are primarily responsible for the progress of the human race. T e mining industry is not excluded from this phenomenon, but some areas of mining are. Looking at wear protection as an example, the same materials, ideas and philosophies have been followed for years without innovation. Haul truck tray liners are a good example. T e same materials that were used years ago are still in use today and the only innovation is to install thicker, heavier liners when wear life has to be increased.

Liner installation A chain is as strong as its weakest link. Even with the most advanced materials and products available, installation plays a vital role. When the installation technology fails, the solution fails. With wear protection, a failed liner results in aggravated wear of the sub-structure, causing direct equipment damage, unplanned maintenance and increased operating costs. T e general practice for installing haul

truck liner systems is to weld them in place. In essence, this is good practice, but due to



Not all wear solutions are created equal so it pays to take some expert advice, explain André Bouwer & Pieter du Plessis

he world we live in evolves, improves and innovates on a daily and sometime hourly basis. All industries and industry sectors share in these advancements and

structural deformations, fl atness of the tray structure is compromised and when installing a fl at liner on top of a warped structure, cavities exist between the liner and the structure. T ese cavities result in a loss of much needed structural support the tray body provided to the liner system leaving the liners free to move and deform as the tray is being loaded and unloaded. T is movement causes stress in both the liners and the welded joints causing premature liner and joint failures.

Old versus new Quenched and tempered (Q&T) hardwearing materials have been around for decades. T eir limitations are however situated in their

Technical advances mean that 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

A comparison between Welding Alloys’ Hardplate range of materials and BHN 500 Q&T material subjected to the ASTM G-65 wear test


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