By American Welding Society
This Fourth variation of the Brazing guide is the fruits of numerous years of attempt by means of greater than a hundred brazing specialists. fabric from the 3rd variation of the Brazing handbook has been thoroughly reorganized and up-to-date. wide chapters on furnace brazing, brazing safeguard, and the corrosion of brazements were additional. Thermal growth info for a few brazing fabrics are incorporated within the Appendix.
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When plication. still larger aluminum additions are incorporated, brazing may not take place and the protective atmosphere must be made more Effect of Joint Length and Geometry on active (low dew point, lower vacuum pres- Clearance sures, a cleaner vacuum atmosphere or ad- As the joint length increases, the clearance dition of activators), or the surface must be must also increase, particularly when there protected with a barrier coating, such as is interaction between the filler metal and electrolytic nickel plating.
Or press fit. However, when the atmosphere deteriorates, it is often necessary to use larger clearances in order to obtain adequate flow; thus, identical clearance data and curves would not be expected from sources having a different quality protective atmosphere even though all other variables were identical. 5 show the optimum strength values for given clearances when employing a specific set of materials and brazing variables. Thus, it will be necessary to evaluate the brazing variables of the materials combination along with the specific production brazing facility.
Or other detrimental contaminants as this will seriously lower the joint strength. While grit blasting roughens the surface, it is not the roughness that assures flow through the joint. Tests on jet engine components have shown that it is the stress induced in the surface by blasting that improves the flow. Surfaces that are too rough (250 in. RMS) will also lower the joint strength because only the high points may braze; in effect the average clearance is too large. A surface roughness of 30 to 80 in.