1、 Process requirements Ordinary weld repair 1.1 If there are defects on the surface of the weld seam, they can be directly removed with an aluminum based grinding wheel. If the overall weld seam can also meet the standard requirements, welding is not required and the welding defects can be directly removed with a grinding wheel; 1.2 Welding defects in general welds can be repaired directly using welding methods, but for welding defects that cannot be repaired directly and still cannot meet the requirements, grinding wheels or washing cutting methods must be used to remove the defects before welding repair can be carried out; When repairing surface defects of welds, the repair length shall not be less than 50mm. Rigorous spot welding shall be used to repair defects such as porosity and undercutting; 1.4 The appearance of the repaired item shall not have any surface defects; The residual height of the repaired weld seam should meet the requirements of the original weld seam, and the width of the weld seam should not exceed twice that of the original weld seam. Both sides of the weld seam should smoothly transition towards the base metal. 2、 Acceptance criteria: The repair site should be inspected using the original testing method, and the repaired weld seam should meet the following requirements 2.1 After the repair or rework is completed, a visual inspection should be carried out in a timely manner, and surface slag, splashes, and other dirt should be removed before the inspection. The appearance of the weld seam should meet the specified standards. Welds that fail the appearance inspection shall not undergo non-destructive testing; 2.2 All welds must undergo 100% penetration inspection or 100% ultrasonic inspection; 2.3 Personnel engaged in non-destructive testing must hold qualification certificates issued by the State Administration of Technical Supervision that are suitable for their job responsibilities; 2.4 After passing the inspection, the inspector shall mark the repair area of the weld with the words "repair inspection qualified".
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