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Furnace soldering (FS) encompasses a group of reflow soldering techniques in which the parts to be joined and preplaced filler metal are put in a furnace and then heated to the soldering temperature. This article describes three reflow soldering techniques in surface-mount technology, namely, vapor-phase reflow, area conduction, and infrared heating. These three techniques are considered as mass reflow techniques, because all of the solderable interconnections on the surface of a printed wiring board (PWB) assembly are brought through the reflow heating cycle simultaneously. The article explains four regions of reflow profile, namely, preheat (prebake), preflow (soak), reflow, and...

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