Metallurgy for Welders
The goal when welding any material is to change its microstructure as little as possible and to preserve its mechanical and chemical properties. To achieve this you must be able to determine its weldability, control the heat input, and prevent rapid cooling.
Webster’s dictionary defines metallurgy broadly as “the science and technology of metals.” But in practical terms, metallurgy affects the way you approach welding applications, the equipment and filler metal you use, and the challenges you face throughout the welding process. Not surprisingly, the metallurgical properties of a piece of metal—its mechanical strengths and chemistry—also determine how well, or if, it can be welded. From carbon and sulfur levels to tensile strength and the manner in which a given material is processed or reacts to heating and cooling, each element factors into the success or failure of a welding application.
When welding any material, your goal is to resist changing its microstructure and to preserve its mechanical and chemical properties. To do this, every welder should consider these key metallurgical issues before starting a job.