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Question:

soldering copper pipes?

When installing a T fitting, are there any tips on which branch to start with? Verticle? Horizontal? Once I got to the last one, the first ones I did on the 3 way melted. Thanks

Answer:

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Start by heating the lowest joint. Heat rises. Like the others say heat until the solder just starts to melt on the opposite side from your torch. After you are done on all the joints try touching the solder back to the joints. If they are hot they will take solder again. This should take care of your problem. Also make sure to use flux in all your joints.
You are probably using a copper tubing cutter that is colapsing the Outside diameter of the tubing. That is a very common problem which is un-recognized by many. Take a tapered punch and insert it into the tubing after clearing the bur and roll it around in there expanding the tubing to a point where you need to push it onto the fitting. You be most surprised that by reducing the clearance to a few thousands of an inch between the tube and fitting will be so beneficial in stoping the run out of solder. The problem that ou have. Be sure to heat only the fitting mainly, not the tube that much. Solder flows towards the heat. Then wipe with a rag coated with flux and finally with a wet rag for perfect appearance.
All should be done pretty much at the same time. Fit all pieces together first, making absolutely certain you have cleaned and fluxed every joint. Then heat each fitting in the center. When the flame starts to flash green then the copper is hot enough to melt the soldier. Always touch the solder to the copper on the opposite side of where the flame is being applied.

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