WELD POOL GEOMETRY SENSING AND CONTROL IN ARC WELDING

2002 ◽  
pp. 167-199
Author(s):  
Hong Luo ◽  
Rajagopalan Devanathan
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Weld Pool Geometry ◽  
And Control

Sensing and Control of Weld Pool Geometry for Automated GTA Welding

1995 ◽  
Vol 117 (2) ◽  
pp. 210-222 ◽  
Author(s):  
R. Kovacevic ◽  
Y. M. Zhang ◽  
S. Ruan
Keyword(s):  
Real Time ◽  
Weld Pool ◽  
Gta Welding ◽  
Image Features ◽  
Nitrogen Laser ◽  
Pool Surface ◽  
Weld Pool Geometry ◽  
Difficult Procedure ◽  
Robust Adaptive ◽  
And Control

Weld pool geometry is a crucial factor in determining welding quality, especially in the case of sheet welding. Its feedback control should be a fundamental requirement for automated welding. However, the real-time precise measurement of pool geometry is a difficult procedure. It has been shown that vision sensing is a promising approach for monitoring the weld pool geometry. Quality images that can be processed in real-time to detect the pool geometry are acquired by using a high shutter speed camera assisted with nitrogen laser as an illumination source. However, during practical welding, impurities or oxides existing on the pool surface complicate image processing. The image features are analyzed and utilized for effectively processing the image. It is shown that the proposed algorithm can always detect the pool boundary with sufficient accuracy in less than 100 ms. Based on this measuring technique, a robust adaptive system has been developed to control the pool area. Experiments show that the proposed control system can overcome the influence caused by various disturbances.

Sign in / Sign up

Export Citation Format

Share Document