Brazing Copper to Copper with Oxy Acetylene

[GasTech87]

Hello everyone, i have tssa coming to test me on my brazing on friday for my certification, usually i would do most of my brazing with turbo torch hooked up to acetylene but they want oxy acetlyene, basically they are gonna have me braze a few different pipe sizes and they are going to cut the pipe in half to inspect for penetration, ive been practising and im confident with my braze, does anyone have any tips to getting maximum penetration? or maybe some direction on where i can get some diagrams of proper penetration.

Thanks, Don.

[Admin]

Checkout the Soldering, Brazing & Welding Manual of Techniques - Page 41  - Here

I adjust my acetylene pressure to 2.5 psi and my oxygen pressure to 10 psi.  A 4:1 ratio.

I would just make sure you clean the copper and use that white flux, to help you know when to apply your silfos.  I just use a sweeping motion below my joint, on the fitting.  When the flux starts to bubble apply the silfos.



I usually use a neutral flame to prevent oxidation.  I also run nitrogen through my copper lines while I'm welding to prevent this as well.
I'm no welding pro, but I hope this helps.

BTW are you in HVAC, why is TSSA making you get certification to weld?  I've been expecting them to make me get an electrical and welding license to do residential A/C work.  They're always looking for ways to suck more money out of us tradesmen.

Download the Boilers and Pressure Vessels Director's Order BPV-07-01 - Here

Notwithstanding subsection 2.(2)(i) of Ontario Regulation 220/01 (Boilers and Pressure Vessels), the regulation does not apply to refrigeration piping that has a capacity of three tons (11 kW) or less of refrigeration or a capacity of five tons (18 kW) or less of refrigeration in an air conditioning system.

[GasTech87]

Thats my usual procedure , i should be fine thanks though.... and yea im in HVAC we do quite a bit of work running oxygen lines for big lasers n such and tssa wants you to have a brazing license, so far in total for this brazing certificate is gonna run me around 5000 between paying for them to come out and test you and all the certificates