FIREBAR Heaters Make New Wave Soldering Possible Problem: The printed circuit board industry has many uses for electric heat including coating the boards with solder. A manufacturer of wave soldering equipment had circuit boards travel along a conveyor system that passed over a solder pot. As the boards pass over, they're coated with a silver solder #6637, commonly used on PC boards. The solder is heated to approximately 500°F (260°C). Solution: Watlow approached this application from two angles. First, six FIREBAR ® elements were spaced across the bottom of the solder pot. This turned out to be a very effective way to get an even heat pattern across the entire pot. This solved the application for the most part, but more heat was needed along the pot's sides. The element was formed around

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