Double Thickness Flare

 

Double-thickness flares are formed with tools made for this purpose, Fig. 2-14 illustrates a cross-section through a simple block-and-punch type of tool used to make

Fig. 2-14. A cross-section showing a simple block and punch tool for forming double flares on copper tubing. A-The tube is clamped in the body of the flaring block. B-The first (female) punch bends the end of the tube inward. C-The second (male) punch folds the end of the tube down to form a double thickness and expands the flare into the final form. 

a double flare. The appear appearance of the double flare is shown in the final operation in this figure. Some flaring tools are fitted with adapters which makes it possible to form either single or double flares wi with the same tool. Fig. 2-15 shows such a tool.

Fig. 2-15. A flaring tool which, with necessary adapters, is capable of producing either single or double flares. (lmperial-Eas tman Corp.) 

Fig. 2-16 shows the step-by-step procedure for making a double flare. Double-thickness flares are recommended for only the larger size tubing (5/16 in. and over) and are not easily formed on smaller tubing. The double flare makes a stronger joint than a single flare.

Fig. 2-16. This shows the correct procedure for forming a double flare using the adapters with a combination single flare -double flare, flaring tool.