properties and manufacturing processes. T ese are in essence low-alloy steels that have been heat treated to high hardness. With hardness not being a direct measure of wear resistance, they fall short when compared to hardfaced plate, which has also been around for some time, but exhibit a complete diff erent structure where ultra-hard carbides are embedded in a softer, more ductile matrix. T ese materials can be compared to the structure of a tar road, where the much harder crushed rock particles provide the bulk of the road’s properties. Without these rock particles, the road will not last nearly as long. Due to their metallurgical structure, WA Hardplate liners

have a wear life of up to 10 times that of Q&T material and can very often be much thinner then their Q&T counterparts, resulting in a substantial weight advantage.

Innovative approach T e Welding Alloys Group (WAG) prides itself on being a leader in the fi eld of wear protection materials and solutions. Makuri IMD is an innovative solution, aimed at wear protection in large-dig load and haul equipment for the mining and earthmoving industries. Instead of a product, Makuri IMD focuses on the three main aspects of successful wear protection, these being installation (I), materials (M) and design (D). A longer lasting liner system ensures a lower operating

cost. In a perfect world, the optimum wear life of Hardplate overlay materials is measured from date of installation until the entire Hardplate overlay has been worn away. T e perfect world does not exist, but striving towards it does. T rough innovative designs, advanced materials and optimised installation, liner systems can now stay in place for longer by fi lling the cavities between the fl at liners and warped or damaged equipment structure with a backing compound or grout. Deformation of liners, increased stresses in welded joints and localised or preferential wear are greatly reduced. Dangers of misplaced liners due to weld failure are that they typically end up inside crushers, damaging or clogging downstream equipment or cutting through conveyor belting. As the famous saying goes, “insanity is doing the same

thing over and over again and expecting diff erent results.” T rough innovation, advanced wear-resistant materials, equipment-specifi c designs and optimised installation techniques, the Makuri IMD liner system provides what its inventors believe to be the lowest operating cost per ton of any liner system available, adding value through cost of ownership to large-dig load and haul equipment. ●

André Bouwer is with Welding Alloys South Africa & Pieter du Plessis is with Integra (Welding Alloys Group).

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