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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,hardnessshouldnotbegreate
2、rthantheparentmaterialof125%.Rateofpipelinenondestructivetestingshallbecarriedoutaccordingtothedesignrequirements,nonodesignrequirementstheSH3501-2002table10"percentageofradiographicexaminationofweldedjointsandacceptablelevel",andfixednumbernotlessthanthetotalnumberof40%weldinspection
3、.Thisprojecthasawallthicknessof32mm20#steelhighpressuretube,x-rayscannotpenetrate,thesituationmaynotallownon-destructivetestingbyγ-ray,usedweldbackingandtwo-layerweldsbeforefilledbyxraydetectionmethod,theotherlayerbyultrasonicdetectormethod.Shouldbeconsistentwithexistingnationalstanda
4、rdsforradiographictestingofthe...Gastankusedchainforthisprojectpromotedtheupsidedownconstruction.Chainreversalinstallationmethodshowninthefollowingfigure:weldersWeldersandweldingmethodstoparticipateinthisprojectshouldbeinaccordancewiththeMinistryofpersonnelissuedbytheboilersandpressur
5、evesselswelderexaminationrulesforqualificationexamination,afterpassingthequalificationcertificateofweldingwork.Tankweldingmanualarcwelding,automaticwelding.Manualarcweldingcompanyhasanumberofexcellentwelder,tookpartinallkindsoflarge,mediumandsmallstoragetank,pressurevesselwelding,with
6、richexperience,manualweldingcharacteristicsarenotsubjecttolocationrestrictions,weldingdeformationeasytocontrol.Thisengineeringweldingconstructionofshieldedmetalarcweldingmethods.31meetthestandardrequirements.Postweldheattreatmentofpipesafterheattreatment,hardnesstestsshouldbeconducted
7、,hardnesstestsamplingofnotlessthan10%,hardness120%,15CrMohardnessofcarbonsteelpipeshallbelessthanbasemetalsteelafterheattreatment,hardnessshouldnotbegreaterthantheparentmaterialof125%.Rateofpipelinenondestructivetestingshallbecarriedoutaccordingtothedesignrequirements,nonodesignrequir
8、ement
