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MIG inverters require low input current, they are especially popular where only a single phase supply is available. These units are popular for both industrial and home use applications. Switched rectifiers require 30 amp continuous supply.
Straight answers to the questions people ask most when choosing a MIG welder that runs from a normal single-phase supply.
They suit workshops, garages, farms, mobile engineers and light fabrication where a standard single-phase supply is all you have. Modern inverter designs draw relatively little current for their output, so many can run from a normal socket or a suitable dedicated circuit.They are popular for both industrial and home use, and cover a wide range of work from thin sheet to moderate thickness.
An inverter converts the supply electronically, which generally makes the machine lighter and smaller, and often gives finer control of the arc. A conventional (transformer) machine uses a heavy transformer, so it is bulkier, but it is simple and robust.How much current each type draws for a given output varies between machines, so compare the input current and weight on the data plate and in the manual. For portability and a limited supply an inverter is often the better choice, while some people prefer a transformer design for rugged, simple workshop use.
Some smaller machines can, but many need a dedicated circuit with suitable protection, and some larger single-phase machines need a heavier supply than a normal domestic socket gives. Check the machine's input current and the supply and fuse or breaker rating it requires.Have a qualified electrician check the supply if you are unsure. Running a machine beyond what the circuit can supply causes tripping and can be dangerous.
It depends on the machine's output and the process. Smaller machines suit thin sheet and light fabrication, while larger single-phase units cope with thicker plate, especially with good joint preparation and multiple passes.Check the maker's stated capacity rather than relying only on the headline current, and remember that duty cycle limits how long you can weld at the top of the range.
A little extra capacity is often worthwhile, because a machine working well within its rating runs cooler, copes better with longer welds and gives room to grow. Very large machines use more power, are heavier and may need a stronger supply.Think about the thickest material you will weld and how continuously you will weld.
Duty cycle is the proportion of a ten-minute period a machine can weld at a given current before it must cool. Machines usually have a much higher duty cycle at lower current.If you weld for long periods at high current, choose a machine with a suitable rating. If the machine overheats, a thermal cut-out stops it until it cools.