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Placing the weld in the bottom of a tooth gullet when welding band saw blades is essential for several reasons. The gullet is designed to collect and remove the material that is being cut by the blade. By positioning the weld here, it minimizes the disruption to the cutting action of the blade. Furthermore, the gullet is typically thicker than the rest of the blade, providing a stronger area for the weld, which can help prevent premature failure during operation.

A weld made in this location also ensures that the blade maintains its balance and integrity. When blades are used for cutting, they experience significant strain, and having the weld in the gullet reduces the risk of weak points that can occur if a weld were placed at other locations, such as the top or edge of the blade, which could lead to issues like blade warping or uneven wear.

Additionally, placing the weld near the edge or on the top provides less stability and could potentially create a geometry that impacts cutting accuracy. Therefore, positioning the weld in the bottom of the tooth gullet is the best practice for both performance and longevity of band saw blades.