How to Solder Copper Pipe Joints - Buy a self-lighting torch. Good torches work faster.
- Use a good-quality tubing cutter. Make clean, burr-free cuts.
- Use a steel brush for complete cleaning of pipes and fittings.
- Apply tinning flux rather than regular flux.
- Assemble the pipes, then solder the joints all at once.
- Heat the joint just enough to melt the solder.
Also asked, what is the best solder to use on copper pipes?
The Best Solder Is Safe Solder The new lead-free 95/5 solder, 95% tin 5% antimony, has a lower viscosity than 50/50. That means it flows more quickly when molten. It flows so quickly that it can flow right through the joint while it is being applied leaving a gap at the top of the joint.
Also Know, do you need flux to solder copper pipe? Flux is a chemical which helps you solder. Flux prevents the copper from oxidizing as you heat the copper with the torch. In addition, it prevents the pipe from oxidizing as you heat it. You can solder without flux, but it is really difficult!
Keeping this in consideration, how do you're solder a copper pipe without removing it?
I use a MAPP torch and my process is something like this.
- Clean the pipe and fitting.
- Go crazy with the flux, flux is your friend that "sucks" the solder into the joint. Do not skimp on the flux.
- Heat up the fitting, when the flame turns green it is hot enough.
- Quickly add the solder all the way around the fitting.
Can you solder without flux?
Bear in mind though, most common solder wire is rosin-core, it has one or more cores of flux inside of it. The kind of solder plumbers use has no flux because they apply the flux externally. So you could solder with that solder. At low heat the solder might not melt fast enough, and a cold solder joint may result.
What kind of torch do you use to solder copper pipe?
Torch. The torch needed for soldering copper can be propane or MAPP gas (methylacetylene-propadiene propane). MAPP gas comes in a yellow tank and propane comes in a blue tank. MAPP gas, usually a bit more expensive, gets much hotter than propane, so heats the pipe faster.How do you sweat copper fittings?
Steps - Cut the pipes to the right length using a hacksaw or a copper tube cutter.
- Remove the burs with a wire brush or file.
- Clean the end of the copper pipe with a special cleaning brush.
- Clean the inside of all fittings.
- Apply soldering paste to the cleaned ends of the pipe and the insides of the cleaned fittings.
Can you use too much flux when soldering?
If you are using Rosen Activated or RMA flux, then you definitely need to clean it off and then the notion of “too much” can come into play as it tends to crystallize more, can be difficult to remove and is corrosive. However it does a grea That depends on what kind of soldering you do and what kind of flux you use.What is the difference between Type L and Type M copper pipe?
The key difference between types L and M is their pressure rating and wall thickness. The most common copper pipe sizes are ½ and ¾ inches. Type M ½ inch measures 0.028” in wall thickness whereas type L ½ inch measures 0.04” in wall thickness.Can you Resolder a copper pipe?
As long as the pieces are cleaned of gunk, you add flux, and you can get the fitting over the pipe, it's no big deal to solder it back together. Sandpaper or a bastard file will get the excess solder off, but heating it until molten then wiping with a clean lint-free rag will be faster and easier.Can you solder copper pipes upside down?
sweating copper pipe - upside-down?? Yes. If you have properly prepared the surfaces and heat it correctly, the solder should be drawn into the joint. Just make sure you aren't using too much heat. It will cause the flux to lose its capillary ability to draw up the solder.Why is it called sweating pipes?
The most common way of joining copper pipe is by soldering (it's called 'sweating' mostly in the U.S., probably because the pipe 'sweats' as it heats up). Flux is used to prevent oxidation in the copper when the heat is applied, and to 'wet' the metal, allowing the liquid solder to flow more easily into the joint.Why does my solder not stick to copper pipe?
Keep pipes dry when soldering Don't try to solder pipes with water in them. Most of the heat from the torch goes into turning the water to steam, so the copper won't get hot enough to melt the solder. Stop the trickle of water with a pipe plug. Push the plug into the pipe with the applicator tube provided.Why does my solder not stick?
A classic reason solder won't stick to something is because you're not getting it hot enough. Touch some solder on it, and it should melt almost instantly. Put a nice little blob of solder on the tip of the iron. Press the blob of solder into the metal to be soldered.Can I use plumbing flux for electrical?
The acid flux in plumbing solder differs from electrical solder, which contains rosin flux. However, that corrosive acid flux will rapidly degrade wiring if plumbing solder is mistakenly used for electronics. Deteriorated wiring may cause the connection to fail. Electrical shorts or even fire may result.What causes pinhole leaks in copper pipe?
A. As copper plumbing becomes old, pinhole leaks become increasingly common. Pinhole leaks can also be caused by particles of corrosion from old water heaters. When the interior of a hot water tank begins to corrode, steel particles can accumulate inside the copper hot-water pipes.What is tinning flux used for?
What is Tinning Flux, and what are its recommended uses? Tinning Flux has a small amount of powdered solder in the paste that makes soldering easier. You can use Tinning Flux on Low-Lead Brass if you are a novice user of solder products, or for large diameter piping systems to help make the process easier.What does flux do when soldering copper?
Flux is an acidic paste that is water-soluble, which makes cleaning up simple by using water and a cotton rag. Flux is applied to all of the pieces of copper that you want to connect together. The flux paste will draw in the solder after the pipe is heated using a blow torch.How much solder do you need for a joint?
The flux requirement is usually 2 ounces per pound of solder. 
