What is a key feature of bi-metal blades used in band saws?

A key feature of bi-metal blades used in band saws is their welded construction. Bi-metal blades are constructed by welding a strip of high-speed steel to a flexible back made from spring steel. This combination provides the best of both materials: the hard, wear-resistant qualities of high-speed steel for cutting edges, and the toughness and flexibility of the spring steel for handling and operation. This design enhances the blade's durability and life, enabling it to withstand higher heat and stress while cutting various materials.

Lower costs, metallic coatings, and high carbon content are not defining features of bi-metal blades. While some blades may have coatings to reduce friction or improve performance, it is not a defining trait of bi-metal construction. High carbon content is more relevant to carbon steel blades than to the specifically engineered metallurgical properties of bi-metal blades.