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Old 08-29-2016, 05:14 PM   #16
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Re: Soldering Question


Check out post #13.Lead free solder is a real pain for someone that has not used it before and the flux at the big box stores sucks.
Try what I suggested.Clean it good flux it,heat it and when the solder begins to melt run a flux brush around the joint with some flux on it.If you have a wet joint nothing will do you any good until it's dried out.
That clean joint looks like copper to copper and should be no problem.
Use the tip of the flame or close to it.If you start getting black on the joint reclean it.You have the torch to close.
Heat the fitting .Not the pipe
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Old 08-29-2016, 05:22 PM   #17
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Re: Soldering Question


The original joint may not be soldered with tin solder. It may be silver solder and the new tin solder will not stick to it.

You also may be overheating it.
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Old 08-29-2016, 05:34 PM   #18
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Re: Soldering Question


I doubt it.He's cleaned it off .I don't know of any plumber or manufacturer that uses silver solder for plumbing.
The man does not know how to solder and trying to use lead free solder and flux which only makes it more difficult.

Last edited by mako1; 08-29-2016 at 05:40 PM.
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Old 08-29-2016, 10:40 PM   #19
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Re: Soldering Question


My suggestions here would be.

First turn off water, then open some valve lower this valve and drain the water form the pipe connecting to this valve. Any water close to this valve will take the heat away.
Quote:
To clarify: the solder would melt but it wouldn't "run", or wick, into the joint. It just balled up into small blobs and then would not adhere to the joint.
That is because the metal is not hot enough. Or you did not flux. You heat the metal and let the metal melt the solder. You do not melt the solder with the flame

Quote:
Question: Other than keeping the idiots at the EPA happy, what's the advantage of using solder that contains lead? Does it flow better?
Solder used for plumbing is 95/5. That is it is 95% tin and 5% lead. In the past it was 60/40 or 55/45. Lead melts at a lower temperature than tin. Meaning it was easier to use because of the lower temperature required.

This is going to be very difficult because of the different metals and because differences in bulk of the metals. Probably impossible for the novice.

Apply the heat to the valve at 7 or 8 o'clock as shown. You don't want to create leaks in other joints.

The tip of the blue flame (in side the yellow flame) is the hottest part of the flame. Engulfing the pipe in the flame is not the way to do it.

Apply a small mount of flux to the joint.
My opinion LA-CO is best flux.

Heat joint until flux liquefies. Continue heating and begin touching solder to top of joint. When solder begins melting, let it run down both sides of pipe. It won't take much. Solder will run down and form bead at bottom of pipe. Stop and wipe joint with a wet cloth.
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Last edited by hkstroud; 08-29-2016 at 10:44 PM.
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Old 08-30-2016, 06:35 AM   #20
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Re: Soldering Question


Not a plumber but if that was my house i would buy a new moen rough in shower valve setup for pex, cut the existing copper lines, remove the old valve and either sharkbites to connevt the copper to the pex, or solder on adapters to the copper and use pex crimp rings. Total cost about $200 and faw fewer headaches now and in the future. Just my $.02

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Old 08-30-2016, 05:10 PM   #21
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Re: Soldering Question


Lead free doesn't apply to bathing fixtures. Only fixtures you drink or cook with.
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Old 08-30-2016, 09:21 PM   #22
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Re: Soldering Question


Have you ever gotten water in your "pie hole" while showering?

I know that I have.


ED
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Old 08-31-2016, 04:47 AM   #23
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Re: Soldering Question


You need to replace the entire valve with a new pressure balanced valve. The existing valve is not repairable, no matter what anyone says. I have serviced hundreds of these Delta-brand valves. They were a good valve in their time, but your valve is worn-out, shot, kaput...replace it or have a plumber do it for you.
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Old 08-31-2016, 05:38 PM   #24
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Re: Soldering Question


Quote:
Originally Posted by de-nagorg View Post
Have you ever gotten water in your "pie hole" while showering?

I know that I have.


ED
Doesn't matter the lead free standards do not apply to shower or tub valves. You normally do not drink a lot of your bathing water do you?
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