Brazing with OXY/Propane

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Hi Everyone.I havnt brazed anything is 20 plus years.  I dont remember anything about it since they taught it in trade school.  I am  however experienced in the shop.  Have my 4 stick tickets and pretty handy with a mig and a hot wrench too.My son has a mini dirt bike gas tank I would like to braze.  Its paper thin and I cant find another.I picked up some brazing rods today.  Flux coated type.Can someone help me with the basics.....  First can I use my Victor brazing tip ( that came with my set)  for oxy /propane?  If I can what should the pressures be?I apoligize in advance for my ignorance....lol.
Reply:I’ve never had any luck brazing “paper thin” material.A hole has always blown through about a millisecond after steelreaches brazing temperature. I’ve only tried it with small welding tips, always keeping the torch moving, to try to avoid burning through.Last edited by jpump5; 9 Hours Ago at 07:07 PM.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:Uh oh.  I dont have a back up plan......
Reply:What does "paper thin" mean? Is it very thin near a rust hole, or is the whole tank thin? Brazing wouldn't be my first choice to patch. You'll have to be absolutely clean inside & out. I'd favor solder, or cut in a patch & TIG it.An optimist is usually wrong, and when the unexpected happens is unprepared. A pessimist is usually right, when wrong, is delighted, and well prepared.
Reply:I have buddy said as a young welder they had to fill a 1 inch hole with braze alloy without drip for brazing cert.Assuming you are repairing it?  Cleanliness on the brazing side.  Use use the side of the flame for heating, that way you can flip the torch away to control heat. Propane will heat a large area, itza bit more difficult than with acetylene.  Your torch tip may be quite a ways away from the metal. Apply flux to the surface to use as a indicator. When it goes watery clear bronze should flow. After reading WillieB's suggestion.... Plug and braze. If small enough put a screw in it.Tank purged and clean for welding is a must. Be careful.Tip size will determine pressures.
Reply:Victoria has charts for there tips on gas pressure Dave

Originally Posted by bigbuilder

Hi Everyone.I havnt brazed anything is 20 plus years.  I dont remember anything about it since they taught it in trade school.  I am  however experienced in the shop.  Have my 4 stick tickets and pretty handy with a mig and a hot wrench too.My son has a mini dirt bike gas tank I would like to braze.  Its paper thin and I cant find another.I picked up some brazing rods today.  Flux coated type.Can someone help me with the basics.....  First can I use my Victor brazing tip ( that came with my set)  for oxy /propane?  If I can what should the pressures be?I apoligize in advance for my ignorance....lol.
Reply:

Originally Posted by bigbuilder

Hi Everyone.I havnt brazed anything is 20 plus years.  I dont remember anything about it since they taught it in trade school.  I am  however experienced in the shop.  Have my 4 stick tickets and pretty handy with a mig and a hot wrench too.My son has a mini dirt bike gas tank I would like to braze.  Its paper thin and I cant find another.I picked up some brazing rods today.  Flux coated type.Can someone help me with the basics.....  First can I use my Victor brazing tip ( that came with my set)  for oxy /propane?  If I can what should the pressures be?I apoligize in advance for my ignorance....lol.