CAJ | 학술논문

在X80管线钢管环焊缝工艺评价试验基础上，统计分析了自保护药芯焊丝半自动焊接缺陷产生的比例；采用金相、扫描电镜和能谱分析等试验方法，观察了典型缺陷的形貌和缺陷中夹杂物的成分。结果表明，自保护药芯焊丝半自动焊接缺陷产生的几率较大，在环焊缝6点和12点位置的缺陷比9点位置的缺陷多。自保护药芯焊丝半自动焊的典型缺陷是夹渣、未熔合和气孔，呈“孔洞”形貌；“孔洞”中常伴随有夹杂物。提出了改善措施，保证长输油气管道运行安全。
재X80관선강관배한봉공예평개시험기출상，통계분석료자보호약심한사반자동한접결함산생적비례；채용금상、소묘전경화능보분석등시험방법，관찰료전형결함적형모화결함중협잡물적성분。결과표명，자보호약심한사반자동한접결함산생적궤솔교대，재배한봉6점화12점위치적결함비9점위치적결함다。자보호약심한사반자동한적전형결함시협사、미용합화기공，정“공동”형모；“공동”중상반수유협잡물。제출료개선조시，보증장수유기관도운행안전。
The ratio of defects of self-shielded flux cored wire semi-auto welding (FCAW) was analyzed statistically on the base of welding procedure qualification of X80 girth welds. The morphology of typical defects was investigated by optical metallographic microscope (OM) and field emission scanning electron microscope (SEM). And the components of slag inclusion in the defects were tested by energy-dispersive spectrometry (EDS) analysis. The results showed that the probability of defects for FCAW is high. The defects that come into being at 6 o’clock and 12 o’clock are more than at 9 o’clock. The typical defects for FCAW are slag inclusions, incomplete fusion and porosity. And the appearances of these defects are cavity, in which the slag inclusions are found. In order to assure the safety of the pipeline running, the effective measures had be propsed.