Can You Solder To Copper?

What is the difference between plumbing solder and electrical solder?

Perhaps the key difference between electrical and plumbing solder is the type of flux used in each application.

The flux also aids wetting, helping the solder to flow and bond with the metals more readily.

Typically, electrical solder contains rosin core flux; plumbing solder uses an acid-based flux..

What causes solder not to stick?

A classic reason solder won’t stick to something is because you’re not getting it hot enough. My interns come to me with this problem all the time. Make sure the tip of the iron is nice and shiny. Touch some solder on it, and it should melt almost instantly.

Do you need flux to solder copper wire?

Inorganic flux is used on stronger metals such as copper and stainless steel. … Flux core solder has flux in the center of the solder wire. Additional flux is unnecessary for most applications, but using additional flux still may make the solder easier to work with for some tasks.

What kind of solder do you use on copper?

Buy lead-free solder that’s designed for copper water pipes; you’ll find it in the plumbing section of the store. Solder with lead is still available, but the lead can leach into your water supply, so don’t use it.

Can silver solder be used on copper?

A simple way of soldering together a piece of copper and a piece of silver is to use a technique called sweat soldering. … Now, with a small amount of easy silver solder coated in flux and placed at the very end of some fine tweezers, you can begin to heat it with your hand torch.

Can you solder copper with a soldering iron?

Because the soldering iron is extremely hot, don’t lay it down while you are looking for the next part to solder. You can buy a soldering kit, which includes a soldering gun and base, sponge and solder, which will generally be tin or silver and work fine with copper.

Can you solder copper without flux?

Flux is a chemical which helps you solder. Flux prevents the copper from oxidizing as you heat the copper with the torch. … You can solder without flux, but it is really difficult! Flux is applied to both the pipe and the fitting with a handy miniature paint brush.

Can you overheat copper pipe when soldering?

Overheating is a major problem when brazing or soldering copper pipe because the flux will burn (become oxidized), stop working, and become a barrier to tinning. In addition, a heavy oxide can be formed on the pipe itself, preventing a bond from forming between the filler metal and the pipe surface.

What solder do plumbers use?

Acid core solders are most often used in plumbing applications to join metal pipes or sheet metal. Rosin core solder is also fabricated with a hollow core inside the solder wire, but the flux used is a milder variety made of rosin, which is a solid form of resin derived from conifers such as pine.

Can I use electrical solder for copper pipe?

Electrical solder is generally hollow, with a core made of a flux intended to solder copper wires. This flux is not made for copper water pipes. You will want to use a separate paste flux especially made for sweating copper water pipe (and a small brush to apply it). Some electrical solders contain an amount of lead.

Can solder joints go bad?

Yes, solder joints can break if the board that they are soldered to is bent. They can go bad if they are exposed to large and quick temperature cycles, or if they are exposed to corrosive chemicals.

How do you fix a bad solder joint on copper?

Apply soldering flux around the whole joint and apply heat with a torch until the old solder melts. Add new solder until a shiny ring of solder shows all around the joint. Let the pipe cool for five minutes, then turn the water back on and cross your fingers that you stopped the leak.

Can steel be soldered to copper?

Technically, you can either braze or solder, though you cannot braze with solder or solder with brazing rods. But you can attach copper to steel with silver solder using a propane torch, and call it whatever you like. … Apply a coating of flux to the steel where you are going to solder on the copper.

Does solder stick to copper?

The surface of the copper is very smooth so thag when you apply the solder to it , it will not stick to it. To apply solder, the surface need to be rough or it should be tinned so when you apply solder it will melt and stick.

Why does my solder not stick to copper pipe?

The solder will “stick” to (wet) the pipe when the pipe is clean and hot enough to melt the solder. The copper joint areas must be bright clean on both inside and outside mating surfaces. … Use a propane torch to heat ONLY the outside PIPE fitting evenly.

What is the best solder for copper pipe?

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.

How do you solder copper together?

solderStep 1: Prepare Inside of Fitting.Step 2: Clean Outside Of Pipe.Step 3: Apply Flux to Pipe.Step 4: Unwind Solder Wire.Step 5: Heat the Fitting to Sweat the Copper Pipe.Step 6: Touch the Solder to the Pipe.Step 7: Remove Flame from Fitting.Step 8: Clean the Fitting.

Can I solder over old solder?

Just heat the joint up with your torch, once the solder starts to melt use Channel locks to pull the fittings apart. Once the joint is apart, wipe as much old solder off as you can with a rag. Now you can start over. Clean, Flux, solder.