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1、學(xué)兔兔www.xuetutu.com第47卷第8期機(jī)械工程學(xué)報VO1．47NO．82011年4月JOURNALOFMECHANICALENGINEERINGApr．2011Dol：lO．3901／JME．2011．08．083超細(xì)顆粒焊劑約束電弧用于超窄間隙的焊接冰鄭韶先李德福朱亮2王順花(1．蘭州t交通大學(xué)機(jī)電工程學(xué)院蘭州730070；2．蘭州理工大學(xué)甘肅省有色金屬新材料省部共建國家重點實驗室蘭州730050摘要：為實現(xiàn)電弧約束良好、焊接過程穩(wěn)定靠的超窄間隙焊接，基于窄間隙埋弧焊的眾多優(yōu)點和對超窄問隙中的屯弧進(jìn)行約束以防l卜電弧攀殲的思路，提出采用超細(xì)顆粒焊劑約束電弧以實現(xiàn)超窄間隙焊接的方
2、法，研制々用的焊槍，開發(fā)出采用v彤金屬絲網(wǎng)襯墊焊劑顆粒的超窄問隙焊接工藝。結(jié)果表明，超細(xì)顆粒焊劑熔化后形成的熔渣擘可對電弧進(jìn)行有效約束，實現(xiàn)穩(wěn)定可靠的超窄問隙電弧僻。隨著焊劑顆粒尺寸的減小，焊劑松裝密度的增加使得彤成凸焊縫的傾向增加。采v形金慝絲襯墊焊劑顆粒的藝進(jìn)行超窄間隙焊接，可以顯著增強(qiáng)電弧對側(cè)壁根部的加熱效果，獲得足夠的側(cè)壁根部熔透深度，從保證了超窄間隙焊縫的熔合質(zhì)量。關(guān)鍵詞：超細(xì)顆粒焊劑受約束電弧超窄間隙焊接中圖分類號：TG444+．7ConstrictedArcbyUltra—fineGranularFluxAppliedtoUltra-narrowGapWeldingZHENGS
3、haoxianLIDefuZHULiangWANGShunhua(1．SchoolofMech—ElectronicTechnology,LanzhouJiaotongUniversity，Lanzhou730070；2．StateKeyLaboratoryofGansuAdvancedNon—ferrousMetalMaterials，LanzhouUniversityofTechnology，Lanzhou730050)Abstract：Inordertomaketheultra—na~owgapweldinghaveawellconstrictedarcandastableandrel
4、iableweldingprocess，basedonthenumerousadvantagesofnarrowgapsubmergedarcweldingandthethoughtofconstrictingthearcinthena~owgapSOastopreventitfromclimbingup，themethodofconstrictedarcbyultra—finegranularfluxappliedtoultra—narowgapweldingisbroughtforward，specialweldingtorchandthetechnologyofunderlayingu
5、ltra—finegranularfluxwithVtypeofmetalmesharedeveloped．Theresultsindicatethatthemoltenslagwallformedbythemoltenultra—finegranularfluxcanefectivelyconstrictthearc，thusrealizingstableandreliableultra—narrowgapwelding．Withthedecreaseofparticlesizesofultra—finegranularflux，thetendencyofformingconvexweld
6、isenhancedduetotheincreaseofthebulkdensityofweldingflux．Thetechnologyofunderlayingultra—finegranularfluxwithVtypeofmetalmeshcanobviouslyimprovetheheatingefectofarcontherootsofsidewalls，andobtainenou曲penetrationattherootsofsidewalls，whichcanensurethefusionqualityofultra—narrowgapweldKeywords：Ultra—f
7、inegranularfluxConstrictedarcUltra—narrowgapwelding接方面，超窄間隙焊接技術(shù)對于解決因焊接熱輸入0前言過大所導(dǎo)致的焊縫熱影響區(qū)晶粒粗化問題具有明顯的優(yōu)勢【J之j。研究還表明，超窄間隙焊接技術(shù)用于奧作為?種高效、低成本、極低線能量的厚壁【氏體不銹鋼焊接可明顯降低焊縫內(nèi)部的顯微偏析、件焊接技術(shù)，超窄間隙電弧焊已經(jīng)越來越多的引起抑制晶界處鉻的碳化物析出，而可著提高奧
