Perfect digital process control is the prerequisite for the 'CMT' (Cold Metal Transfer) process. It 'detects' a short-circuit and assists droplet detachment of the filler metal using a characteristic reversing wire movement. The material transfer requires practically no current and takes place while the wire is being retracted, which breaks the arc, producing the typical 'hot-cold-hot-cold' pattern in a maximum 90 Hz cycle. Heat is applied to the metal during the short burn phase (hot). In the retract phase (cold), precisely one drop enters the resulting weld seam or weld pool. The results show virtually no spatter, less rework, no weld pool, less distortion and improved gap bridgeability. In practice, the benefits come into play when welding thin (CrNi) steels and aluminium sheets, joining heavy and light-gauge sheets, or steel to aluminium, and when brazing difficult joins.
Saving time and cutting cost
Welding and Cutting ; 8 , 2 ; 75-79
2009
5 Seiten, 10 Bilder, 2 Tabellen
Article (Journal)
English
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