Mild steel is the most common of all the materials and covers the biggest range of uses due to its ductility and malleability. Mild steel can be welded by all four processes consisting of T.I.G, M.I.G, GAS and Arc (aka stick welding) M.I.G welding is the most preferred process as it creates less distortion, its cost effective and a much quicker process, for higher quality work T.I.G is used. For cast iron/steel MMA is used because of the different compositions of welding rod as cast parts are renowned for using dissimilar material. GAS welding is used very rarely as it is a slow process and creates a lot of heat into the materials causing in most cases uncontrollable distortion so M.I.G is always usually preferred.