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step1 : Joint Design
Brazed joints should always have a capillary gap into which the molten filler
metal can flow. Joint strength will vary with the joint gap and the degree of
overlap between parent metals.
The optimum joint gap at brazing temperature is shown in the table of physical
properties for each product. Different expansion rates of the parent metals will
affect the joint gap at brazing temperature.
For lap joints, use an overlap length of 3 to 4 times the thickness of the thinnest
parent metal part in the joint. For tubular parts, the overlap should be one tube
diameter for sizes up to 1 inch diameter tube.
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