How to Weld Copper Tubing

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    • 1). Measure the length of the pipe and cut it with a hacksaw or tube cutter.

    • 2). Sand the exterior of the end of the pipe with emery cloth or steel wool.

    • 3). Clean the inside of the pipe fittings with a round wire brush. Removing dirt and grease from where the copper will be joined makes a better seal.

    • 4). Spread a thin layer of flux onto the last inch of the copper pipe with a flux brush.

    • 5). Slide the pipe into the fitting until you reach the bottom, twisting the fitting to spread the flux across the surface of the pipe.

    • 6). Heat both sides of the fitting where you inserted the copper tubing with a propane torch. Apply the flame until the flux begins to bubble and sizzle.

    • 7). Touch the solder to the pipe, pulling it across the joint. The solder immediately should melt and be sucked up into the joint.

    • 8). Wipe away any excess solder with a rag.

    • 9). Turn on the water and check the joint for leaks. If the joint leaks, take it apart and re-solder it.

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