Quantcast inspection - TM-10-4130-239-14_180

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brazing - TM-10-4130-239-14_179
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REFRIGERATION SYSTEM SERVICE - LEAK-TEST
TM  10-4130-239-14 5-5. REFRIGERATION SYSTEM SERVICE -   BRAZING/DEBRAZING   (CONT) c. d. e. Parts shall be preheated with a neutral or slightly reduced flame to bring the entire joint uniformly to the liquid temperature of the filler metal. Use only as much heat as needed to provide a satisfactory joint. Avoid localized overheating. Keep moving the flame in small arcs or figure eights. Most of the heat should go to the joint where the filler material is to flow. Introduce filler material at the opposite side from the flame. Use capillary action to fill the joint while feeding the filler material. Do NOT use the flame to melt the filler material. If the filler material will not melt when brought in contact with the joint, then the joint is not clean or hot enough. Use a wet rag to wipe the joint clean of flux residue. Inspect completed joint for the following: 1. 2. 3. 4. 5. The contour of an outside filler joint shall be of a uniform radius with minimum excess filler material. Examine joint for pinholes. A pinhole is a defect caused by gases being expelled. It appears as a small, round, smooth- surfaced pocket on the surface of the filler material. Do not permit pinholes in any joint. Inspect for any residual flux on the surface of a brazed joint. Clean of necessary. Brazing filler material in excess of that required for the joint is acceptable providing the excess filler metal does not interfere with the function of the completed assembly. When possible, inspect inside the joint for filler material penetration. Filler must appear at all edges of a joint to prove proper flow through the joint. Lack of penetration shall be cause for rejection of the joint. 5-11

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