外文翻译--结构钢的焊接性

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1、传琶胀筠蹩睛链期稍螗附录1樱放袱俱坩蕹桩呶贞涪英文原文剑萦嘤湖岸蹙讼哕鄙鹤Lecture2.6:WeldabilityofStructuralSteels颤圃裳眉故灰奄貊乱蔑Thelecturebrieflydiscussesthebasicsoftheweldingprocessandthenexaminesthefactorsgoverningtheweldabilityofstructuralsteels.螗斧窦蚴膦瘿士双氵沁SUMMARY少缀褐嫌毕仓鏖拖耿甓Thefundamentalaspectsoftheweldingprocessarediscuss

2、ed.Thelecturethenfocusesonthemetallurgicalparametersaffectingtheweldabilityofstructuralsteels.Asteelisconsideredtoexhibitgoodweldabilityifjointsinthesteelpossessadequatestrengthandtoughnessinservice.囊吹了陋卜朵岿猊谯傈Solidificationcracking,heataffectedzone-liquationcracking,hydrogen-inducedcr

3、acking,lamellartearing,andre-heatcrackingaredescribed.Theseeffectsaredetrimentaltotheperformanceofweldedjoints.Measuresrequiredtoavoidthemareexamined.萍锟嗨鳜田咬锑偷物斡1.INTRODUCTION栏猗炱蛲袢疹劈勇朔壅1.1ABriefDescriptionoftheWeldingProcess囚椹乃箔耖卢股鼠筇朔Weldingisajoiningprocessinwhichjointproductioncanbea

4、chievedwiththeuseofhightemperatures,highpressuresorboth.Inthislecture,onlytheuseofhightemperaturestoproduceajointisdiscussedsincethisis,byfar,themostcommonmethodofweldingstructuralsteels.Itisessentiallyaprocessinwhichanintenseheatsourceisappliedtothesurfacestobejoinedtoachievelocalmel

5、ting.Itiscommonforfurther"fillermetal"tobeaddedtothemoltenweldpooltobridgethegapbetweenthesurfacesandtoproducetherequiredweldshapeanddimensionsoncooling.Themostcommonweldingprocessesforstructuralsteelworkuseanelectricarcmaintainedbetweenthefillermetalrodandtheworkpiecetoprovidetheinte

6、nseheatsource.耀丢砻蛄纯轶醵槐蚁影Ifunprotected,themoltenmetalintheweldpoolcanreadilyabsorboxygenandnitrogenfromtheatmosphere.Thisabsorptionwouldleadtoporosityandbrittlenessinthesolidifiedweldmetal.Thetechniquesusedtoavoidgasabsorptionintheweldpoolvaryaccordingtotheweldingprocess.Themainwelding

7、processesusedtojoinstructuralsteelsareconsideredinmoredetailbelow.骟舰纷横囝呋胳毫底娄1.2TheMainWeldingProcesses秦醴湍锞绲呋婿药本钦a.ManualMetalArcwelding(MMA)耶创崖疬耔绲扮摇撵峭Inthisprocess,thewelderusesametalstickelectrodewithafusiblemineralcoating,inaholderconnectedtoanelectricalsupply.Anarcisstruckbetweenth

8、eelec