| KEYWORD |
Studio dell'applicabilitą di termografia a infrarossi come tecnica non distruttiva per i giunti saldati di lamiere sottili di uso automobilistico
Tesi esterna in azienda
Parole chiave NDT, SALDATURA, SPERIMENTAZIONE
Riferimenti FRANCESCA MARIA CURA', FRANCO LOMBARDI, RAFFAELLA SESANA
Tipo tesi MODELLISTICA-SPERIMENTALE, SPERIMENTALE IN LABORATORIO
Descrizione The welding process has a detrimental effect on joints of mechanical parts because of the formation of improper microstructures and/or of defects (e.g. cracks, incomplete penetration, and pores), both at a microscopic and macroscopic scale. Moreover, the tendency to use thin sheets to save weight in automotive applications (thickness lower than 1.2 mm) favors the occurrence of defects within joints.
The employment of thin steel sheets to produce car components and their assembly by fusion welding techniques lead to an increased need of quality controls. This is because fusion joints in thin components are more prone to the occurrence of welding defects more than traditional components made of thicker sheets. For ultra thin sheets (thickness lower than 0.8 mm), quality controls can be requested for all the joints of a component.
For these reasons, nondestructive inspections are needed to be time and cost effective, thus they should be suited for an automatic inspection.
Infrared thermography is one of the most promising thermal nondestructive technique (NDT) to detect defects in fusion joints.
This technique could be effectively used to detect defects in laser, arc and resistance spot welding joints in car body components with the aim of improving quality and, hence, mechanical properties of fusion joint.
The thesis aims at defininig the detection procedure and quantify the detection resolution of the thermographic technique in assessment of defects in welded joints
The thesis will be held in CRF (Orbassano, Torino)
Conoscenze richieste meccanica di base, principi di processo
Scadenza validita proposta 13/02/2019
PROPONI LA TUA CANDIDATURA