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1、傳琶脹筠蹩睛鏈期稍螗附錄1櫻放袱俱坩蕹樁呶貞涪英文原文劍縈嚶湖岸蹙訟噦鄙鶴Lecture2.6:WeldabilityofStructuralSteels顫圃裳眉故灰奄貊亂蔑Thelecturebrieflydiscussesthebasicsoftheweldingprocessandthenexaminesthefactorsgoverningtheweldabilityofstructuralsteels.螗斧竇蚴膦癭士雙氵沁SUMMARY少綴褐嫌畢倉鏖拖耿甓Thefundamentalaspectsoftheweldingprocessarediscuss
2、ed.Thelecturethenfocusesonthemetallurgicalparametersaffectingtheweldabilityofstructuralsteels.Asteelisconsideredtoexhibitgoodweldabilityifjointsinthesteelpossessadequatestrengthandtoughnessinservice.囊吹了陋卜朵巋猊譙傈Solidificationcracking,heataffectedzone-liquationcracking,hydrogen-inducedcr
3、acking,lamellartearing,andre-heatcrackingaredescribed.Theseeffectsaredetrimentaltotheperformanceofweldedjoints.Measuresrequiredtoavoidthemareexamined.萍錕嗨鱖田咬銻偷物斡1.INTRODUCTION欄猗炱蟯袢疹劈勇朔壅1.1ABriefDescriptionoftheWeldingProcess囚椹乃箔耖盧股鼠筇朔Weldingisajoiningprocessinwhichjointproductioncanbea
4、chievedwiththeuseofhightemperatures,highpressuresorboth.Inthislecture,onlytheuseofhightemperaturestoproduceajointisdiscussedsincethisis,byfar,themostcommonmethodofweldingstructuralsteels.Itisessentiallyaprocessinwhichanintenseheatsourceisappliedtothesurfacestobejoinedtoachievelocalmel
5、ting.Itiscommonforfurther"fillermetal"tobeaddedtothemoltenweldpooltobridgethegapbetweenthesurfacesandtoproducetherequiredweldshapeanddimensionsoncooling.Themostcommonweldingprocessesforstructuralsteelworkuseanelectricarcmaintainedbetweenthefillermetalrodandtheworkpiecetoprovidetheinte
6、nseheatsource.耀丟礱蛄純軼醵槐蟻影Ifunprotected,themoltenmetalintheweldpoolcanreadilyabsorboxygenandnitrogenfromtheatmosphere.Thisabsorptionwouldleadtoporosityandbrittlenessinthesolidifiedweldmetal.Thetechniquesusedtoavoidgasabsorptionintheweldpoolvaryaccordingtotheweldingprocess.Themainwelding
7、processesusedtojoinstructuralsteelsareconsideredinmoredetailbelow.騸艦紛橫囝呋胳毫底婁1.2TheMainWeldingProcesses秦醴湍錁緄呋婿藥本欽a.ManualMetalArcwelding(MMA)耶創(chuàng)崖疬耔緄扮搖攆峭Inthisprocess,thewelderusesametalstickelectrodewithafusiblemineralcoating,inaholderconnectedtoanelectricalsupply.Anarcisstruckbetweenth
8、eelec
