Development of the plasma detecting system in CO2 laser welding

Yong Wang; Wuzhu Chen; Xudong Zhang; Guoqing Huang; Hongjun Zhang

doi:10.1117/12.237718

8 April 1996 Development of the plasma detecting system in CO₂ laser welding

Yong Wang, Wuzhu Chen, Xudong Zhang, Guoqing Huang, Hongjun Zhang

Proceedings Volume 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics; (1996) https://doi.org/10.1117/12.237718
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

An advanced plasma detecting system of CO₂ laser welding has been developed. The system consists of three sensors, signal processing, A/D data converting and photo-electric coupling units connected with a rapid personal computer. The Photocell Sensor (PS) detects the intensity of the blue light irradiated by the plasma. The Plasma Charge Sensor (PCS) detects the electric density of the plasma plume. The Microphone Sensor detects the sound pressure coming from the rapidly expanding vapor in the keyhole. All of the sensors can exactly distinguish three kinds of welding processes--heat conduction welding, deep penetration welding, unstable mode welding. When the welding parameters are given, the PCS signal depend on the distance between the welding nozzle and the workpiece, the PS signals are correlated closely to the focal point position. Three sensors can be used to control the focal point position (penetration depth) under given laser power and welding speed. In addition, the relation between detecting signals and penetration depth is given. The sensors of the system have features of simple structure, low cost and high sensitivity, which are especially suitable for on-line plasma detecting, quality controlling and off-line plasma analyzing of CO₂ laser welding.

Citation Download Citation

Yong Wang, Wuzhu Chen, Xudong Zhang, Guoqing Huang, and Hongjun Zhang "Development of the plasma detecting system in CO₂ laser welding", Proc. SPIE 2703, Lasers as Tools for Manufacturing of Durable Goods and Microelectronics, (8 April 1996); https://doi.org/10.1117/12.237718

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