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Fig. 1 Typical well-brazed tube-in-tube joint in which the overlap is parallel, and meets the 3T-6T requirement for most metals.
Figure 1 shows a typical tubular joint, in which the inside, faying surfaces are parallel (gap-clearance is exaggerated for illustration purposes) and the two tubes have an overlap distance that meets the normal brazing requirement of 3T-6T overlap,...

Fig. 1 Thermal expansion curves for a number of different metals. Notice that each metal expands at a different rate than any of the other metals (This chart adapted from the American Welding Society’s AWS Brazing Handbook, 5th Edition, 1997, p. 29)
As described In previous articles I’ve written about the thermal expansion of metals, it’s important to note the obvious fact that all metals will expand (grow) when heated up, and then contract (shrink) when they are cooled. It was also noted that,...

Fig. 1 Pelletizing die with a rapidly rotating cut-off knife to cut off plastic being continuously extruded through holes in the die. (Photo courtesy of The Bonnot Company, Akron, Ohio).
Today’s brazing technology is based on a strong foundation of the brazing experiences of many people around the world over a period of many decades (even centuries). I’ve now been very active in the brazing world for almost 50-years, and, like my predecessors...

Fig. 1 Illustration of feeding BFM from one side of the joint and allowing capillary action to pull the molten BFM through the joint to the other side where it can be inspected. Drawing courtesy of JWHarris (Div. of Lincoln Electric).
There is an important guideline about brazing filler metals (BFMs) that needs to be followed when performing any kind of brazing — namely, it is very important to feed brazing filler metal (BFM) into only one side of the joint to be brazed, allow that...