Reclaiming Digester Screw after Wear
Keywords:
Welding, Hard-facing, HVOF, Hard coatings, Wear resistance, Weight loss, Cost benefit, Erosive wear.Abstract
Judicious repair maintenance of machine components subject to extreme wear conditions is always a pain to industry, especially when technology/ process clarity is not available. In the present article, the wear of the digestor screw in pulp and paper mills is discussed, from the angle of stipulating low-cost maintenance solution. Using three options, viz., electric arc welding, TIG welding and thermal spray (HVOF) processes were considered for repair and evaluated by characterizing wear (weight loss data). The performance of latter was considered the best and it was concluded that components sections which encountered maximum wear could be thermal sprayed. If, however, a larger build up was desired, the cheaper process of electric welding could be used as the electric welding and TIG welding responded better when higher layer processes were deployed evaluated to a maximum of three layers.
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