CMT Heat Input Minimization
The thermodynamic effect of the Cold Metal Transfer Welding process, where thermal impact on the base material is severely reduced through thermal relief during the short-circuit phase. This minimizes distortion in thin sheets.
CMT is basically a short-circuit arc process where the wire is actively retracted as soon as the short circuit occurs. This causes the droplet to be mechanically torn off, and the current can be reduced very early and quickly. The heat input into the sheet remains significantly lower than with normal short-circuit or even spray arc. This is particularly suitable for thin sheets and for joining galvanized sheets, because you get less distortion and less melting of the base material. You can also bridge larger gap widths without the weld pool running away. Make sure that the wire feed is cleanly synchronized with the arc phase, otherwise it will spatter. If you have the distance and speed under control, the part burns quietly and almost spark-free.