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1、第34卷第12期中國(guó)激光Vol.34,No.122007年12月CHINESEJOURNALOFLASERSDecember,2007文章編號(hào):02587025(2007)12172606CO2激光焊接車身拼焊板1,22322伍強(qiáng),陳根余,徐蘭英,龔金科,李力鈞1廣東技術(shù)師范學(xué)院機(jī)電系,廣東廣州5106352湖南大學(xué)汽車車身先進(jìn)設(shè)計(jì)制造國(guó)家重點(diǎn)實(shí)驗(yàn)室,湖南長(zhǎng)沙4100823華南理工大學(xué)機(jī)械工程學(xué)院,廣東廣州510640摘要利用CO2激光對(duì)汽車車身拼焊板進(jìn)行了焊接實(shí)驗(yàn),并對(duì)焊縫進(jìn)行了
2、顯微組織分析和機(jī)械性能分析。采用Ar氣作為焊接保護(hù)氣體,能獲得比采用N2氣時(shí)更好的深沖性能;側(cè)吹保護(hù)氣體的方法能有效地控制焊縫中的鋅含量。研究了焊接熔深和焊縫寬度隨激光功率和焊接速度變化的規(guī)律。實(shí)驗(yàn)結(jié)果表明,在優(yōu)化的工藝參數(shù)下,激光焊接車身拼焊板的焊縫中沒(méi)有出現(xiàn)氣孔、裂紋和熱影響區(qū)(HAZ)軟化等缺陷,拼焊板的深沖性能優(yōu)良;拼焊板的成形性能取決于兩種材料的強(qiáng)度比和厚度比,焊縫易于向高強(qiáng)度鍍鋅鋼板一側(cè)偏移;普通鋼板越薄,焊縫的偏移量越大。關(guān)鍵詞激光技術(shù);激光焊接;薄鋼板;焊接工藝;鋅行為中圖分類號(hào)TG45
3、6.7文獻(xiàn)標(biāo)識(shí)碼ACO2LaserWeldingofVehicleBody1,22322WUQiang,CHENGenyu,XULanying,GONGJinke,LILijun1DepartmentofMechanicalandElectricalEngineering,GuangdongPolytechnicNormalUniversity,Guangzhou,Guangdong510635,China2StateKeyLaboratoryofAdvancedDesignandManuf
4、actureforVehicleBody,HunanUniversity,Changsha,Hunan410082,China3CollegeofMechanicalEngineering,SouthChinaUniversityofTechnology,Guangzhou,Guangdong510640,ChinaAbstractBasedonexperimentsofCO2laserweldingtovehiclebody,jointmicrostructureandmechanicalpropert
5、yofspecimenareanalyzed.ThedeeppunchingperformanceoflaserweldingadoptingArasprotectivegasisbetterthanthatacquiredbyadoptingN2.Meanwhilethepercentageofzincinweldingseamcanbeeffectivelycontrolledbythesideprotectivegasblowing.Weldingdepthandwidthvaryingwithlas
6、erpowerandspeedofweldingwerealsoinvestigated.Theresultindicatesthatitdoesnotappearsomeflaws,suchasgashole,crackandsofteningofheataffectzone(HAZ)inlaserweldingseamoftailorweldedblanksthroughoptimizingtechnologyparameters.Thedeeppunchingperformanceoftailor
7、weldedblanksisofveryhighquality.Formingpropertyoftailorweldedboarddependsonstrengthratioandthicknessratiooftwomaterials,weldinglinemainlylocatesathighstrengthgalvanizedsteelsheet,theoffsetofweldinglinetendstowardthingeneralsteel.Keywordslasertechnique;la
8、serwelding;sheetsteel;weldingtechnology;effectsofzincevaporation1引言材料。拼焊已經(jīng)成為汽車車身的成形新技術(shù),它可以不受限制地把不同厚度、不同材質(zhì)、不同強(qiáng)度、不近年來(lái),安全、減重和環(huán)保作為汽車產(chǎn)業(yè)的重要同沖壓性能和不同表面狀況的散板坯拼焊在一起,問(wèn)題已越來(lái)越受到人們的重視。在不增加成本,維用來(lái)壓制成大型覆蓋件。采用這種拼焊板坯既可設(shè)持車身功能
