When selecting a multi-process welding machine there are a number of factors to consider and determine which welding machine will be the best fit. These include: 

Thickness of material 
Available power supply, for example, single phase or three phase 
Amount of available current 
Your welding application 

WIA and Miller multi-process welding machines offer both single phase and three phase solutions for a range of applications including, maintenance and repair operations, site fabrication, rural, trade/DIY and structural. 

WIA’s next generation of multi-process welding machines 

Featuring new digital technology WIA’s next generation Weldmatic 200+ and Weldmatic 250 multi process welding machines offer LCD screen technology and come with inbuilt pre-set paraments making the machine set up much quicker and simpler for less experienced welding operators. 

Resources: 

Eight tips for creating a good weld
Eight common weld problems and how to fix them