Heat Checking of Tool Joints : A condition that exists when a tool joint is excessively heated by the friction caused by rotation against the wall in the borehole. (Bul D20).
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}