CMT welding is a variant of MIG/MAG welding. This process has been developed for applications where a controlled low level of heat transfer is desired. In ISO 4063 the process is referred to as process numbers 131 & 135
How does it work?
Cold Metal Transfer, or CMT welding, is a short-circuit arc process where another method of material transfer is used. With a conventional short-circuit arc weld, the short-circuit current is limited by a winding or by an inductive resistance at the source of the current itself. With the current source for CMT, the increase in the current after the short-circuit is limited by an electronic regulator.
The supply of welding wire is included in the electronic regulator. This way it is possible to ensure that the current and voltage are reduced almost to zero during the material transfer (see figure below).
The heat transfer is very small with CMT welding. The splatter is also greatly reduced thanks to the low short-circuit current. The electrode wire does not have to differ from the conventional MIG/MAG welding. The protective gas can also be the same as MIG/MAG for CMT welding. In general the CO2 content is higher – up to 100%.
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