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1、电焊作业危害因素分析及预防措施（Weldingoperationhazardsanalysisandpreventivemeasures）1weldingoperationhazardsanalysisandpreventivemeasuresHazardousfactorsanalysisandpreventivemeasuresofweldingoperationAlsocalledtheweldingelectricarcwelding,thearcheateffectproducedbyweldingequ
2、ipment,promptedbysectionoflocalheatingandmeltingweldingmetaltoliquid,sothattheoriginalseparationofmetalbindingintojointprocesssolid,nonremovable.Accordingtotheweldingprocess,arcweldingcanbedividedintoautomaticwelding,semi-automaticweldingandmanualwelding.Autom
3、aticweldingandsemi-automaticweldingmainlyusedforlarge-scalemachineryandequipmentmanufacturing,theequipmentinstalledinthefactory,theworkplaceisrelativelyfixed;andmanualweldingduetoworkplaceconditions,withgoodflexibility,currentlyusedforoutdoorconstructionworkmo
4、re.Astheworkplacevariesgreatly,theworkisaccompaniedbyelectricity,light,heatandopenflame,sotherearevarioushazardsinweldingoperation.1.1easytocauseelectricshockaccidentA)intheprocessofwelding,becausetheweldershouldoftenchangetheelectrodeandadjustweldingcurrent,o
5、perationintodirectcontactelectrodeandtheelectrode,andtheweldingpowerisgenerally220V/380V,whentheelectricalsafetyprotectiondevicefailure,laborprotectionproducts,unqualifiedoperatorsillegaloperations,itmaycauseelectricshockaccident.Theriskofelectricshockisgreate
6、rifitisweldedinametalcontainer,onapipeorinahumidplace.B)welderno-load,twowindingvoltagein60~90Vgenerally,becausethevoltageisnothigh,easytobeignoredbythewelders,butitsvoltageexceedstheprescribedsafetyvoltage36V,thereisstillacertainrisk.Assumethattheno-loadvolta
7、geof70Vweldingmachine,peopleworkinginhightemperatureandmoistenvironment,thebodyresistanceofRisabout1600,ifthewelderhandcontactjaws,throughthebodycurrentofI:I=V/R=70/1600=44Ma,inthecurrentundertheactionofthewelderhandspasm,easytocausetheelectricshockaccident.C)
8、formostoftheweldingoperationintheopenair,weldingmachine,weldingwireandpowerlineinhightemperatureandhumidenvironment(constructionsite)anddust,andstovemachineoftenoverloadoperation,e
