Brazing hydraulic fitting

[johnyev]

I've had a lot of success silver soldering hydraulic fittings. Even had to repair a steel hydraulic pipe off the front end of a New Holland 180 digger. It had been loose in the clamp and had been moving and wore a hole. Took it off, cleaned through with paraffin and then silver soldered over the worn area. Silver solder ran beautifully and held the full hydraulic pressure to the 4 in 1 bucket. Was only meant as a stop gap as no replacement pipe in the country at the time. Pipe was still on there when digger was sold a few years later. Cleanliness is the key (the metal part - not the operative). I just used a small nozzle on the oxy acetylene torch (probably a 2a) Have also silver soldered the two parts of a fuel banjo together when they had been snapped apart but obviously very low pressure involved on that.

 

[johnyev]

I was taught 34 years ago that silver solder would easily hold 3000 psi.
As others have said a new fitting is safest but sometimes you just need to fix something.

 

[matt_1234]

if u sweat braze say one pipe inside another (close fitting) for about an inch in length the braze wont let go......
it's when u BUTT braze the problems start.....
as said before cheap enough, buy new....

I was told this is the best way to do it, putting a pipe over the bad pipe and brazing them together. When you say sweat braze about an inch, what exactly do you mean? Does the braze need to flow down in between the pipes or braze over the top of the two?

 

[chrismac]

I was told this is the best way to do it, putting a pipe over the bad pipe and brazing them together. When you say sweat braze about an inch, what exactly do you mean? Does the braze need to flow down in between the pipes or braze over the top of the two?

The braze does need to flow between the pipes being joined, capillary action will draw the braze between the pipes.

 

[Cobbler]

I was told this is the best way to do it, putting a pipe over the bad pipe and brazing them together. When you say sweat braze about an inch, what exactly do you mean? Does the braze need to flow down in between the pipes or braze over the top of the two?

The post that you’ve replied to was from 2020, my guess is the job is finished by now. Welcome to the forum.