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3/4 Valve Won’t Solder

 
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Old 05-14-2019, 09:17 AM   #21
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Re: 3/4 Valve Won’t Solder


I always use a slightly damp rag. Never got burned.
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Old 05-14-2019, 04:31 PM   #22
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Re: 3/4 Valve Won’t Solder


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I've had many situations where old pipe just would not solder. I've had to do what you did, and just cut it out, or use a sharkbite.

I soldered successfully with propane for a short time, until I switched to MAPP gas 20 years ago. Soldering something with a lot of mass, like a ball valve, is going to be difficult with propane.

And please don't use a wet rag to wipe a joint after soldering. You'll get a nasty burn. Use a dry one.

And yes, excess flux should be wiped up. It's actually a corrosive product, and should not be left on the pipe.
RE Flux, my dad worked on the first communication satellite @Hughes Aircraft in the late 60's (CommSat) After a few launches, they were having some failures and could not figure out why. Come to find out, when the techs were soldering all the PC boards, they were failing to clean the tell tale flux left on the connections. After cleaning, no more failures.
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Old 05-14-2019, 06:36 PM   #23
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Re: 3/4 Valve Won’t Solder


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I always use a slightly damp rag. Never got burned.
Ditto. Never got burned by a wet rag either.

A dry rag won't clean the flux off nearly as well.
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Old 05-14-2019, 06:39 PM   #24
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Re: 3/4 Valve Won’t Solder


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RE Flux, my dad worked on the first communication satellite @Hughes Aircraft in the late 60's (CommSat) After a few launches, they were having some failures and could not figure out why. Come to find out, when the techs were soldering all the PC boards, they were failing to clean the tell tale flux left on the connections. After cleaning, no more failures.
Totally worthless, but there ya go info: First IDE drive I ever owned came from a reject pile from Hughes Sats. Cost me a pretty penny, even so.
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Old 05-14-2019, 06:53 PM   #25
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Re: 3/4 Valve Won’t Solder


My first hard drive cost me $400.00. It was 40MB.

Might hold one or two pictures.
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Old 05-14-2019, 07:23 PM   #26
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Re: 3/4 Valve Won’t Solder


There are possibly 2 wipes. One to get rid of excess solder while it is still liquid. This us usually a dry wipe. A wet wipe at this stage risks cooling the joint unevenly, degrading the joint. The second one is to get the flux off the pipe. This would usually be wet with the pipe still warm.
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Old 05-14-2019, 09:24 PM   #27
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Re: 3/4 Valve Won’t Solder


Use mapp or acetylene, plenty of flux, too little is worse than too much. Make certain everything is freshly cleaned .

Yes if you stay too long with a low temp torch you will overheat everything damaging the valve and all.

It's hard to reflow a joint if it leaks. The best thing to do is take it all apart and start from square one.

If you are repositioning a good joint. Make sure everything is clean and dry. Flux everything. Even adjacent joints that will keep the solder from receding.

If you find you're spending too much time with the heat, due to water, old joint, you can try to introduce more flux then try it again as a last ditch effort. The flux is a cleaning agent. You will know if solder starts to flow then your good. Otherwise you need to pull it apart.

Solder always travels towards the heat.

Sometimes wet the joint on the front side with solder in one spot. This can help a lot with heat transfer between your two pieces.

On some really old junk I've hit the area (before making the joint t but in prepping) with flux and then heat afew times in an effort to clean the surfaces ( very extreme cases)

I wait for the joint to cool Abit and wipe with a wet rag to clean off the flux.

Experience through trial and error.

All different things to consider....

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