Home |
Search |
Today's Posts |
|
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. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
How do you braze steel...?
It's been many a year since I brazed something, but I had the occasion
to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. I kept the secondary material nice and red as well, and began adding the brass by laying the unmelted tip of the rod into the inferno and applying heat to the rod so it would melt and flow out across the hot material. Did it work...hell no! As the torch melted the rod, it "spattered" and popped, kinda blowing itself out onto the parent and secondary metal; looked like a smoked up, ****ty stick weld that didn't penetrate. My torch was going pretty good, with a brazing tip and the small, blue/white cone inside the flame. I know brazing looks better than this, and the brass flows out nice and smooth with no fuss, no muss. HELP !!!! Ronnie |
#2
|
|||
|
|||
"Ronnie" wrote in message
oups.com... It's been many a year since I brazed something, but I had the occasion to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. I kept the secondary material nice and red as well, and began adding the brass by laying the unmelted tip of the rod into the inferno and applying heat to the rod so it would melt and flow out across the hot material. Did it work...hell no! As the torch melted the rod, it "spattered" and popped, kinda blowing itself out onto the parent and secondary metal; looked like a smoked up, ****ty stick weld that didn't penetrate. My torch was going pretty good, with a brazing tip and the small, blue/white cone inside the flame. I know brazing looks better than this, and the brass flows out nice and smooth with no fuss, no muss. HELP !!!! Ronnie You probably got the steel too hot, from your description. When brazing, don't heat the rod. And be sure to keep that inner cone off the steel. Any oxidizing at all will make your brazing a mess. You'll get more detailed tips from others, I'm sure. Having made all those mistakes myself, but still being an amateur, I give out only amateur advice on brazing and welding. g -- Ed Huntress (remove "3" from email address for email reply) |
#3
|
|||
|
|||
"Ronnie" wrote in message
oups.com... It's been many a year since I brazed something, but I had the occasion to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. I kept the secondary material nice and red as well, and began adding the brass by laying the unmelted tip of the rod into the inferno and applying heat to the rod so it would melt and flow out across the hot material. Did it work...hell no! As the torch melted the rod, it "spattered" and popped, kinda blowing itself out onto the parent and secondary metal; looked like a smoked up, ****ty stick weld that didn't penetrate. My torch was going pretty good, with a brazing tip and the small, blue/white cone inside the flame. I know brazing looks better than this, and the brass flows out nice and smooth with no fuss, no muss. HELP !!!! Too hot. Use just enough heat on base material to allow melting rod to flow into the heat. Just like soldering, except hotter. |
#5
|
|||
|
|||
Find someone to teach you how to braze. It is dirt simple but I
don't think you'll learn nearly as well from reading as you would from 10 minutes of hands-on instruction and demo. I'm in Minneapolis. If you are nearby, drop me an email, I think we'd have you making good brazed joints right quick with a visit. On 21 Dec 2004 21:28:36 -0800, "Ronnie" wrote: It's been many a year since I brazed something, but I had the occasion to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. I kept the secondary material nice and red as well, and began adding the brass by laying the unmelted tip of the rod into the inferno and applying heat to the rod so it would melt and flow out across the hot material. Did it work...hell no! As the torch melted the rod, it "spattered" and popped, kinda blowing itself out onto the parent and secondary metal; looked like a smoked up, ****ty stick weld that didn't penetrate. My torch was going pretty good, with a brazing tip and the small, blue/white cone inside the flame. I know brazing looks better than this, and the brass flows out nice and smooth with no fuss, no muss. HELP !!!! Ronnie |
#6
|
|||
|
|||
On Wed, 22 Dec 2004 06:18:09 -0000, "Leon Heller"
wrote: When I made a screwdriver on a metalworking course 40 years ago, I used brass shavings mixed with flux (a blue paste). The molten brass flowed into the joint between the blade and the handle very nicely. Leon Leon I've heard of silver solder in a paste but not brass. Was this a *home made* concoction, if so do you recall what was used for the paste flux (all I know of is the powdered stuff) ? Forger |
#7
|
|||
|
|||
In article .com,
