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Home/Perfect Welding/Focus on welding/Technologies/CMT Cold Metal Transfer 

CMT: Three letters that stand for the stablest weld process of Fronius.

The »cold« welding process CMT means outstanding results with all materials, an extremely stable arc, and precision process-control. What makes this possible is that compared to conventional MIG/MAG welding, this process really is »cold«. Or to put it more accurately, one that constantly alternates between hot and cold. This leads to immaculate results and boundless possibilities – such as spatter-free welding- and brazing seams, welded joins between steel and aluminium, welding ultra-light gauge sheets from only 0.3 mm (0.01 in) thick, and much else besides.

 
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Integrated wire motions
The digital process-control detects a short circuit, then helps to detach the droplet by retracting the wire – up to 90 times a second!


Extremely low thermal input
During welding, the wire moves forward – and as soon as the short circuit happens, it is pulled back again. This means that in the arcing phase, the arc itself only inputs heat very briefly.

No spattering
The rearward movement of the wire assists droplet detachment during the short circuit. The short circuit is controlled, and the current is kept small. The result: spatter-free metal transfer.

Extremely stable arc
The arc length is detected and adjusted mechanically. The arc remains stable, no matter what the surface of your workpiece is like or how fast you want to weld. This means that you can use CMT everywhere and in every position.

 
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CMT Pulse

This process combines a pulsed cycle with a CMT cycle and so inputs more heat. Introducing pulses in this carefully controlled, adjustable way results in a huge breadth of performance and flexibility.

 
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CMT Advanced

Even "cooler" than CMT. Here, the polarity of the welding current is made an integral part of the process-control. The polarity reversal takes place in the short-circuit phase, thereby ensuring the proven stability of the CMT process. The results: tightly controlled thermal input, extremely high gap bridge-ability and an up to 60% bigger deposition rate.

 
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CMT Advanced Pulse

By combining negatively poled CMT cycles and positively poled pulsing cycles, this process achieves absolute precision and the very greatest mastery of the arc.

 
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Download CMT brochures

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