Now, place a flare nut over the end of the tube with the threads closest to the end being flared. This can be accomplished with the use of an abrasive cloth (screen cloth, sand cloth, emery cloth or nylon abrasive cloth). Dirt, debris and foreign substances should be removed from the tube end to be flared by mechanical cleaning.
Reaming Prior to Flaring the Tube Endįailure to complete either of these steps can, lead to an inadequate seal of the flared joint and, ultimately, to joint failure.
Tube that is out of round prior to flaring should be resized back to round.įigure 9.3. After cutting, the tube must be reamed to the full inside diameter leaving no inside burr ( Figure 9.3). The copper tube must be cut square using an appropriate tubing cutter. It is possible to flare Types K, L or M rigid or hard temper tube, though prior to flaring it is usually necessary to anneal the end of the tube to be flared. When flaring Types L or K copper tube, annealed or soft temper tube should be used. The tool usually consists of flaring bars with openings for various tube sizes and a yoke that contains the flaring cone and a clamp to grip the flaring bars. Make sure to use a tool that matches the outside diameter of the tube being flared and that has the appropriate flare angle, commonly 45º (the physical characteristics of which should be in accordance with the Society of Automotive Engineers SAE J533 Standard - Flares for Tubing). A flare joint should be made with an appropriate tool such as those supplied by a number of tubing/piping tool manufacturers.
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