焊接和清洗.焊接外文翻译Word文件下载.docx
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焊接和清洗.焊接外文翻译Word文件下载.docx
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impossibletonameanindustry,
largeorsmall,
thatdoesnotemployistypeofwelding.Industryhasfoundthatwelding
isanefficient,
dependable,
andeconomicalmeansofjoiningmetalinpracticallyallmetalfabricatingoperationsandinmostconstruction.
WhereWeldingIsUsed
Intooling-upforanewmodelautomobile,amanufacturermayspendupwardofamilliondollarsonweldingequipment.
Manybuildings,bridges,andshipsarefabricatedbywelding.Whereconstructionnoisemustbekeptataminimum,suchasinthebuildingofhospitaladditions,thevalueofweldingasthechiefmeansofjoiningsteelsectionsisparticularlysignificant.
Withoutwelding,theaircraftindustrieswouldneverbeabletomeettheenormousdemandsforplanes,rockets,andmissiles.Rapidprogressinthespaceprogram,hasbeenmadepossiblebynewmethodsandknowledgeofweldingmetallurgy.
Probablythemostsizablecontributionweldinghasmadetosocietyisthemanufactureofspecialproductsforhouseholduse.Weldingprocessesareemployedintheconstructionofsuchitemsastelevisionsets,refrigerators,kitchencabinets,dishwashers,andothersimilarproducts.
Asameansoffabrication,weldinghasprovedfast,dependable,andflexible.Itlowersproductioncostsbysimplifyingdesignandeliminatescostlypatternsandmachiningoperations.
Weldingisusedextensivelyforthemanufactureandrepairoffarmequipment,miningandoilmachinery,machinetools,jigsandfixtures,andintheconstructionofboilers,furnaces,andrailwaycars.Withimprovedtechniquesforaddingnewmetaltowornparts,weldinghasalsoresultedineconomyforhighlycompetitiveindustries.
TypesofWeldingProcesses
Ofthemanyprocessesofweldinginusetoday,oxy-fuelgaswelding,arc,andresistancedominatethefield.Theseprocessesarebestexplainedformthestandpointoftheoperator’sduties.
Theskillsrequiredforthisjobareadjustmentoftheregulators,selectionofpropertipsrodmanipulation.Thegasweldermayalsobecalledupontodoflamecuttingwithacuttingattachmentandextraoxygenpressure.Flameoroxygencuttingisemployedtocutvariousmetalstoadesiredsizeorshape,ortoremoveexcessmetalfromcastings.
Thetreemaintypesofarcweldingprocessesusedtodayareshieldedmetal-arcwelding,gastungsten-arcwelding,andgasmetal-arcwelding.Shieldingmetal-arcweldersperformtheirskillbyfirststrikinganarcatthestartingpointofaweldandmaintainingthiselectricarctofusethemetaljoints.Themoltenmetalfromthetipoftheelectrodeisthendepositedinthejoint,togetherwiththemoltenmetaloftheedges,andsolidifiestoformasoundanduniformconnection.Thearcweldingoperatoris
expected
toselecttheproperelectrodesforthejoborbeabletofollowinstructionsasstatedinthejobspecifications,toreadweldingsymbols,andtoweldanytypeofjointusingthetechniquerequired.
Gas-shieldedarcprocesseshavegainedrecognitionasbeingsuperiortothemetalarcprocess.Withgas-shieldedarcboththearcandmoltenpuddlearecoveredbyashieldofinertgas.Theshieldofinertgaspreventsatmosphericcontamination,therebyproducingawelding,sometimescalledTIGandMIG,areeithermanuallyorautomaticallyoperated.
Resistanceweldingoperatorsareresponsibleforthecontrolofmachineswhichfusemetalstogetherbyheatandpressure.Iftwopiecesofmetalareplacedbetweenelectrodesbecauseoftheirownresistance,willbecomeheatedtoaplasticstate.Tocompletetheweld,thecurrentis
interrupted
beforepressureisreleased,therebyallowingtheweldmetaltocoolforsolidstrength.
Theoperator’sdutyistoproperlyadjustthemachinecurrent,pressure,andfeedsettingssuitableforthematerialtobewelded.Thewelderusuallywillberesponsibleforthealignmentofpartstobeassembledandforcontrollingthepassageofpartsthroughtheweldingmachine.
SelectionoftheProperWeldingProcess
Therearenohardandfastruleswhichgovernthetypeofweldingthatistobeusedforaparticularjob.Ingeneral,thecontrollingfactorsarekindofmetalstobejoined,costsinvolved,natureofproductstobefabricated,andproductiontechniques.Someweldingjobsarebestcompletedusingtheoxyfuelweldingprocessascomparedtoshieldedmetalarcweldingprocess.
Oxyacetylenewelding,themostpopularoxy-fuelgasweldingprocess,isusedinallmetalworkingindustriesandinthefieldaswellasforplantmaintenance.Becauseofitsflexibilityandmobility,itiswidelyusedinmaintenanceandrepairwork.Theweldingunitcanbemovedonatwo-wheeledcartor
transported
bytrucktoanyfieldjobwherebreakdownsoccur
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