西气东输焊接工艺规范

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1、西气东输二线工程X80钢管半自动焊工艺研究黄福祥。，隋永莉，曾惠林(1．天津大学材料学院，天津300072；2．中国石油天然气管道科学研究院，河北廊坊065001)摘要：以西气东输二线工程用X80钢管为研究对象，通过焊接接头横向拉伸试验，焊缝和热影响区(HAZ)冲击韧性试验，焊缝和HAZ不同焊层显微组织分析，以及焊接接头不同焊层HvlO硬度试验等手段，研究了低氢型焊条根焊和自保护药芯焊丝半自动填充、盖面组合焊接工艺的环焊缝的焊接接头性能。试验结果表明，选择韧脆转变温度较低的自保护药芯焊丝、采用较小的焊接热输入量和多层多道的焊接措施等因素，对于保证X80钢管环焊接头的性能是至关

2、重要的。采用低氢焊条根焊、自保护药芯焊丝半自动焊进行X80钢管焊接时，焊接接头的强度、一l0℃低温冲击韧性和硬度等性能良好，该工艺应用于西气东输二线工程的焊接施工是可行的。关键词：X80钢管；环焊接头；自保护药芯焊丝电弧焊；半自动焊中图分类号：TG457．6文献标识码：A文章编号：1001—4837(2009)05—0013—05doi：10．3969／j．issn．1001—4837．2009．05．002ResearchonX80PipelineSteelSemi——automaticWeldingforWesttoEastGasPipelineIIProjectHUAN

3、GFu—xiang一．SUIYong一li．ZENGHui—lin’(1．SchoolofMaterialScienceandEngineering，TianjinUniversity，Tianjin300072，China；2．PipelineResearchInstituteofCNPC，Langfang065001，China)Abstract：TakingtheX80steelpipeutilizedinWesttoEastGasPipelineIIProjectastheresearchob-ject，thispaperstudiestheperformanceof

4、circumferentialweldingjointundertheweldingprocesswhichcombinedwithlow—hydrogenelectrodeforrootwelding，self—shieldedfluxcoredarcweldingforsemi—automaticfillingandcapping，throughseveralmethodssuchasthelateraltensiontesttoweldjoint，theimpacttoughnesstesttoweldseamandheat—affectedzone(HAZ)，them

5、icrostructureanalyzestodif-ferentlayersofweldjointandHAZ，aswellastheHvlOhardnesstesttodifferentlayersofweldjoint．Thetestresultindicatesthat，inordertoguaranteethecircumferentialweldingjointperformanceofX80steelpipe，itgsignificanttochooseself—shieldedflux—coredwirewithlowtoughnessandbrittlene

6、sstransitiontemperature，applylessweldingheatinputvalueandothermeasuressuchasmulti—layeredandmulti—passwelding．Usethelow—hydrogenweldingrodforrootweld．self—shieldedflux—coredweldingwireforsemi—automaticweldingtocarryonX80steelpipewelding，theintensity，impacttoughnessunder一10~Clowtemperaturean

7、dhardnessperformanceofweldjointsaregood．ItsfeasibletoapplythisweldingprocessforweldingconstructioninWesttoEastGasPipelineIIProject．Keywords：X80line—pipe；circumferentialweldingjoint；self—shieldedfluxcoredarcwelds；semi—au—tomaticwelding·13·CPVT西气东输二线工程X80钢