相关焊接方法对双相不锈钢焊接接头耐蚀性的影响

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1、学兔兔www.xuetutu.com机械制造文摘——焊接分册焊接现场焊接方法对双相不锈钢焊接接头耐蚀性的影响张三艳，张汇文(1．海洋石油工程股份有限公司，山东青岛266520；2．机械科学研究院哈尔滨焊接研究所，黑龙江哈尔滨150028)摘要：采用气体保护钨极氩弧焊(GTAW)、焊条电弧焊(SMAW)和埋弧焊(SAW)对2205双相不锈钢进行焊接，采用光学显微镜对接头组织进行观察，采用数点法计算铁素体相的含量，测定接头的耐点蚀和耐CO，应力腐蚀性能，研究焊接方法对接头耐蚀性的影响。结果表明，焊接方法影响焊缝组织形态及铁素体含量。GTAW焊缝由不规则的条状组织和两相交织分

2、布的块状组织组成，而SMAW和SAW焊缝为方位不一的条状组织和少量的块状组织。GTAW和SMAW焊缝的铁素体含量为35％～55％，而SAW的不足20％。接头的耐蚀性与铁素体相比例密切相关，GTAW、SMAW和SAW的耐蚀性依次降低。从铁素体相比例和耐蚀性角度考虑，GTAW和SMAW能够获得满意的焊接接头。关键词：双相不锈钢；焊接方法；焊接接头；耐腐蚀性能中图分类号：TG442EffectofweldingprocessoncorrosionresistancepropertiesofduplexstainlesssteelweldedjointZhangSanyan，Z

3、hangHuiwen(1．CNOOCEngineeringCo．，Ltd．，Qingdao266520，China；2．HarbinWeldingInstitute，Harbin150028，China)Abstract：Duplexstainlesssteel2205wasfabricatedbygastungstenarcwelding(GTAW)，shieldedmetalarcwelding(SMAW)andsubmergedarcwelding(SAW)respectively．Microstructurewasobservedbyanopticalmicro

4、scope，andthefeMtecontentwascalculatedusingcountingpointmethod．Moreover，thepittingcorrosiontestandresistancetostresscorosioncharacterizedbyCO2weremeasuredtoinvestigatetheeffectofweldingprocessonthecorosionresistancepropertiesoftheweldedjoint．THeresultsshowthattheeffectofweldingprocessonth

5、emicrostructuremorphologyofweldmetalandtheferritecontentisobvious．TheweldmetalwithGTAWconsistsofbothiregularstripmicrostructureandblockmicrostructurewithitstwophasesinterleavingdistribution，whiletheweldmetalwithSMAWandSAWiscomposedofagreatamountofstripmicrostructurewhosegrainorientations

6、aredifferentandasmallamountofblockmicrostructure．TheferitecontentoftheweldmetalwithGTAWandSMAWistherangeof35％一55％，whilethatoftheweldmetalwithSAWislowerthan20％．Thecorrosionresistancepropertiesoftheweldedjointarerelatedtotheferritecontent．Thecorrosionre—sistancepropertiesofGTAWarehighertha

7、nthatofSMAW，andthatSMAWarehigherthanSAW．Consideringtheferritephaseratioandcorosionresistanceproperties，GTAWandSMAWareprefered．Keywords：duplexstainlesssteel(DSS)；weldingprocess；weldedjoint；corrosioflresistanceproperties2014年第3期l9学兔兔www.xuetutu.com焊接现场机械制造文摘——焊接分册弧焊(MIG)、药芯