Infrared in-line monitoring of flaws in steel welded joints: a preliminary approach with SMAW and GMAW processes

Abstract The non-destructive full-field non-contact thermographic technique is applied for flaw detection of the welded joints, in real-time and offline configuration. In this paper, a procedure manual arc welding process presented. Surface temperature acquisitions by means an IR camera were performed during 8 specimen both calibration validation numerical model. investigated variables are (manual stick (SMAW) gas (GMAW) welding) joint shape (butt T joint) steel sound conditions with artificial flaws. Numerical simulation thermal transients was run to obtain expected surface fields behavior different parameter configurations. Hardness measurement micro-graphic analysis validate results. study weld pool gives direct indications anomalies; local studies transient profiles can detect some kind flaws; microstructural Heat-Affected Zone (HAZ) surrounding areas higlights presence austenite martensite distribution which justifies Comparing acquisition simulated contours processes provides information Since most flaws generated pool, it possible recognize anomalies directly from or post-processing acquired data.