MIG Welding Wire Size's ??

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HI...My father is trying to do some welding using a MIG welding unit. One question we have is how do you know when to use 0.6mm wire or 0.8mm wire ??Does it just depend on how much weld you want to put on the joint ?? or is it to do with the thickness of metal your welding ???Any advice would be appreciated,ipad cases
Reply:The larger the wire size the greater the heat input and generally speaking the higher deposition. If you are doing auto body work , I would stick to the .6mm but if you want to do 1-3mm, then I would use the .8mm.
Reply:This is from Miller. It shows roughly the metal sizes and wire sizes they recomend. Sorry it's not metric. .024= .6mm, .030= .8mm, .035= .9mm for wire conversion.I use the .024 (.6mm) wire in my little 110v machine strictly for sheetmetal. I keep .030. (.8mm) wire in my 220v machine 90% of the time for general light work, and switch over to .035 (.9mm) if I have a lot of heavy work to do. Attached ImagesLast edited by DSW; 02-09-2010 at 06:38 AM..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan