Abstract
The paper presents problems related to the regeneration of wheel hubs for mining machinery vehicles carried out with arc welding using the MAG method. Hubs made of medium-carbon cast steel, type LII500, were weld surfaced with filler metal grade of G4Si. The tests were aimed at determining welding imperfections and metallographic properties of the surfacing welds. The influence of heat treatment on the properties of surfacing was investigated. Hardness distributions in welded hubs after various heat treatment operations were determined. Recommendations for the technology of weld surfacing the wheel hubs were formulated.
Highlights
The hardfacing processes are an increasingly used method of restoring operational properties of machine parts [7÷9]
The subject of the research was a regenerated wheel hub of a haulage truck, which is shown in figure 2
After the analysis of the chemical composition, it was found that the material of the hub corresponds to the mediumcarbon cast steel, type LII500, according to the requirements of PN-H-830152: 1985, and the padding weld material corresponds to a partial mixing of the cast steel with the G4S1 grade alloy wire
Summary
The hardfacing processes are an increasingly used method of restoring operational properties of machine parts [7÷9]. All machine elements are subjected to very heavy loads resulting from the large load capacity of haulage vehicles moving on uneven and heterogeneous ground. One of the most important parts of the suspension system of mining vehicles is the wheel hub. As a result of wear of the surface of the bearings, looseness in the suspension increases and the driving properties of the vehicle deteriorate significantly. Due to the different degree of wear of the wheel hub, two solutions are possible, namely replacement for a new part or its regeneration, which is a more economical option, but can improve the properties of the hub. An additional benefit is that repairs of mining machines can be made on site in an underground workshop
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