What role do filler metals play in welding?

Filler metals are essential in welding because they contribute significantly to the strength and integrity of the weld bond. When welded materials are fused together, the filler metal helps to fill any gaps, grooves, or spaces, ensuring a solid and cohesive joint. The chemical composition and properties of the filler metal can also enhance the metallurgical characteristics of the weld area, providing strength, resilience, and resistance to various stresses.

While there are other functions associated with different materials in the welding process, such as cooling or protective coatings, the primary purpose of the filler metal is to bolster the structural integrity of the weld. Therefore, its role is crucial for achieving a durable and reliable welded joint.