Defects Appearing in the Surfacing Layers of Abrasion Resistant

Abstract

The surfacing technologies are used for constitution of protection layer against wear and is destined for obtaining coating with high hardness. Among many weldings methods currently used to obtain the hard surface layer one of the most effective way of hardfacing is using flux cored arc welding. This additional material gives more possibilities to make expected hard surface layer. Chemical composition, property and economic factors obtained in flux cored wire are much richer in comparison to these obtained with other additional materials. This is the reason why flux cored wires give possibilities of application this kind of material for improving surface in different sectors of industry. In the present paper the imperfection in the layers was used for hardfacing process in different situations to show the possible application in the surface layer. The work presents studies of imperfection of the welds, contains the picture of microstructures, macrostructures and shows the results of checking by visual and penetrant testing methods.

Repair Welding of the Massive Cast

“…The mechanical properties of the steel such as homogenisation, normalizing, annealing, and quenching and tempering are improved by heat treatment. [1][2][3][4][5][6] …”

“…When the preheating temperature reaches the expected level the welding process begins. [1][2][3][4][5][6][7][8][9][10] …”

Review on hardfacing as method of improving the service life of critical components subjected to wear in service

“…The welding processes can be grouped as follows: Hardfacing by arc welding -shielded metal arc welding, submerged arc welding; hardfacing by gas welding -oxyacetylene gas welding; hardfacing by combination of arc and gastungsten inert gas welding (TIG), gas metal arc welding; powder spraying -flame spraying, high velocity oxyfuel process, electric arc spraying and plasma transferred arc welding; and laser hardfacing/laser cladding [14]. Some of the welding methods that have been successfully used to apply hardfacings on substrates are: gas tungsten arc welding (GTAW) [28], plasma arc welding (PAW) [29], laser beam welding [30,9], tungsten inert gas welding (TIG), gas welding [31], manual metal arc welding (MMAW) [32], shielded metal arc welding (SMAW) [13,18], and flux cored arc welding (FCAW) [33,34]. Shibe and Chawla [35] summarized the three types of hardfacing deposition techniques as thermal spraying, cladding and welding.…”

The Use of Numerical Modelling to Determine the Conditions of Regeneration of Medium Carbon Steel

“…The cracks that can occur in the regeneration process are unacceptable by quality standards. The causes of cracks can be: brittle microstructure in the HAZ or weld / padding weld, hydrogen diffuses, high level of tensile stresses [2,3,5,8,12].…”

“…For larger defects or for the thicker layer, the use of the efficient method with the solid or cored wires will be more effective. Regeneration has to recreate the features of the used element, and it should occur in a commercially reasonable manner [2][3][4][5]10,16,18,20,21,28].…”