What is "burn-through" in MIG welding?

"Burn-through" in MIG welding refers to the phenomenon where holes are created in thin materials due to excessive heat. This typically occurs when the welding arc is too intense or maintained for too long on a specific area of the thin material, leading to localized overheating. Consequently, the material can melt through, forming unwanted holes that compromise the integrity of the weld and the base metal.

Understanding the relationship between heat input and material thickness is crucial in MIG welding. For thinner metals, careful control of the welding parameters, such as voltage, current, and travel speed, is essential to prevent burn-through. When appropriate settings are used, proper penetration is achieved without compromising the material itself. This highlights the importance of skill and knowledge in managing heat during the welding process to avoid damage to the workpiece.