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A GMAW welding machine, also called a MIG welding machine, is a semi-automatic or automatic power supply used with a continuous wire as an electrode and an inert or semi-inert gas mixture to protect the weld from contamination. GMAW operator’s head and hands should be protected due to weld spatter and UV radiation.
The GMAW process works by creating an electric arc between a solid wire electrode and the metal workpiece. The heat of the arc melts the workpiece metal, facilitating the joining of two parts. The wire is consumable, feeding the filler metal to the joint to form the weld. Externally supplied shielding gas is used to protect the weld from contamination.
The advantages of using a GMAW welding machine include its versatility, as it can weld various metals and thicknesses, and has high productivity, with a superior deposition rate relative to equipment weight. It produces fewer welding fumes, creates high-quality welds, and requires little to no post-weld cleaning. Additionally, GMAW can be used in all positions and is easy to operate, offering smooth starts, stops, and clean restarts, making it a practical choice for efficient and reliable welding.
Some factors should be put into consideration before purchasing a GMAW machine: the type and thickness of the metal to be welded, power supply, size and portability of the machine, the price, and quality of the machine.
To keep a GMAW welding machine in optimal working condition, regular maintenance is essential. This includes cleaning the machine, especially the gun liner, replacing worn-out parts promptly, and ensuring all electrical connections are secure. Regularly check the gas supply for consistency and store the machine in a clean, dry environment to prevent damage.