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1、电焊工技师、高级技师理论考试题目（Weldertechnicianandseniortechnicianintheoryexam）WeldertechnicianandseniortechnicianintheoryexamAbriefanswer:1.Howmanykindsofweldmarkingmethodsarethere?Whatarethey?Answer:therearetwokinds:Dimensioninganddiagramming2,heattreatmentofsteelca
2、nberoughlydividedintothosebasictypesAnswer:theheattreatmentofsteelisdividedinto1,commonheattreatment(annealing,normalizing,quenchingandtempering)2surfaceheattreatment(1)surfacequenching(2)chemicalheattreatment(carburizing,nitriding,carbonitriding)3,accor
3、dingtotherelevantsafetytechnicalstandards,whatarethesafetyvoltagesforaspecificoperatingenvironment?Answer:1,forrelativelydryandelectricshockdangerousenvironment,thesafetyvoltageis36V.2,fordampandelectricshock,dangerousenvironment,thesafetyvoltageis12V.3,
4、forunderwaterorotherelectricshockcausedbyserioustwoaccidentenvironment,thesafetyvoltageis3V,Thestandardalsospecifiesthesafevoltageisnotusedautotransformerforportableworklamporcontrolbutton,becausetheautotransformeroutputvoltageandlowvoltagenetworkarenoti
5、solated,sothereisnosecurity.4,whataretheadvantagesoffluxcoredwire?Answer:1,weldingprocessperformanceisgood.2,depositionfast,highproductionefficiency.3,alloysystemadjustment,theapplicabilityofsteel,4,lowenergyconsumption,5,comprehensivecostislow,5,commerc
6、iallyavailableCO2gas,suchashighwatercontent,whatmeasurescanbetakentoreducemoisture?Answer:1,thenewgasbottleupsidedownfor2hours,Openthevalve,drainthewaterwhichisdepositedinthelowerpart,andpourthegascylinderdownafterthewaterisfinished.2.Useairfor2-3minutes
7、beforeusebecausetheupperairusuallycontainsmoreairandwater.3.HighpressuredryersandlowpressuredryersareinstalledinthegaspathtofurtherreducemoistureintheCo2.Generallyusesilicagelordehydratedcoppersulfateasdesiccant,canberepeateddrying,afterrepeateduseofwate
8、r.4,whenthegaspressureinthecylinderfallsbelow0.98MPa,nolongeruse.Atthispoint,whentheliquidCo2hasevaporated,thegaspressuredecreaseswiththegasconsumption,therelativepressureofwaterincreases,andthevolatilecontentincreases.Ifc
