Which of the following is considered a disadvantage of MIG welding?

MIG welding, or Metal Inert Gas welding, is known for its efficiency and versatility, but one of its main disadvantages is the less control over heat input. This lack of control can lead to issues such as burn-through on thin materials and poor penetration on thicker sections.

When using MIG welding, the continuous feed of wire can create a more stable arc, but it also means that the welder has to be careful with the settings, as there is a tendency for the heat to build up quickly. Unlike some other methods, MIG welding does not allow for as fine-tuned adjustments to the heat input on the fly. As a result, operators may find it challenging to maintain the right balance of heat, particularly when working with varying materials, thicknesses, and joint configurations.

This is not an issue with high welding speed, the requirement for flux, or limitations to thin materials, as those factors pertain to different aspects of the welding process and its applications. High welding speed is generally seen as an advantage, while the use of flux is more applicable to different welding processes like flux-cored arc welding. MIG welding is actually well-suited for a range of material thicknesses, so it is not limited to just thin materials.