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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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Propane torches
I could weld once - about 50 years ago - but have lost the art. I now
need to do some brazing, but cant justify expensive kit. Here in the UK there a lot of plumbers torches, and you have to be careful about getting the right one for brazing. MAPP gas is OK apparently, but costs an arm and a leg, so I want to stick to propane. It appears that propane torches running at about 4 bar get hot enough without an air supply. Does any one know if this is correct please? What are the respectable makes? Rothenberger seems to be around a lot. What about Silverline or Bullfinch?? Any ideas welcome. David B. |
#2
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Propane torches
wrote in message ups.com... I could weld once - about 50 years ago - but have lost the art. I now need to do some brazing, but cant justify expensive kit. Here in the UK there a lot of plumbers torches, and you have to be careful about getting the right one for brazing. MAPP gas is OK apparently, but costs an arm and a leg, so I want to stick to propane. It appears that propane torches running at about 4 bar get hot enough without an air supply. Does any one know if this is correct please? What are the respectable makes? Rothenberger seems to be around a lot. What about Silverline or Bullfinch?? I do small brazing jobs with a "swirl-torch" - it has a vane-shaped gizmo just after the orifice that creates a vortex and it is hot enough with regular propane, at the pressure it come out of a small bottle. The bottle gets cold quickly though, and does not last long. It's for small parts only... |
#3
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Propane torches
A plain fuel torch, be it propane, butane, MAPP, or gasoline, fuel, is
not really suitable for BRAZING work. Now then, I'm sure there are some minor exceptions, but I stand behind my assertion! If you can live with silver soldering (also called silver brazing, now), that is different and doable with a fuel-only torch. The fit-up requirements are more stringent for silver soldering, however. The HANDY AND HARMAN definition for the various temperature ranges for joining is as follows: Soft soldering (typically plumbing, electric, electronic, 400 to 700 deg. F. Silver soldering, 1100 to 1500 deg. F. Brazing, 1600 to 1800 deg. F. Welding, above 1800 deg. F. (with the exception of aluminum) A fuel-only torch would have a difficult time holding an exposed work piece at 1600 deg. F and above, which is a cherry red colour. If you were to enclose the work piece in insulating material that would change things; but heating it up with a torch in the open, applying filler material in the open, would be a frustrating experience. To a large measure it depends on the size of the work you wish to do. For jewellry sized work brazing with fuel-only torch may be OK as stated by others.......anything larger....model engineering sized....would require oxy-fuel for satisfactory brazing. Trust this helps a little. Wolfgang |
#4
Posted to rec.crafts.metalworking
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Propane torches
On 23 Mar 2006 05:31:44 -0800, "
wrote: I could weld once - about 50 years ago - but have lost the art. I now need to do some brazing, but cant justify expensive kit. Here in the UK there a lot of plumbers torches, and you have to be careful about getting the right one for brazing. MAPP gas is OK apparently, but costs an arm and a leg, so I want to stick to propane. It appears that propane torches running at about 4 bar get hot enough without an air supply. Does any one know if this is correct please? What are the respectable makes? Rothenberger seems to be around a lot. What about Silverline or Bullfinch?? Any ideas welcome. David B. David, have a look at: http://members.optusnet.com.au/terry...herBurner.html http://members.optushome.com.au/terr.../BigMongo.html http://www.abana.org/ronreil/ezburner.shtml http://www.warnerknives.com/propane_forge.htm (this one look down near bottom of page) build your own burner from the ironmonger's, if they still have such a beast in the UK. Mike in BC |
#6
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Propane torches
Jeffry Wisnia wrote:
"If you happen to have or can get ahold of a "buzz box" stick welder, you could get a carbon arc torch...I've heard some guys say they made their own cheaply by following plans like these:" Of course, Don Meador also has a second book on building a water resistor, for operating a carbon arc torch without an arc welder, and yet a third book on salvaging carbon rods from old batteries. I haven't yet bought these books, though they are high on my list for future purchases: http://www.lindsaybks.com/bks8/meador/index.html Mike Mandaville |
#7
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Propane torches
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#8
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Propane torches
More information on what you are trying to do would help. Propane will
work for silver brazing and for brazing copper with Silphos. The size of the object makes a big difference as well as using insulating firebrick or something to keep the object from losing heat. Dan wrote: I could weld once - about 50 years ago - but have lost the art. I now need to do some brazing, but cant justify expensive kit. Here in the UK there a lot of plumbers torches, and you have to be careful about getting the right one for brazing. MAPP gas is OK apparently, but costs an arm and a leg, so I want to stick to propane. It appears that propane torches running at about 4 bar get hot enough without an air supply. Does any one know if this is correct please? What are the respectable makes? Rothenberger seems to be around a lot. What about Silverline or Bullfinch?? Any ideas welcome. David B. |
#9
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Propane torches
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#11
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Propane torches
Jeff Wisnia wrote:
wrote: If you happen to have or can get ahold of a "buzz box" stick welder, you could get a carbon arc torch. I've had one for several years for those "once in a while" brazing jobs larger than I can do with a propane swirl torch and a few firebricks to keep the heat contained. I never got around to springing for a full oxy-acetylene rig. You gotta wear a welder's helmet when using it, but it "do work". I've got the same arc torch. I took a welding lens and rigged up a holder for it so it attaches to the arc torch. One thing I didn't like using a helmet was I couldn't see the steel colors as it heated up. Before I knew it, the steel started melting. This new way, I just move the lens out of the way to peek to see how the colors are running. -- --Marc |
