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Due to their design, enclosed weld heads offer complete top layer protection of the weld joint due to continuous weld joint fluting during the welding process with protective gas. This reduces the joints’ tempering colours. A corresponding set of collets is also required for each tube outer diameter due to the design.

The wire cannot be fed cold. The welds are made in the I-joint with precise joint preparation (90° – saw cut, face if necessary). Advantage: Enclosed weld heads are comparably narrow and particularly suited to environments where space is tight.