MIG Welding vs Flux Core – What’s the Difference

MIG Welding vs Flux Core

Welding is an essential skill used in the industry for decades. Over time, new welding techniques have been introduced, and new equipment has been developed to make the process smoother and more efficient. MIG welding and Flux Core welding are two of the most commonly used welding techniques, but what’s the difference? This blog post will answer that question by comparing the two techniques point by point.

Difference Between MIG Welding and Flux Core

Shielding Gas

The primary difference between MIG welding and Flux Core welding is the shielding gas used. MIG welding uses a shielding gas to protect the welding area from atmospheric gases like oxygen and nitrogen. Flux Core welding, on the other hand, creates its shield using a flux contained within the wire’s core.

Welding Wire Size

MIG welding typically uses smaller wire diameters compared to Flux Core welding. The smaller wire diameter used in MIG welding is more suited to welding thinner materials. In contrast, Flux Core welding uses a larger wire diameter better suited to thicker materials.

Power Source

MIG welding usually requires more power compared to Flux Core welding. MIG welding requires a stable arc to keep the shielding gas in place. A stable arc requires more power to maintain than what is required for Flux Core welding.

Welding Speed

MIG welding is generally faster than Flux Core welding as it can produce a cleaner and more precise weld. The higher precision makes MIG welding more efficient and faster than Flux Core welding, which is prone to spatter and requires more clean-up.

Welding Applications

MIG welding suits various applications, including automotive repairs, fabrication, and general metalwork. Flux Core welding is typically used for outdoor welding applications, as it can cope with wind and other environmental factors. It is also commonly used for welding thicker metals in heavy equipment and structural steelwork.


In summary, MIG and Flux Core welding have similar arc welding techniques. However, the primary difference is in the shielding gas used. MIG welding requires an external gas source, while Flux Core welding uses a flux contained within the wire. Other differences include the wire diameter, power source requirements, welding speed, and the type of applications to which they are best suited. Both techniques have strengths; the choice will depend on the specific welding project’s needs.

Harsh Jain

Harsh Jain

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