103，about gasifier weld repair and base metal defect repair welding - doer equipment
classification：forum publishtime：2019-10-12 13:51:20
weld repair of gasifier and repair welding of base metal defects
1. the welds of gasifier that fail to pass the ndt must be repaired, and the inspection and testing must be carried out again after the repair.
2. the repair process must be prepared before weld repair. generally, the repair times of the same part shall not exceed twice. if it is necessary to carry out over repair, the repair process shall be approved by the chief engineer.
3. in principle, the repair shall be carried out before the final heat treatment of the product. if it is carried out after the heat treatment, the person in charge of welding shall decide whether to carry out the heat treatment again according to the repair depth.
4 the repair welding of base metal shall comply with the provisions of this procedure and shall be carried out in accordance with the provisions on weld repair and base metal repair welding of pressure equipment.
5 the number and position of weld repair and the ndt results after repair shall be recorded in the product manufacturing repair report of the quality certificate of pressure pipeline element assembly device.
re inspection and expansion inspection after weld repair: the inspection and inspection shall be carried out again after weld repair. the inspection method and qualification level shall be consistent with the original regulations. when the weld is repaired once, the inspection proportion shall be doubled on the original basis. if there are unqualified defects in the expansion inspection, the weld shall be 100% inspected, and the qualification level shall be consistent with the original regulations.
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