a model airplane muffler or two. These days the things are generally cast in one piece -- but that isn't going to work for a one-off. These things have a header that comes off of the engine, then goes into a tube-shaped expansion chamber. See some examples he http://www.mecoa.com/kb/aero/aircraft.htm I'm thinking that I can fabricate one of these with a machined header, machined ends, and a section of tube. But it'll all be aluminum, so how to join the pieces? I'm assuming that JB weld won't take the heat and will just fall off. But I'm ready to be corrected. I don't have a TIG welder, or I'd just select TIGable materials and be happy. I do have an oxy-acetylene set, and I certainly know how to solder. So -- will aluminum brazing work on this? What sort of selection do I have as far as difficulty vs. results goes? Brands to look for? Avoid? Places to get stuff? I'd like something that's going to be as strong (or nearly so) as the parent material and that can be done on a welding bench with a torch and a vise. TIA. Update: the local welding shop has an aluminum soldering kit and aluminum brazing flux, but was out of aluminum brazing rod. They had some zinc-alloy rod that may or may not have worked with the aluminum brazing flux, in a size way bigger than my job. So I got the soldering kit. I'm going to see how well the soldering process works -- if it seems almost but not quite strong enough then I'll try brazing, if it works a charm I won't change. I've got about 3 lbs of AluSol sitting in the garage - flux cored solder for aluminum. |
#15
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Joining Aluminum without a TIG
"Tim Wescott" wrote in message ... Update: the local welding shop has an aluminum soldering kit and aluminum brazing flux, but was out of aluminum brazing rod. They had some zinc-alloy rod that may or may not have worked with the aluminum brazing flux, in a size way bigger than my job. So I got the soldering kit. I'm going to see how well the soldering process works -- if it seems almost but not quite strong enough then I'll try brazing, if it works a charm I won't change. -- Tim Wescott As you have an OA torch it seems to me that if you use a reducing flame the aluminum will have less of an opportunity to form an oxide coating and may solder easier. Expert opinion anyone? Art |
#16
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Joining Aluminum without a TIG
On 09/14/2010 06:08 PM, Artemus wrote:
"Tim wrote in message ... Update: the local welding shop has an aluminum soldering kit and aluminum brazing flux, but was out of aluminum brazing rod. They had some zinc-alloy rod that may or may not have worked with the aluminum brazing flux, in a size way bigger than my job. So I got the soldering kit. I'm going to see how well the soldering process works -- if it seems almost but not quite strong enough then I'll try brazing, if it works a charm I won't change. -- Tim Wescott As you have an OA torch it seems to me that if you use a reducing flame the aluminum will have less of an opportunity to form an oxide coating and may solder easier. Expert opinion anyone? AFAIK that would only slow things down. Keep in mind that aluminum is so electronegative that it'll reduce rust back to iron, and produce enough heat in the process to melt the iron to steel (think "thermite welding"). I don't know if it can reduce CO or CO2, but I wouldn't be surprised. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html |
#17
Posted to rec.crafts.metalworking
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Joining Aluminum without a TIG
"Tim Wescott" wrote in message news As you have an OA torch it seems to me that if you use a reducing flame the aluminum will have less of an opportunity to form an oxide coating and may solder easier. Expert opinion anyone? AFAIK that would only slow things down. Keep in mind that aluminum is so electronegative that it'll reduce rust back to iron, and produce enough heat in the process to melt the iron to steel (think "thermite welding"). I don't know if it can reduce CO or CO2, but I wouldn't be surprised. -- Tim Wescott That's a good point. I don't know either but it would be easy and quick to test. Art |
#18
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Joining Aluminum without a TIG
On Wed, 15 Sep 2010 14:27:24 -0700, "Artemus"
wrote: "Tim Wescott" wrote in message news As you have an OA torch it seems to me that if you use a reducing flame the aluminum will have less of an opportunity to form an oxide coating and may solder easier. Expert opinion anyone? AFAIK that would only slow things down. Keep in mind that aluminum is so electronegative that it'll reduce rust back to iron, and produce enough heat in the process to melt the iron to steel (think "thermite welding"). I don't know if it can reduce CO or CO2, but I wouldn't be surprised. -- Tim Wescott That's a good point. I don't know either but it would be easy and quick to test. Art The zinc type alubraze rods work pretty good - I've used "3.4.1 ideal rod" from amrelle Sales in Whitby Ontario to make canoe racks, bicycle racks tor the back of my camper trailer and a bunch of other stuff and have never had a joint failure. |
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