This mig90en is a dual purpose machine that offers the advantages of standard mig welding but without the need for gas bottles although it can easily be converted to use conventional shielding gases it is supplied with a special flux coated wire that produces it39s own gas shroud as it burns this feature simplifys its use and makes it more suitable for outside use since there is less chance of the breeze blowing away the shrouding effect of the gas download product manual