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Straight answers to the questions people ask most when choosing and using a compact single phase multi-process welder.
It is a single unit that combines the power source and wire feeder, and can run more than one process. Usually that means MIG, stick (MMA) and often DC TIG, which is why some are described as 5 in 1 or similar. The exact processes depend on the model, so check the specification.They suit garages, farms, maintenance work and small workshops, where one machine needs to cover several jobs.
Many compact machines run from a single phase supply, and some can also run from a lower voltage supply, which is useful on site. Check the data plate for the voltage range, the current the machine draws and the fuse or breaker rating required.Draw at full output can be more than a small supply or an extension lead can safely give, so use a correctly rated lead and follow the maker's instructions. If you are unsure, ask a competent electrician.
It depends on the machine's maximum current, the process and the supply. As a general guide, compact machines are well suited to sheet and light to medium fabrication, with thicker material needing multiple passes or a bigger machine.Check the maker's guidance for the thickness range on the supply you have, because a machine running from a reduced supply gives less output than one on a full supply.
You can use either. Solid wire needs shielding gas, normally an argon and carbon dioxide mixture for steel. Gasless (self-shielded flux-cored) wire needs no cylinder, which is convenient for outdoor work and quick repairs, but it makes more smoke and slag, and the weld usually needs cleaning.The polarity differs between the two, so follow the instructions and check the lead arrangement or setting.
If the machine includes a TIG function, it will be DC TIG, which suits steel, stainless steel and copper. It will not weld aluminium, which needs AC. You also need a TIG torch, an argon supply and a regulator, and often a starting method such as lift arc.Check the manual to see how the TIG mode works and what accessories it needs.
Fit the electrode holder and work clamp, choose an electrode that suits the metal and joint, and set the current to the electrode maker's guidance. Strike the arc, keep a steady arc length and travel at a steady pace.Electrodes should be kept dry and stored as the maker advises. Stick welding is forgiving of rust, paint and wind, so it is a good choice for site repairs.