What is the purpose of the filler metal in GTAW?

The purpose of the filler metal in Gas Tungsten Arc Welding (GTAW) is to add material for strength and stability to the weld joint. When welding, the base metals are melted, and the filler metal is introduced to the molten pool. This contributes additional material, allowing for proper fusion between the components being joined and enhancing the overall mechanical properties of the weld. The filler metal not only reinforces the joint but also helps to ensure that the weld can withstand applied loads and stresses once it has cooled and solidified. Therefore, its incorporation is crucial for achieving a strong and durable weld.