Repairing a leaky copper water pipe elbow generally involves removing and replacing the leaky elbow fitting. For one reason or another, the solder surrounding the existing elbow fitting may have failed beginning with a small leak. Small leaks over the period of days or weeks can grow. Copper pipe fittings are soldered into place; the existing solder is remelted in order to remove the existing elbow fitting. A new fitting must be soldered into place in order to make the joint leak resistant again. Only the correct tools are needed to complete this project—not an expensive licensed plumber.
Allow the joint to heat up for a few minutes. When the solder melts and liquefies, pull the elbow fitting away from the ends of the copper pipes that help create the joint. While the copper pipe is still hot, wipe the excess solder away with a damp cloth rag. Remove excess solder from the elbow fitting as well.
Place a new copper fitting over the ends of the two pipes. Reapply the flame from the BernzOmatic torch to the copper pipe and fitting for a few minutes, or until the copper is hot enough to melt solder on contact. Touch the end of a piece of solder directly to each joint running solder around the whole joint on both copper pipes.