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1、金属焊接与切割复审考试复习题（Reviewofmetalweldingandcuttingexamination）[welding]reviewofmetalweldingandcuttingexaminationFirst,themultiple-choicequestion1,inthematerial,anyatomsinthestateofrandomaccumulation,knownasnoncrystal.(ofcrystals,crystals,noncrystals)2,the
2、heatingofsteelorsteelpartstoA3orabove50--70,Acmdegrees,aftertheappropriatetimetowarm,theprocessofcoolinginthestillairiscallednormalizing.3,cuttingprocessispreheated--metalmaterialcombustion-blowingprocess.(combustionprocess,meltingprocess,gasificatio
3、nprocess)4,carbonsteelcutting,shouldadoptaneutralflame.(carbonneutralflameflame.)5.Carbonizationflamesuitableforweldingcastiron.(lowcarbonsteel,mediumcarbonsteel,castiron,HuangGang)Thecombustiongasfor6,gasfortheoxygen(hydrogenandoxygenacetylenegas)7,
4、thecommoncombustiblegasacetylenegaswelding.(oxygenacetylene)8,flammableandexplosivesubstancesbelongingtoacetylene.(acetylene,carbondioxide)9,acetyleneuse,themaximumworkpressureisprohibitedmorethan150KPa(150Kpa,100Kpa,240Kpa)Atfirstglance,explosionlim
5、itof10acetyleneandairmixersfor2.2--81(2.2--61%%%%%%%15--282.2--81)11,thecalciumcarbideignition,explosionriskisrelatedtothedecompositionrate,thesmallertheparticlesizeofcalciumcarbide,thefasterthedecompositionrateofcalciumcarbide.(slow,fast)12,theweldi
6、ngelectrodeweldingequipmentno-loadvoltageisgenerally50-90V(50-90V,30-45V,40-80V)13,oxygenbelongstocompressed***,acetylenebottlebelongstodissolve***.14.Theshelloftheacetylenepressurereducerispaintedwhite.(skyblue,green,white)15,oxygensurface,paintedbl
7、ue.(blue,white,skyblue,gray)16,acetylenedissolvedinacetoneliquid,toitsdecomposition,explosionreduction.(reduce,increase)17,theoxygeninthegasmaynotbeusedup,thereshouldberetained0.1MPaexcesspressure.(0.20-0.30Mpa0.10-0.20Mpa1-2Mpa)18,openthesuctiontorc
8、hweldingoxygenvalve,throughoxygen,withoutacetylenebelt,opentheacetylenevalve,acetyleneentranceshouldhavesuction(blowforcesuction)19,whenthefirstignitionoxygenvalveafterthevalveopenacetyleneajar.20.Thefunctionofthereduceristoreducepressure,regulatevol
