This is an essential process just before welding. This is employed to assure weld quality. Here conditions are more stringent and before direct current electrode negative GTAW, arc exerts no cleaning action. But before welding, surface contamination is to be removed. Washing and scrubbing with a detergent solution is one way for this. Oily contaminations can be removed by swabbing with cloths or cotton which is soaked in an approved nontoxic solvent. Removal oxide layers are possible by wire brushing, by steel wool, mill filer, portable milling tool or a scraper. Chemical treatment using butyl alcohol-phosphoric acid can also be employed
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