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1、外文原文：Weldingistoensurethattheshipoftheshipandthestrengthofthekey.Thispaperdescribestheshipintheweldingofseveralcommonreasonsfortheshortcomingsandproposepreventivemeasures.Weldingistoensurethattheshipoftheshipandthestrengthofthekeyistoensurethatthekeytothequalityofth
2、eship,istoensurethesafetyofshipsnavigatingamdoperatinganimportantconditionfor.IfthereisaweldingdefecitmaycausestrueturalfauIts,leakage,orevencauseth巳shipsank.Accordingtotheshipbrittlefractureaccidentinvestigationshowedthat40percentofbrittlefracturefromtheaccidentwas
3、thebeginningofthewelddefects.Shipsinthetownshipinshipbuilding,shiptheweldingqualityisparticularlyprominent.Intheinspectionofshipsintheprocessofweldingthetestisparticularlyimportarit.Therefore,shouldth巳earlydetectionofdefects,theweldingdefectsrestrictedtoacertainexte
4、nt,toensurenavigationalsafety.Manytypesofshipweldingdefects,accordingtotheirdifferentpositions,thedefectscanbedividedintoexternalandinternaldefects.Defectshavepores,slag,weldingcracks,lackofpenetration,notfusion,weldandshapeofDimensionarenotmet,thebitingedge,ofweldi
5、ng,suchasarcpit.firststomataiporestomalalporemeansthatthewelding,bubblebathinthesolidificationofthefailedescapetheholeformed.Themainreasontherehavestomata:grooveedgeofdirty,water,oilandXiuji;electrodeornotprovisionsofcuringflux,solderorrust-coreskindegenereition,suc
6、hasspalling.Inaddition,low-hydrogenweldingelectrode,thearcistoolong，weldingtoofast;submergedarcweldingvoltagetoohigh,areeasilygeneratedintheprocessofweldingstomata.Becausethepreseneeofporositysothattheseamofeffectivecross sectiondecreased,toolargeporeswillreducethes
7、trengthofwelds,thedestructionoftheweldmetaldensity.Preventionistohaveastoma:choosetherightweldingcurrentAndweldingspeedandgrooveedgetocleanupWater,oilandXiuji.Strictlyinaccordanc巳withtheregulationscustody,clearingandcuringweldingmaterials.Nottousedegenerateelectrode
8、,whentheskindegenerationdrugdiscoveryelectrode,spallingorweldingcorecorrosion,shouldstrictlycontroltheuseof.SAW,shouldusetheappropriatcwel
