Identification of internal defects of hardfacing coatings in regeneration of machine parts

¹ Lublin University of Technology, Mechanical Engineering Faculty, Department of Production Engineering, 36 Nadbystrzycka Street, 20-816 Lublin, Poland
² Lublin University of Technology, Electrical Engineering and Computer Science Faculty, Institute of Computer Science, 20-618 Lublin, Nadbystrzycka 36B, Poland
³ Fundamentals of Technology Faculty, Lublin University of Technology, 38 Nadbystrzycka Street, 20-618 Lublin, Poland
⁴ POLFER Podzespoły Indukcyjne S.A., 25 Woźniki, 08-200 Łosice, Quality Department, Poland

^⁎ Corresponding author: e-mail: j.jozwik@pollub.pl

Abstract

The quality control of hardfacing is one of the areas where non-destructive testing is applied. To detect defects and inconsistencies in the industrial practice one uses the same methods as in the testing of welded joints. Computed Tomography is a type of X-ray spectroscopy. It is used as a diagnostic method that allows to obtain layered images of examined hardfacing. The paper presents the use of Computed Tomography for the evaluation of defects of hardfacing parts and errors. Padding welds were produced using GMA consumable electrode welding with CO₂ active gas. The padding material used were cored wires FILTUB DUR 16, and ones produced from a Fe-Mn-C-Si-Cr-Mo-Ti-W alloy. The layers were padded on to different surfaces: C45, 165CrV12, 42CrMo4, S235JR steel. Typical defects occurring in the pads and the influence of the type of wire on the concentration of defects were characterized. The resulting pads were characterized by occurring inconsistencies taking the form of pores, intrusions and fractures.