A review and preliminary experiment on application of infrared thermography in welding

Abstract

Infrared thermography, as a convenient, non-contact, non-destructive and real-time detection method, has especially advantages for the welding technology because fusion welding always company with high temperature history. The aim of this publication is to review the state-of-the-art of instrumentation and methodology in the application of infrared thermography for welding, especially focusing on the welding quality control. Researches show that infrared thermography can be used to inspect weld joints and monitor the welding process, seam tracking, control the penetration depth and improve the quality of welds. The author also did some research and obtained some valuable results. Preliminary experiments are also carried out to acquire real time IR image and temperature profile in order to analyze the weld geometry and detect the welding defects.