1.0.1 This specification is applicable to the welding work of boiler, pressure piping, vessels and steel structures in the design , fabrication, erection and maintenance of thermal power generating plant (with unit capacity ≤600MW) of  electrical  power industry .

1.0.2 This specification is applicable to the welding technologies of manual arc welding, tungsten argon arc welding, flame gas welding and automatic submerged arc welding on carbon steel (with carbon content≤0.35%), common low-alloy steel and heat resisting steel. For other materials and welding technologies, technical requirements shall be drawn up according to this specification and relevant technical standards.

1.0.3 The erection & acceptance of foreign electrical power units shall be carried out according to this specification except that be specified in the construction contract.

1.0.4 Quality inspection of welding seam shall be carried out separately based on the working condition and quality requirements of components.

1.0.5 For inspection upon materials and welding joints of equipment , ball test, welding technology test , welding seam quality inspection and technical examination of welding operators shall be carried out according to corresponding regulations. 

1.0.6. In carrying out welding work , relevant safety, fire prevention , environment protection and other regulations shall be strictly observed.