What is a potential cause of uneven weld bead?

An inconsistent torch angle during MIG welding can lead to an uneven weld bead due to the way it affects the arc dynamics and heat distribution. When the torch is held at varied angles, it can alter the distance between the welding wire and the workpiece, influencing the penetration and bead shape. A consistent torch angle ensures that the heat is applied uniformly across the joint, which is crucial for achieving a smooth and uniform weld appearance. Additionally, the angle affects the direction of the molten pool as the welder moves along the seam, potentially leading to defects or an uneven profile if not maintained correctly.

While other factors such as shielding gas flow, clamping pressure, and material thickness can impact weld quality, the direct relationship between the torch angle and bead formation highlights why maintaining that angle consistently is essential for producing high-quality welds.