New method for process monitoring in high-power simultaneous laser beam welding

Bernd Seidel; Christian Koerber; Klaus Behler; Eckhard Beyer

doi:10.1117/12.251196

23 September 1996 New method for process monitoring in high-power simultaneous laser beam welding

Bernd Seidel, Christian Koerber, Klaus Behler, Eckhard Beyer

Proceedings Volume 2789, High-Power Lasers: Applications and Emerging Applications; (1996) https://doi.org/10.1117/12.251196
Event: Lasers, Optics, and Vision for Productivity in Manufacturing I, 1996, Besancon, France

Abstract

Simultaneous laser beam welding is a modified procedure of both sided laser beam welding. Two laser beams are focused in opposite direction at the same time and place onto the workpiece. The process is characterized by the formation of a joint keyhole opened to both sides of the workpiece. The main advantages in comparison with conventional laser welding processes are higher welding speed, avoidance of angular distortion due to a symmetrical field of thermal stresses, as well as minimum porosity, especially in the middle of the seam volume, and a high degree of process stability. The advantages are depending on the joint keyhole. In the case of small adjustment of the two beam axes combined with inappropriate parameter settings this joint keyhole can collapse into two separated keyholes each having only an opening to one side of the workpiece. Therefore the process state with 'joint keyhole' has to be monitored. According to this criterion a non-destructive on- line measurement technique has been developed. The measurement technique is based on RF-frequency modulation of one of the two applied laser beams. Since the results of the measurement are available in very short time scales a usage for on-line control is possible.

Citation Download Citation

Bernd Seidel, Christian Koerber, Klaus Behler, and Eckhard Beyer "New method for process monitoring in high-power simultaneous laser beam welding", Proc. SPIE 2789, High-Power Lasers: Applications and Emerging Applications, (23 September 1996); https://doi.org/10.1117/12.251196

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available