Model Predictive Control of GTAW Weld Pool Penetration

Laser-Vision-Based Measurement and Analysis of Weld Pool Oscillation Frequency in GTAW-P

An innovative laser-vision-based sensing method is proposed to measure weld pool oscillation frequency in pulsed gas tungsten arc welding (GTAW-P). A low-power five-line laser pattern is projected onto the entire weld pool surface as well as its reflection is intercepted by an imaging plane and captured by a high-speed camera. By observing and analyzing the change of the captured laser images d...

Real-Time Measurement of Three Dimensional Weld Pool Surface in GTAW

Weld Pool Control in Nd : YAG Laser

Neurofuzzy model-based predictive control of weld fusion zone geometry

A closed-loop system is developed to control the weld fusion which is specified by the topside and back-side bead widths of the weld pool. Because in many applications only a top-side sensor is allowed which is attached to and moves with the welding torch, an image processing algorithm and neurofuzzy model have been incorporated to measure and estimate the top-side and back-side bead widths bas...

Robust Sensing and Control of Weld Pool Surface

Gas tungsten arc welding is the primary process for precision joining of metals. To develop a simple yet durable sensing and control system for this process, a novel sensor which requires no additional attachment is proposed to sense the depth of the weld pool surface using a non-transferred arc. To assure its effectiveness and accuracy, a flat surface is periodically established to provide a r...