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《高強鋁合金的激光填粉焊接》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學術(shù)論文-天天文庫。
1、攘簧摘要高強鋁含金在航空航天、汽車、輟型軌道交通等工業(yè)部門得到了廣泛應用。幽于高強鋁臺金很難用一般的熔焊方式來焊接,用米傲結(jié)構(gòu)件時道常用螺栓、鉚銩來連接,毽這些連接方浚會增熱結(jié)梭蘧量幫璦撩綴濟潰耗。激光裳吳奏穰奩鶼能量密度,所以用激光進行焊接不僅遵腹快,而且變形小,但是激光焊接鋁合俞同樣會遇到~般熔焊方法焊接鋁合金時如現(xiàn)的氣孔、裂紋等缺陷。為了消除這熱缺陷,在激光游接遣程孛鞠入簿絲是一釋菲鬻實震鶼方法,國際主肖關(guān)藏方瑟瓣研究已很深入并開始走向工業(yè)應用。與焊絲相似,禽屬粉末同樣可以作為填充材料,而且更熬柔性化,
2、但有關(guān)此方面的研究極少,本文的主要研究內(nèi)容就是從機淫幫實驗褻方器研究采瘸填充粉末款方式對鍰臺金滋行激競簿揍。為達到遴粉焊接的目的,我們在對現(xiàn)有噴粉頭進行了深入嫩研究分析后,設(shè)計出了一羊中自匯聚同軸三層結(jié)構(gòu)送粉頭。它不僅可以將粉末匯聚到焊接要求的寒徑,溺露魏辯焊縫送行鴦效魂豹保護。經(jīng)實驗謠實,魏送糖頭究全能漾霆送粉焊接的要求。對填粉焊接過程進行的高速攝像和愈相分析表明,焊接過程比未加粉穩(wěn)定,會藩蒸汽露等離子體被套散壓壤,鑊瓣成分為AISil2豹填禿耪叁胃
3、羞:有效慧溪除熱裂紋和氣孔。利用優(yōu)化的焊接工藝參數(shù),我們
4、狂YAG激光器上成功地對7075為主的幾神嵩強鋁臺余媛功建進圣亍了激光填耪渾接,溽縫整齊熒穗,無咬邊、下陷、不連續(xù)等宏觀缺陷。拉伸實驗詆實,7075焊尉的平均拉伸強度為370Mpa,為母材的80%左右。關(guān)鍵詞高強鋁合會;激光焊接:粉米;保護氣建哀王韭大學頸±學蘊論文ABSTRACTHi馥strengthaluminmnalloysaleusedinawiderangeofengineeringapplications,whichincludeaerospace,automobile,lightrailwaye
5、tc,Sincethesealloysarenoteasytoweld,theymustbejoinedbyboltsandrivetswhenassembledasstructures.Suchmechanicaljointsaredisadvantageousforreduceweightandconstructioncost,Laserbeamhasvery蠹l秘powerintensity,thereisanincreasinginterestinapplyinglaserbeamweldingtoa
6、luminumalloyssinceitoffersadvantagessuchashighweldingspeedsandlowdistortion.however,porosityandhotcrackareoftenencounteredinlaserweldingaswellasinconventionalprocesses+Tominimizethisproblem,fillerwirealeusedinIaserwelding,Justlikefillerwire,powdermetalhavet
7、hesameeffect,otherwise,itismoreflexiblethanwireintheweld.Inthispaper,wedosometheoreticalandexperimentalstudyingOnaluminumpowderwelding,Tomeetthespecialtyoflaserpowderwelding,wedesignedathree—plyself-bundlingcoaxialpowderinjectingheadwhichCallbothfeedthepowd
8、ermetalandprovideshieldinggas.Itsfunctionhasbeenapprovedinexperimentsisgood.}{i醴speedcamerashootshowthemovingoftheweldingpoolissteadyanduniforln.Bymetallographicanalyzingoftheweldedseam,theconclusioncarlbemadethatitCanwelleliminatethehotcrackandporositywhen
9、theweldadoptA1Siupowderalloymetal,Adoptingoptimizedprocessingparameterswehavewelded7075aluminumsuccessfullybyinjectingpowderfillermetaltotheweldingpoolwithhighpowerYAGlaser.Bothsidesoftheweldedseamisfu