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,,,,,,,,,,,11.1[1],,1.2,:1.2.1(HIC),,,,:;,;;;1.2.2(HAZ),(HeatAffectedZone,HAz),,,1.2.3,,,,(),22003,,,MG289,20mm,,2.1MG289MG289,,,,350mm400mm,3.2/4.0/5.0mmMG289:(1)(2)(3)(4)(5),,(6)2.2200811,,DN400,,0.5,,DN400,,2.2.16mm,,,110A,,3.2mmMG2892.2.235#50mm,3.2mm,MG289,,120A,,,2.2.3150mm,1.5mm,4mm,,20mm,2.3mm,MG2892.3.16mm,100mm(A3),,3.2mm,MG289,120A,,2P2.3.2,,10kgf/cm2,10min,,3MG289,,,,,,[1],,,,[J].,2009,(2):5760(510000):,,MG289:MG289:TG457.6:A:1674-098X(2009)12(c)-0005-01Researchontechniqueofleakstopingunderwaterforwater-supplypipelineLiangHanyan1XuZheng1(1.GuangzhouWaterSupplyEngineeringCompany)Abstract:Thispaperintroducedweldingtechniqueofleakstopingunderwateranditsdifficultiesforthecitywaternetworkleakageproblems,andgavetheengineeringcaseofapplicationofU.S.MG289specialcastironweldingrod.Keywords:weldingtechniqueofleakstoopingunderwater;water-supplypipeline;MG289