CMT - COLD METAL TRANSFER

Cold Metal Transfer and is a welding method developed by Fronius. It can be described as a development of MIG/MAG but where the wire moves back and forth and where this movement is an essential part of the process.

The control system also adjusts the current in line with the movement of the wire, all to minimize heat into the material. Of course, the weld is homogeneous and without pores/ dirt.

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CMT can be used for joining welding, brazing, etc., but Surftech uses this method exclusively for cladding.

The layer has a complete metallic bond with the base material while the mixing with the base material is very low. This makes CMT suitable for use in hard coatings and anti-corrosion coatings where the desire is that as little as possible of the base material is mixed in and “alloyed” to the coating.

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Compared to PTA, CMT is a significantly faster process but it adds more heat, while compared to MIG/ MAG and TIG it is cold.

There are many aspects to consider when choosing the right coating process, but in general it can be said that for difficult-to-weld materials and thin material thicknesses, PTA is the first choice, while larger solid parts that are to be coated with steel just as easily can be coated with CMT, which is more economical.