TPSi · 1515TPS0063

CMT – COLD METAL TRANSFER: THE COLD WELDING PROCESS FOR PREMIUM QUALITY

Extremely low heat input and an exceptionally stable arc set CMT apart from
conventional MIG/MAG welding. The Fronius CMT (Cold Metal Transfer) welding
process allows users to achieve optimum results when joining different materials,
for example steel and aluminium.

A WEALTH OF WELDING BENEFITS FOR THE USER

The digital process control detects a short circuit and then helps to detach the
droplet by retracting the wire: during welding, the wire moves forward and is
pulled back again as soon as the short circuit occurs. As a result, the arc only
introduces any heat for a very brief period during the arc-burning phase. The
short circuit is controlled and the current is kept low, resulting in a
spatter-free material transfer. The arc length is detected and adjusted
mechanically. The arc remains stable, no matter what the surface of the workpiece
is like or how fast the user welds. This means CMT can be used everywhere and in
every position.

DIVERSE, HIGHLY INTERESTING AREAS OF APPLICATION

CMT welding is ideal for joining steel and aluminium, as the galvanised steel
plate is wetted by this braze-welded joint, while the aluminium melts. Furthermore,
the CMT welding process is also suited to the virtually spatter-free brazing of
hot-galvanised and electrolytically galvanised sheets with a welding wire made
from a copper-silicon alloy. Minimal distortion of the galvanised sheet occurs
and the light-gauge welding of aluminium sheets (from 0.3 millimetres) is also
possible, whereby the low heat input eliminates the need for pool support. Equally
impressive results are achieved when welding stainless steels and magnesium.

This highly specific type of droplet detachment minimizes heat input. The reversing
wire electrode movement also ensures less spatter formation.

Caution:
Welding Process LSC is only possible in combination with Welding Package Standard AND Welding Package Pulse!