本课题研究了建筑钢结构熔透对接焊缝中缺陷当量的分析方法和非裂纹类缺陷对焊缝正常使用的影响。
The research focuses on the defect equivalent analytical methods in building steel structure butt weld fusion and the effects of non-crack-type defects on the normal use of butt weld fusion.
结果表明：对于碳含量有差异的钢板，其显微组织、晶粒度及夹杂物等级均属正常，焊缝中未发现淬硬组织；
The obtained results indicate that the microstructure, grain-size and inclusion level of said steel plates were normal, hardened structure induced from quench had not been found;
废热锅炉是合成氨装置的重要设备之一，其炉管与大管板焊缝受高温高压及介质腐蚀，运行一年后会产生裂纹，影响装置的正常运行。
To find the cause of perforation corrosion in a boiler tube, the chemical composition, mechanical properties, microstructure of tubes, the corrosion product and the water quality have been analyzed.
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