how to solder copper
Mia Russell
Updated on July 13, 2026
Heat the Fitting to Sweat the Copper Pipe
Light the propane torch.Put the tip of the flame against the middle of the fitting. Heat the opposite side of the fitting to ensure the heat is evenly distributed.Use the flame to heat the fitting. As soon as the solder melts, remove the flame.
What kind of solder do you use on copper?
What Type of Solder is Used for Copper Pipe? Lead free solder is best for copper pipes carrying drinking water. It will be free of elements you don’t want entering your drinking water. However it will require a higher melting point than a 50/50 solder.
Can I solder copper without flux?
If there really was no flux then you have a “cold” solder joint. The solder may stick in spots but it will not have “wicked” into the “sweat” joint properly and will not completely seal the joint.
Can you solder copper with a soldering iron?
You can fix it using a soldering iron, as long as you follow the basic rules of soldering copper wire and make sure you’re careful and attentive during the process.
How do you solder perfectly?
Step 1: Begin by making sure the tip is attached to the iron and screwed tightly in place. Step 2: Turn on your soldering iron and let it heat up. If you have a soldering station with an adjustable temp control, set it to 400′ C/ 752′ F. Step 3: Wipe the tip of the soldering iron on a damp wet sponge to clean it.
How do you join two pieces of copper together?
Joining two copper pipes without welding requires you solder a sweat fitting, or coupling, to connect the two pipes. This is done using heat, flux and solder. Soldering uses a flame as welding does, but the difference between the two methods is that soldering does not require heating the pipe until the metal melts.
How do you attach copper to copper?
Three ways to connect copper pipe:
Sweating sweating copper pipe (connecting with solder) is the conventional way.Sweating pipe with pre-soldered fittings.Push-to-Connect fittings.
Why does my solder not 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.
Can electrical solder be used on copper?
The metals commonly compatible with standard solder are copper, brass and tin. Metals that can’t be soldered include iron and aluminum. Plumbing solder resembles thick, heavy-gauge wire while solder for electronics is usually much smaller gauge, as thin as 0.064-inch.
Can you solder copper with propane torch?
I used a common everyday, readily available propane torch to solder the copper tubing together. You can get a cylinder of propane and the torch at any big box home improvement or hardware store.
Can you fuse copper together?
If you want to work with metals other than fine silver and pure gold, soldering is required. This copper ring is ready to solder. The copper solder (this kind already contains flux, so extra flux is not needed) is placed under the join, the piece is heated with the torch.
Can I use Vaseline as flux?
Can You Use Vaseline as Flux? Yes, Vaseline works just as well as commercial flux, and you can even buy a generic brand. Petroleum jelly is primarily made from waxes and mineral oils so that it won’t corrode your components. Plus, it cleans away the gunk and eliminates metal oxides that could compromise your bond.
What can I use as a substitute for flux when soldering?
Petroleum jelly is the best effective alternative to commercial flux. Its waxes and mineral water ingredients make it antioxidant thas why you can easily use it as a soldering flux.
Is soldering paste the same as flux?
Solder paste flux is different than liquid flux in both physical form and activity level. Solder paste flux typically contains 60-80% by weight active ingredients, compared with liquid flux’s 2-25%. By weight, a mixed solder paste commonly consists of 90% metal.
Can I solder with a heat gun?
As well as all kinds of other DIY jobs, a heat gun is very handy for soldering copper pipes. It’s most suitable for working with soft solder with a melting point below 400°C. Before soldering, you need to thoroughly clean and carefully assemble your workpiece, but you can easily do it yourself.
What temperature do you solder at?
Make sure the surfaces to be soldered are clean. Turn on the soldering iron and set temperature above the melting point of your solder. 600°- 650°F (316°- 343°C) is a good place to start for lead-based solder and 650°- 700°F (343°- 371°C) for lead-free solder.
Can you use welding wire for soldering?
Like many sheet metal terms, soldering and welding are used interchangeably. However, while these two operations are similar, their process and sub-techniques are different. The main difference between welding and soldering is melting. In soldering, metal fabricators heat the metal to be bonded but never melt them.