University of Twente Student Theses


Influence of airflow on weld depth obtained with fiber laser

Pocorni, Jetro K. (2011) Influence of airflow on weld depth obtained with fiber laser.

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Abstract:During fiber Laser welding at power levels between 4-6 kW, a deeper weld was obtained if air was blown above the weld. Previous research showed that air blows away a tall heated zone above the weld. This heated zone has a low refractive index, and defocuses the Laser beam. In this report the weld depth was measured as a function of different air velocities ranging from 0-35 m/s; the corresponding air consumption was also noted. The measurements were done by positioning a nozzle at various heights. Also, multiple nozzles were stacked above each other to form a tall air profile. Air was blown perpendicular and parallel to (opposite to and in the same direction as) the weld direction. The weld depths increased up to 2 mm while air was blown above the weld. The application of air enables deeper welds while maintaining the same Laser power. Thus, for a deeper weld, the weld speed can be increased and productivity improved.
Item Type:Internship Report (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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