By Y. Zhou
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0-94, American Welding Society, Miami, FL (1994). 2. R. W. Rowe, “Fundamentals of Solid Phase Welding,” Metallurgical Reviews, 28(7): 433–480 (1962). 3. F. Tylecote, “Investigations on Pressure Welding,” British Welding Journal, 1(3): 117–135 (1954). 4. F. Tylecote, D. E. Furmidge, “The Influence of Surface Films on the Pressure Welding of Metals,” British Welding Journal, 5(1): 21–38 (1958). 5. R. G. R. Milner, “Pressure Welding by Rolling,” British Welding Journal, 6: 13–38 (1959). 6. A. Mohamed and J.
Then, knowing the stoichiometry of the oxide present, and using the appropriate phase diagram, some approximate solubility products for some different metals can be done directly. 2 lists some of these approximate solubility products for some standard engineering materials with their most common oxide. 9 Tm). Materials shown include Al, Fe, and Ti. These solubility products cover about 30 orders of magnitude, indicating, on one extreme, the difficulty dissolving Al oxide into an Al matrix, and the relative ease with which Ti can dissolve its own oxide.
The final process is the formation of the reaction layer. The formation of intermetallic compounds depends on the combination of filler metal and base metal. The conventional explanation of wetting is indicated in Fig. 5. The balance of several indices is indicated by the following Young’s equation. γsf = γlf cos θ + γls WPNL2204 Mechanisms of soldering and brazing 33 where γsf is the interfacial tension between flux and solid base metal, γlf is the interfacial tension between molten filler and flux, γls is the interfacial tension between molten filler and solid base metal, and θ is a contact angle.