Assessment of an effective employment of infrared thermography as a non-destructive technique to evaluate quality of welded joints of automotive steel sheets
Thesis in external company
Thesis type EXPERIMENTAL, MODELING AND DATA ANALYSIS
Description 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)
Required skills bese mechanics, base of material processing
Deadline 13/02/2019 PROPONI LA TUA CANDIDATURA