Abstract
Deep penetration laser welding is associated with the deposition of very high irradiation of a laser beam to a workpiece to form a slender capillary into the workpiece, denoted as a keyhole, as well as violent plasma generation which consists of metal vapour, ionized atoms, and free electrons. Plasma resides both outside and inside the keyhole, known as plasma plume and keyhole plasma, respectively. In this paper, we quantitatively characterize the plasma absorption of a laser beam inside the keyhole based on photodiode measurements and spectroscopic measurements in 20 kW-class CO2 laser welding processes. The results show that the plasma absorption of a laser beam cannot be neglected in certain welding conditions. Furthermore, this plasma absorption mainly occurs in the top portion of the keyhole, resulting in a wider weld shape in the top portion of the weld bead.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
