Read e-book online Copper Tube Handbook PDF

By T. N. Thomson

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Both annealed tube and hard drawn tube can be bent with the appropriate hand benders. The proper size of bender for each size tube must be used. For a guide to typical bend radii, see Table 13. The procedure for bending copper tube with a lever-type hand bender is illustrated in Figure 9. (A) With the handles at 180°F and the tube-holding clip raised out of the way, insert the tube in the formingwheel groove. (B) Place the tube-holding clip over the tube and bring the handle into an approximately right angle position, engaging the forming shoe over the tube.

Throughout this process you are using all three physical states of the solder: solid, pasty and liquid. For joints in the vertical postion, make a similar sequence of overlapping passes starting wherever is convenient. Solder joints depend on capillary action drawing free-flowing molten solder into the narrow clearance between the fitting and the tube. Molten solder metal is drawn into the joint by capillary action regardless of whether the solder flow is upward, downward or horizontal. 005 inch.

The amount of solder consumed when adequately filling the capillary space between the tube and either wrought or cast fittings may be estimated from Table 10, page 39. The flux requirement is usually 2 ounces per pound of solder. Cooling and Cleaning Allow the completed joint to cool naturally. Shock cooling with water may stress the joint. When cool, clean off any remaining flux residue with a wet rag (Figure 26). Whenever possible, based on end use, completed systems should be flushed to remove excess flux and debris.

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