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锅炉安全监察规程和锅炉专业部颁83年标准规定,锅炉受压元件对接焊缝须经100％的无损探伤。凡发现超标缺陷,均须返修直至最终合格,以确保焊缝质量和锅炉安全。同时还规定,焊缝同一位置返修不得超过三次,以避党因多次返修而造成焊缝反热影响区应力集中和机械性能下降。为了给受压元件对接焊缝质量以定量的评定,《工业锅炉质量分等规定》要求考核“受压元件对接焊缝无损探伤一次合格率。”。尽管历次的《质量分等规定》对
Boiler Safety Supervision Regulations and Boiler Professional Envoy 83-year standard provides that the butt weld of boiler pressure components subject to 100% non-destructive testing. Where found excessive defects, must be reworked until finally qualified to ensure the quality of the weld and boiler safety. At the same time also provides that the weld repair the same location shall not exceed three times in order to avoid the party due to multiple rework caused by weld heat affected zone stress concentration and mechanical properties decline. In order to quantitatively evaluate the quality of butt-welded joints of compression elements, the Regulation on Quality Classification of Industrial Boilers requires that the assessment of “the first pass rate of non-destructive flaw detection of butt welds on pressured elements”. Despite all the previous “Quality Grading Provisions”