Is it steel pipe or angle grinder? If the angle grinder smells like glue on the plastic and copper core after the rotor is heated, it will disappear after a period of time. Then there is the smell of wear-resistant particles and adhesive during the grinding wheel wear. In short, as long as it is normal fever, it can be used, and there is no problem. Remember not to use oblique force when cutting to prevent the cutting piece from breaking. safety first