Petrol Welding Generators: MMA Welding and Auxiliary Power

Most models are designed for DC MMA welding with coated electrodes, and some also support TIG Lift. Models with inverter control give a more stable arc and are lighter. For comparison, see how to choose an inverter welder.

Maximum welding current is usually 160–300 A; also check the duty cycle at maximum current, typically 35–60%. Smooth current adjustment matters for both thin and thick metal. Read how to choose welding current.

Models rated at 160–200 A suit 2.5–3.2 mm electrodes, while 250–300 A models handle electrodes up to 4–5 mm for thick metal. Also check hot-start and anti-stick functions. Read how to choose welding electrodes, wire and shielding gas.

As generators, these units usually provide 2–6 kW at 220 V, sometimes with a 380 V output as well. Calculate the power of the tools you will connect, and remember that auxiliary output drops while welding. See how to calculate required generator power.

They usually use four-stroke engines of 210–460 cm³ rated at 5–12 kW (7–16 hp), and diesel versions are available for heavy-duty work. Read differences between two-stroke, four-stroke and diesel engines and engine displacement, power, torque and RPM: how to compare engine-powered equipment.

Besides a manual recoil starter, an electric starter is often fitted. A 15–25 l tank usually lasts 5–10 hours, and low-oil shutdown protects the engine from damage. Read fuel, engine oil and two-stroke mix: how to choose and use them correctly.

Work only outdoors, ground the unit and use a welding helmet, gauntlets and flame-resistant clothing. Read how to choose welding PPE, how to use a welder safely and how to safely use internal-combustion-engine tools and equipment.

Change the engine oil regularly, clean the air filter and check the spark plug, and keep welding cables and clamps clean and undamaged. Read how to store and maintain a generator and how to choose spare parts for gasoline and diesel engines.