Working with hydraulic hard lines - brazing

[Mechanos]

What is the filler material that is usually used when brazing various components onto steel hydrualic lines? Is it a bronze filler? Silver-solder? This is for a working pressure of 2500psi.

 

[J_J]

I am not saying that you can not do the job your self, but I think I would take it off and take to a hydraulic shop to someone that does that for a living, or to a qualified welder.

There are kits to repair or splice hard lines.

 

[oldnslo]

What is the filler material that is usually used when brazing various components onto steel hydrualic lines? Is it a bronze filler? Silver-solder? This is for a working pressure of 2500psi.

Silver solder is what is used on ORFS (O-Ring Face Seal) fittings. I have done these on 5/8 tube operating up to 5000 PSI with no problems yet. Connections must be extremely clean and oil free, also need to use a good flux like Harmon & Handy.

These are "socket weld" type connections. I would try any type of "surface weld" at those pressures.

Roy

 

[Mechanos]

I have a couple of hard lines on my tractor that are obviously brazed... and I have others that are obviously welded with what looks like a MIG weld. I could MIG them, TIG them or braze them. Just curious what type of filler was usually used for brazing. Thanks.

 

[crash325]

If you had to ask that question, the simple answer is "Don't Do It."

Follow JJ's advice and take to qualified shop for repair or replacement.

"Brazing" means "Brass" as a filler. Not all brass brazing rod is the same. Many different types for different material. Stainless requires special rod & flux.

The same goes for "Silver Solder". Silver content ranges from .06% to around 92%. Melting temp. starts at about 450 degrees and goes to a little over 1200 degrees. Many, many different alloys and types of flux.

 

[Mechanos]

....The same goes for "Silver Solder". Silver content ranges from .06% to around 92%. Melting temp. starts at about 450 degrees and goes to a little over 1200 degrees. Many, many different alloys and types of flux.

Uhhhhh.... that's why I asked.....

 

[Mechanos]

BTW... brazing does not mean "brass". It's a thermal joining process where a molten filler material is used to join metal parts through capilary action.

Soldering and Brazing
Thermal joining processes in which the molten filler metal is drawn into a capillary gap between two closely fitting surfaces. By definition:- Soldering takes place at temperatures below 450˚C and brazing above 450˚C. Both processes occur below the melting point of the metals being joined.

Silver Brazing
Is a type of brazing using filler metals containing silver that melt between 600˚C and 900˚C. Silver soldering/Hard soldering are terms synonymous with Silver Brazing (not soldering).

Fusion Welding
A thermal joining process in which the mating faces are softened or made liquid by the application of heat or pressure or by both. Filler metal with a similar composition to the parent metal may or may not be added.

Braze or Bronze Welding
A thermal joining process using a hand torch and filler metal with a lower melting point than the parent metals. The process uses copper based filler metals melting above 850˚C and does not rely on capillary attraction.

 

[cowski]

i would tig them

 

[AKwelder]

i have mended a few over the years.

If they are used and dirty, Tig is a pain. You just keep boiling more oil and impurities up through the puddle. if you can get some type of overlapping joint i would use sil-floss. A brand of silver solder. with a good flux

I have had to arc weld some and even splice a couple with butt joints. i can be done, it just is a pain.

 

[hizoot]

i have mended a few over the years.

If they are used and dirty, Tig is a pain. You just keep boiling more oil and impurities up through the puddle. if you can get some type of overlapping joint i would use sil-floss. A brand of silver solder. with a good flux

I have had to arc weld some and even splice a couple with butt joints. i can be done, it just is a pain.

actually....its sil-fos . I buy 15%silver content to use brazing copper.....and I buy alot of it as I do refrigeration/ac work. Last week, it was up to 115.00 a lb.

 

[crash325]

BTW... brazing does not mean "brass". It's a thermal joining process where a molten filler material is used to join metal parts through capilary action.

Soldering and Brazing
Thermal joining processes in which the molten filler metal is drawn into a capillary gap between two closely fitting surfaces. By definition:- Soldering takes place at temperatures below 450˚C and brazing above 450˚C. Both processes occur below the melting point of the metals being joined.

Silver Brazing
Is a type of brazing using filler metals containing silver that melt between 600˚C and 900˚C. Silver soldering/Hard soldering are terms synonymous with Silver Brazing (not soldering).

Fusion Welding
A thermal joining process in which the mating faces are softened or made liquid by the application of heat or pressure or by both. Filler metal with a similar composition to the parent metal may or may not be added.

Braze or Bronze Welding
A thermal joining process using a hand torch and filler metal with a lower melting point than the parent metals. The process uses copper based filler metals melting above 850˚C and does not rely on capillary attraction.

Sure nice to learn all of this. After spending a little over 30 years, Silver Soldering (up to 1250 degrees.) Gold soldering or welding up to around 1350 degrees, Platinum at a little over 3,000 degrees.

Strange that silver is named solder, brass is named brazing rod. Gold named gold solder, & platinum named solder.

Click on the links below, first is silver, then gold, next platinum

Silver Solder Sheets | Jewelry Making Supplies - Soldering / Solders - Beading Supplies
Plumb Gold Solder Sheets | Jewelry Making Supplies - Soldering / Solders - Beading
Platinum Solders | Jewelry Making Supplies - Soldering / Solders - Beading Supplies, Tools

 

[AKwelder]

the small packet left in my tool box just earned it's own spot in my garage!! WOW

We also use it for MED gas work.