An MMA welding machine uses arc heat to join two pieces of metal. The parent metal and the electrode combine to form a solid mass. The welding process starts with the core wire, which is a consumable, and continues with the main metal electrode, which supplies the filler metal. This welding process can join most metals, but is especially good for moderate and high-carbon steels.

The MMA welding machine has some special features. The hot start function provides a surge of peak current at the beginning of the welding process. This is especially helpful with electrodes that are hard to start or are imperfectly shaped. This function also stabilizes the arc and provides peak current in case of a short circuit.

An MMA welding machine can be used to weld a wide range of materials, including steel and stainless steel. It can also be used to weld cast materials. MMA welding machines can be portable

The latest MMA welding machines also offer advanced features. These machines are designed to produce a high amount of current in a small footprint. They also feature inverter technology, which allows the operator to control the arc voltage electronically. Inverter-powered MMA welders are lightweight and compact, and they have excellent characteristics and efficiency. Many of these machines can also be fitted with a TIG torch with valve. Some even offer LIFT trigger welding capabilities.