Quality control of steel structure welding mainly includes

(1) Welding rod, flux and protective gas used for welding must meet the design requirements and special provisions for steel structure welding.

(2) The welder must be qualified by examination and obtain the certificate of corresponding welding conditions.

(3) The weld that bears tension or pressure and requires equal strength with the base material must be inspected by ultrasonic and X-ray flaw detection in accordance with the relevant national regulations.

(4) The surface of the weld is strictly prohibited cracks, slag, weld tumor, arc crater, pinhole and fusion spatter and other defects. Pneumatic holes and biting edges must be in accordance with the provisions of the construction specification.

(5) The appearance of the weld should be quality inspection, the requirements of the weld wave is more average, the obvious place of welding slag and spatter should be removed. The deviation of weld size and inspection method should be in accordance with the specification.

 

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