The highlight presented by the Rofin Macro group is the Profile Welding System (“PWS�?): A complete system to weld tubes and profiles in which the sensor technology is integrated for detection of the welding gap and seam tracking.
Laser welding of tubes and profiles provides very narrow seams with fine-grain structures and nar-row heat effected zones. This means the heat treatment needed for further processing is often not required. In contrast to conventional TIG weld-ing, non-contact laser welding can achieve signifi-cantly higher process speeds. The welded seams withstand even very high stress levels without tearing.

The Profile Welding System consists of a beam guidance and sensor system, with PC-controlled linear axes, which are needed for reliable laser welding. All the functions required to operate the laser system can be controlled using an integrated PLC controller. These functions include the introduc-tion of process gases, the monitoring of the optical safety circuit, the complete system monitoring of the laser, and the associated cooling system. The moveable display unit attached to the support arm makes operation easy and clear.
Sensors for gap position recognition and seam tracking can detect even the slight-est discrepancies in the seam position. This ensures that the laser beam always follows the seam, guaranteeing high process reliability. Thanks to high-speed pre-cision linear drives, the PWS achieves position accuracies of a few ?m at produc-tion speeds of up to 60 m/min.
Standardized interfaces and compact dimensions enable simple integration - even into existing systems. The tried and tested beam guidance systems provides for safe operation under industrial conditions. The PWS is virtually maintenance-free and is not sensitive to oil, dirt, dust, damp and electrical interference – the best prerequisites for use in tough industrial environments.

The system is modular, allowing adaptations to customer-specific requirements and local circumstances. This means, for example, the beam guidance system can be adapted with a beam switch box or a beam splitter to enable simultaneous op-eration on various systems or at various welding points. Depending on the re-quirements, the PWS is fitted with optimized jet geometries in order to achieve the best possible application results. A weld head, which swivels about 30º, allows drag welding, which optimizes the process for high welding speeds. Other fea-tures, such as documentation of process data for quality monitoring purposes, can also be integrated on an optional basis.