Copper Tube Handbook by T. N. Thomson

By T. N. Thomson

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Examples of solder joint end dimensions are shown in Figure 6, page 37. Cast alloy pressure fittings are available in all standard tube sizes and in a limited variety of types to cover needs for plumbing and mechanical systems. They can be either soldered or brazed, although brazing cast fittings requires care. Wrought copper pressure fittings are available over a wide range of sizes and types. These, too, can be joined by either soldering or brazing; wrought fittings are preferred where brazing is the joining method.

It frequently will be found desirable to use an oxyfuel, multiple-orifice heating tip to maintain a more uniform temperature over large areas. A mild preheating of the entire fitting is recommended for larger sizes, and the use of a second torch to retain a uniform preheating of the entire fitting assembly may be necessary in larger diameters. Heating can then proceed as outlined in the steps above. 50 Apply the brazing filler metal at a point where the tube enters the socket of the fitting. When the proper temperature is reached, the filler metal will flow readily into the space between the tube and fitting socket, drawn in by the natural force of capillary action.

FIGURE 18: Fluxing: Tube VI. SOLDERED JOINTS FIGURE 19: Fluxing: Fitting FIGURE 21: Removing Excess Flux Assembly and Support Heating Insert the tube end into fitting cup, making sure that the tube is seated against the base of the fitting cup (Figure 20). A slight twisting motion ensures even coverage by the flux. Remove excess flux from the exterior of the joint with a cotton rag (Figure 21). Support the tube and fitting assembly to ensure a uniform capillary space around the entire circumference of the joint.

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