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The cold metal transfer process (CMT) was introduced into industry more than 4 years ago. This process was developed to reduce heat transfer to the substrate during the welding of metals. The CMT process has distinct advantages over the conventional gas metal arc welding process (GMAW), in which the heat input is much greater. CMT was developed specifically for the dip transfer method, which until now has been notoriously difficult to work with. An example of a process which has been made easier through the use of CMT is the butt welding of thin sheet aluminium (0.3mm) using 1.2mm filler material. Unlike conventional processes, this can be achieved without the use of backing protection or heat sinks. Another example is the welding of mild steel using CO₂ as a shielding gas. With CMT, this can be done with a significant reduction in spatter.