"Ronnie" wrote: It's been many a year since I brazed something, but I had the occasion to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. Too hot, by far. You also don't mention applying any flux to the joint (prefluxed rod alone does not do it). -- Cats, Coffee, Chocolate...vices to live by |
#8
|
|||
|
|||
Too hot! Read the rest of the posts. I would add that you need to tune
your flame by adding oxygen slowly untill the "feather just dissapears...thus a "Neutral" flame. If you add too mush oxygen to a pointy flame it is a "Reducing" flame and will break-down metals and cause brass separation and steel out-gassing and poping. If the flame is too rich with Acet., ( big feather) it will contaminate the piece with carbon. ...or something like that. "Ronnie" wrote in message oups.com... It's been many a year since I brazed something, but I had the occasion to try the other day...it sucked. Using an ox/acet brazing tip and new, prefluxed rod, clean material, I heated the parent material red hot, almost to the point of puddling. I kept the secondary material nice and red as well, and began adding the brass by laying the unmelted tip of the rod into the inferno and applying heat to the rod so it would melt and flow out across the hot material. Did it work...hell no! As the torch melted the rod, it "spattered" and popped, kinda blowing itself out onto the parent and secondary metal; looked like a smoked up, ****ty stick weld that didn't penetrate. My torch was going pretty good, with a brazing tip and the small, blue/white cone inside the flame. I know brazing looks better than this, and the brass flows out nice and smooth with no fuss, no muss. HELP !!!! Ronnie |
#9
|
|||
|
|||
"Forger" wrote in message
... On Wed, 22 Dec 2004 06:18:09 -0000, "Leon Heller" wrote: When I made a screwdriver on a metalworking course 40 years ago, I used brass shavings mixed with flux (a blue paste). The molten brass flowed into the joint between the blade and the handle very nicely. Leon Leon I've heard of silver solder in a paste but not brass. Was this a *home made* concoction, if so do you recall what was used for the paste flux (all I know of is the powdered stuff) ? The flux was the blue paste, I mixed it with the brass shavings. Leon |
#10
|
|||
|
|||
In article ,
says... I've heard of silver solder in a paste but not brass. Was this a *home made* concoction, if so do you recall what was used for the paste flux (all I know of is the powdered stuff) ? I use a blue paste flux with brass, made by GasFlux. It's around $10 for a 1-lb tub, I get mine from www.henryjames.com. -- is Joshua Putnam http://www.phred.org/~josh/ Braze your own bicycle frames. See http://www.phred.org/~josh/build/build.html |
#11
|
|||
|
|||
"Tom Gardner" wrote in message m... Too hot! Read the rest of the posts. I would add that you need to tune your flame by adding oxygen slowly untill the "feather just dissapears...thus a "Neutral" flame. If you add too mush oxygen to a pointy flame it is a "Reducing" flame and will break-down metals and cause brass separation and steel out-gassing and poping. If the flame is too rich with Acet., ( big feather) it will contaminate the piece with carbon. ...or something like that. Reducing flame is carbon rich. Oxygen rich flame (hot blue/white cone) is an oxidizing flame. A neutral flame is desirable for brazing. Harold |
#12
|
|||
|
|||
That is true on Earth...but, on MY home planet....
"Harold & Susan Vordos" wrote in message ... "Tom Gardner" wrote in message m... Too hot! Read the rest of the posts. I would add that you need to tune your flame by adding oxygen slowly untill the "feather just dissapears...thus a "Neutral" flame. If you add too mush oxygen to a pointy flame it is a "Reducing" flame and will break-down metals and cause brass separation and steel out-gassing and poping. If the flame is too rich with Acet., ( big feather) it will contaminate the piece with carbon. ...or something like that. Reducing flame is carbon rich. Oxygen rich flame (hot blue/white cone) is an oxidizing flame. A neutral flame is desirable for brazing. Harold |
#13
|
|||
|
|||
"Tom Gardner" wrote in message ... That is true on Earth...but, on MY home planet.... G Harold |
#14
|
|||
|
|||
On Wed, 22 Dec 2004 21:44:05 -0800, Joshua Putnam
wrote: In article , says... I've heard of silver solder in a paste but not brass. Was this a *home made* concoction, if so do you recall what was used for the paste flux (all I know of is the powdered stuff) ? I use a blue paste flux with brass, made by GasFlux. It's around $10 for a 1-lb tub, I get mine from www.henryjames.com. Furnace brazing is generally done with a paste of bronze (spelter) and flux. It is "buttered" on the joint, the joint is assembled, and the part is "baked". |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
d-i-y sliding steel double gate | UK diy | |||
Steel Choice? | Metalworking | |||
Drilling through a steel pipe. | Metalworking | |||
Plastering onto steel | UK diy | |||
blue steel for carving tools? | Metalworking |