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1、31一年级上册看图列式（一）二、专求左边的部分数。meetthestandardrequirements.Postweldheattreatmentofpipesafterheattreatment,hardnesstestsshouldbeconducted,hardnesstestsamplingofnotlessthan10%,hardness120%,15CrMohardnessofcarbonsteelpipeshallbelessthanbasemetalsteelafterheattreatment,hardnessshouldnotbegreaterth
2、antheparentmaterialof125%.Rateofpipelinenondestructivetestingshallbecarriedoutaccordingtothedesignrequirements,nonodesignrequirementstheSH3501-2002table10"percentageofradiographicexaminationofweldedjointsandacceptablelevel",andfixednumbernotlessthanthetotalnumberof40%weldinspection.Thisp
3、rojecthasawallthicknessof32mm20#steelhighpressuretube,x-rayscannotpenetrate,thesituationmaynotallownon-destructivetestingbyγ-ray,usedweldbackingandtwo-layerweldsbeforefilledbyxraydetectionmethod,theotherlayerbyultrasonicdetectormethod.Shouldbeconsistentwithexistingnationalstandardsforrad
4、iographictestingofthe...Gastankusedchainforthisprojectpromotedtheupsidedownconstruction.Chainreversalinstallationmethodshowninthefollowingfigure:weldersWeldersandweldingmethodstoparticipateinthisprojectshouldbeinaccordancewiththeMinistryofpersonnelissuedbytheboilersandpressurevesselsweld
5、erexaminationrulesforqualificationexamination,afterpassingthequalificationcertificateofweldingwork.Tankweldingmanualarcwelding,automaticwelding.Manualarcweldingcompanyhasanumberofexcellentwelder,tookpartinallkindsoflarge,mediumandsmallstoragetank,pressurevesselwelding,withrichexperience,
6、manualweldingcharacteristicsarenotsubjecttolocationrestrictions,weldingdeformationeasytocontrol.Thisengineeringweldingconstructionofshieldedmetalarcweldingmethods.31meetthestandardrequirements.Postweldheattreatmentofpipesafterheattreatment,hardnesstestsshouldbeconducted,hardnesstestsampl
7、ingofnotlessthan10%,hardness120%,15CrMohardnessofcarbonsteelpipeshallbelessthanbasemetalsteelafterheattreatment,hardnessshouldnotbegreaterthantheparentmaterialof125%.Rateofpipelinenondestructivetestingshallbecarriedoutaccordingtothedesignrequirements,nonodesignrequirement