#12
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Propane torches
On Fri, 24 Mar 2006 03:21:00 -0600, Richard J Kinch
wrote: writes: Any ideas welcome. If you wanna braze large items on the cheap, make your own Reil burner. It's all about BTUs. Right. And they don't require 4 bar. 20 PSI (1.35 bar) is ample. I think Ron Reil said he brazed two cannonballs together with a Reil burner. http://ronreil.abana.org/design1.shtml |
#13
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Propane torches
I can silver solder for the most part - but when I was bronze brazing - the bronze
absorbed some iron in the steel - and the alloy turned hard and high temp. That is when I changed to a 30 gal. Propane and a tall Oxy bottle. That melted the hard and high temp alloy and continued the job. Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member Gerald Miller wrote: On Fri, 24 Mar 2006 00:12:02 GMT, (Doug White) wrote: To a large measure it depends on the size of the work you wish to do. For jewellry sized work brazing with fuel-only torch may be OK as stated by others.......anything larger....model engineering sized....would require oxy-fuel for satisfactory brazing. As a point of reference, I had no trouble silver soldering loops of 1/8" diameter SS rod to the back of a 3" diameter 1/1" thick SS disk with a standard propane torch. I had it parked on a firebrick, which tends to reflect the heat back towards the work. Doug White Small items, or sheet steel, I have no problem brazing with a turbo torch, and now that I have two of them,I could probable do larger items. My favorite though remains silver solder, Several years ago, I cut the bell ends from 3" bronze/brass toilet flange and 90 deg. elbow then silver soldered the two together to allow the lower level toilet to be mounted at floor level rather than on a platform as the previous homeowner/non handyman had tried to install it. I have both torches mounted to adapter hoses so the can be fed from 20 pound BBQ tanks so no problem with the disposables freezing. Gerry :-)} London, Canada ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
#14
Posted to rec.crafts.metalworking
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Propane torches
On 23 Mar 2006 05:31:44 -0800, "
wrote: need to do some brazing, but cant justify expensive kit. Then get yourself to eBay, where such things are cheap and plentiful. It appears that propane torches running at about 4 bar get hot enough without an air supply. Does any one know if this is correct please? Sort of. You don't need 4 bar, but you do need decent flow rates. Most of all though, you need either oxy-propane, blown air or (cheapest) a decent firebrick hearth. Some decent insulation and a few spare bricks to pile above it is like doubling your torch output. http://codesmiths.com/shed/workshop/...ues/hearth.htm If you can get an oxygen cylinder though, I just _love_ my oxy-propane rig. Kit's cheap, it's the bottle rental that costs. As eBay really is cheap and plentiful for new kit, then get yourself a decent propane regulator, not an undersized caravan one. What are the respectable makes? Rothenberger seems to be around a lot. What about Silverline or Bullfinch?? Rothenberger are good. Bullfinch are *%^£ expensive. Silverline are as good as you'd expect. |
#15
Posted to rec.crafts.metalworking
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Propane torches
On Thu, 23 Mar 2006 16:10:12 GMT, wrote:
http://www.abana.org/ronreil/ezburner.shtml build your own burner from the ironmonger's, if they still have such a beast in the UK. IMHO, it's not worth building your own Ron Reil burner in the UK. - They're fussy beasts. There's a lot of fiddling about with precise sizes that Ron has sorted out already. The advantage of his burner design is that he already knows a #23 twiddly works and a #22 doesn't, you don't have to do the experiment with both. - You can't get the bits in the UK. Although we do have bits, we can't just find the exact same part numbers and so it's not possible to get the advantage of a simple ready-adjusted build by using exactly matching sizes. - There's a guy in the USA (linked from or to Ron's site) who makes and sells this design of burner. http://www.hybridburners.com/#Burners They're well made, neatly finished and his prices are reasonable. If you want such a beast, getting one of his is just a lot easier. http://www.jarkman.co.uk/catalog/for...inderforge.htm |
#16
Posted to rec.crafts.metalworking
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Propane torches
On Fri, 24 Mar 2006 03:21:00 -0600, Richard J Kinch
wrote: It's all about BTUs. Not all of it. You need temperature too. "Weed burner" burners are cheap and commonplace and they make _lots_ of BTUs. However the flame is too big and the temperature too low to be a great deal of use for metalworking. |
#17
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Propane torches
Andy Dingley writes:
It's all about BTUs. Not all of it. You need temperature too. Flame temperature is what it is. |
#18
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Propane torches
Martin H. Eastburn writes:
Flame temperature is what it is. Then a match will melt a bridge. But it won't. The match doesn't have enough energy, just temperature. Sigh. Which is why I said, it's all about BTUs, build your own (big) Reil burner, and immerse your parts in flame. Try to follow the context. |
#19
Posted to rec.crafts.metalworking
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Propane torches
Yep - I use one of Ron's designs in a small furnace. Melts metal just nice.
Martin Martin Eastburn @ home at Lions' Lair with our computer lionslair at consolidated dot net NRA LOH & Endowment Member NRA Second Amendment Task Force Charter Founder IHMSA and NRA Metallic Silhouette maker & member Richard J Kinch wrote: Martin H. Eastburn writes: Flame temperature is what it is. Then a match will melt a bridge. But it won't. The match doesn't have enough energy, just temperature. Sigh. Which is why I said, it's all about BTUs, build your own (big) Reil burner, and immerse your parts in flame. Try to follow the context. ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =---- |
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