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There's no particular magic required to solder a sweat fitting, though the very presence of a propane torch and hot pipe makes it a procedure that must be done carefully.
-Using the "fittings brush" (or emery cloth), clean inside the fitting to be soldered to the tubing.
-Using emery cloth, clean the outside end of the tubing to be soldered (clean same length of the tubing as will fit into the fitting).
- Using the "flux" brush, apply a thin coat of "flux" on cleaned end of tubing and inside cleaned fitting. Paste flux cleans, fluxes (draws the solder into the fitting), and prevents oxidation as the pipe is heated. It is lead free and can be used on all metals except aluminum and stainless steel. Water-soluble paste flux is ideal for working with supply lines for drinking water.
- Press the fitting onto the tubing until it "seats".
Adjust the torch until the blue part of the flame is about 1 to 2 in. long (this depends somewhat on the type of torch and tip you use).
- As you apply the heat, touch the end of your solder to the tubing (preferrably on the 'opposite' side from where you're applying the heat), just where it comes out of the fitting. When the fitting is hot enough, you'll see the solder melt and be drawn into the joint.
- Using the wet rag (with gloves), carefully wipe the joint.
- Check for leaks after the pipe has cooled.
Good Cheap if you're not doing a lot Cut pipe Pipe Cutter Hack saw Deburr Deburring tool Flat and round files Gloves Welding gloves Leather work gloves (I put them over a cotton glove)Links:
Tips for Soldering Copper Tubing: It Isn't as Hard as You Might Think! - Yahoo! Voices
How to Solder Copper Pipe - Summary: The Family Handyman
Soldering Copper Pipes | icreatables.comYouTube
Top 5 Reasons Silver Solder Doesn't Flow