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-   -   This brazing rod good? (http://www.diychatroom.com/f17/brazing-rod-good-34471/)

integlikewhoa 12-27-2008 02:53 AM

This brazing rod good?
 
I have 3 sticks of this brazing rod Im wondering if its ok to use on a Trane 3 ton 2 stage 410-A unit.

Its made by Bernzomatic part# PC-3
Its a copper phosphorus brazing and welding rod.

Says: tensile strenght 40,000 psi
working temp 1310 to 1475 degress
joins copper to copper without flux or copper to copper alloys(brass and bronze). This alloy is widely used in refrigeration, electrical and plumbing to join copper tubing and pipe, electrical wires and flexible tubeing. Excellent for soldering copper tubing connections even with water in the line.

The thing that gets me is it doesnt say anything about the the silver content. I have heard some people say that you have to use 5% or higher. My instruction manual doesnt say what % to use.
It only says " use a dry nitrogen purge and braxing alloy without flux when brazing the field line to the copper factory connection." Also says to "flow dry notrogen threw one port out the other and only to use accepted good brazing techniques"

What do you think?

beenthere 12-27-2008 07:42 AM

Doesn't have to have Silver in it.

Ok to use, won't flow as easy as a Silver content brazing rod.

Nitrogen prevents internal oxidation while brazing.

hvaclover 12-27-2008 10:32 AM

Not ok to use from what I have seen. Does not hold up over time and they are prone to vibration cracks more so than a silver baring braze. Been back on enough of them to form an informed opinion.

I use nothing less than 15% silver rods

integlikewhoa 12-27-2008 11:29 AM

Hmmm so tis is the question....... To silver or not silver.

beenthere 12-27-2008 11:40 AM

I use mainly 15%.
I've used 5%, it doesn't flow as good as 15.

And 45% is too expensive for copper to copper brazing.

hvaclover 12-27-2008 11:57 AM

Quote:

Originally Posted by beenthere (Post 203031)
I use mainly 15%.
I've used 5%, it doesn't flow as good as 15.

And 45% is too expensive for copper to copper brazing.

45% has it's place in steel to copper application.

The place it's used most in hvac is domestic refrigerators for sealed system, work-comppressor replacement ect.-

micromind 12-27-2008 01:12 PM

I wouldn't put a huge amount of faith in the instructions.

It says "Excellent for soldering copper tubing connections even with water in the line."

With a working temperature of over 1000 degrees, I'd like to know just exactly how you're going to get a copper tube full of water hot enough to melt the solder!

Just a thought.

Rob

integlikewhoa 12-27-2008 02:05 PM

So with more silver in it, its going to easier to use? Because it will flow into the joints eaiser? How much should I be paying for a stick of this. I think the stuff I had I only paid 3.00 for like 3 sticks. Probley goes to show it dont have silver in it.

beenthere 12-27-2008 05:21 PM

I don't know what it will cost you for just 2 or 3 sticks, I buy it by the tube, at 28 sticks to the tube.

But, it cost a lot more then a buck per stick.

integlikewhoa 12-27-2008 07:15 PM

I figured I have the cheap sticks.

Ill have to barrow some from somewhere if I cant find just a stick somewhere. I'm only doing my own house and like 4 connections at that, so I dont need a whole bunch fo them. Thanks

hvaclover 12-27-2008 08:00 PM

Quote:

Originally Posted by integlikewhoa (Post 203206)
I figured I have the cheap sticks.

Ill have to barrow some from somewhere if I cant find just a stick somewhere. I'm only doing my own house and like 4 connections at that, so I dont need a whole bunch fo them. Thanks



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