Development and quality control of welding technology for thermal power unit

The paper introduces the development of material for the thermal power unit,the development characteristics of welding technology and welding quality control.The part of material development includes six stages,i.e.normal carbon steel,low alloy heat resistant steel,9Cr1Mo steel,T91/P91 steel,T92/P92 steel,new heat-resistant austenitic steel.The technology development consists of five characteristics.Firstly,the amount of welding work increases continuously and welding management steps to professional management mode gradually.Secondly,new steel emerges one after another.Along with the increase of the scale,the pressure and the temperature of the generating unit,all kinds of new steel emerge as the times requires.Thirdly,more attention is paid to the welding quality process control.Fourthly,new equipment and new technology emerge in endlessly.Fifthly,welding management becomes more and more standardized and institutionalized.In the part of quality control,the welding quality control measures are put forward from five aspects,i.e.the personnel,the equipment,the material,the method and the environment.