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1、摘要不銹鋼自1912年發(fā)明以來取得迅猛發(fā)展，至今全球仍以每年3%～5%的速度遞增。我國正處于不銹鋼生產(chǎn)和應(yīng)用的高速增長期，2001年我國不銹鋼的使用量已躍居世界第一。不銹鋼通常含有Cr(WCr≥12%)、Ni、Mn、MO等元素，具有優(yōu)異的耐蝕性能以及特有的力學(xué)性能、物理性能和工藝性能使其適于制造要求耐腐蝕、抗氧化、耐高溫和超低溫的零部件設(shè)備，故而不銹鋼具有廣泛的應(yīng)用前景，其焊接具有特殊性。不銹鋼在電阻點(diǎn)焊過程中極易產(chǎn)生飛濺，焊接接頭處易出現(xiàn)結(jié)合面斷裂，將直接影響焊接接頭的質(zhì)量。本文針對上述問題，研究了304不銹鋼電阻點(diǎn)焊接頭的組織結(jié)構(gòu)特點(diǎn)，分析了焊接電流、焊
2、接時(shí)間、電極壓力以及焊接過程中對電阻點(diǎn)焊接頭組織和性能的影響。實(shí)驗(yàn)表明：當(dāng)焊接電流為6000A，電極壓力為4000N，焊接時(shí)間為7個(gè)周波時(shí)焊點(diǎn)性能最好。接頭的主要結(jié)晶形態(tài)為柱狀晶，其結(jié)合面為點(diǎn)焊接頭的薄弱區(qū)域。不銹鋼點(diǎn)焊接頭易出現(xiàn)裂紋及縮孔等焊接缺陷，使點(diǎn)焊接頭質(zhì)量降低。關(guān)鍵詞:304不銹鋼,電阻點(diǎn)焊,微觀組織,力學(xué)性能2AbstractStainlesssteel?hasbeendevelopedrapidly?sinceitsinventionin1912,?sofartheworldstill?withannual3%?to5%annually.?Ou
3、rcountryisintherapid?growthof?productionandapplicationof?stainlesssteel,?2001usage?ofstainlesssteelinChina?hasbeenrankedfirstintheworld.?Stainlesssteelis?referredtoasthe?corrosionandheatresistantalloysteel.?SousuallycontainCr(WCr≥12%),Ni,Mn,Moandotherelements,withexcellentcorrosion
4、resistanceandmechanicalproperties,uniquephysicalpropertiesandprocessingpropertiesmakeitsuitableformanufacturingrequirementsofcorrosionresistance,hightemperatureresistanceandpartsofequipmentofultralowtemperature,andsohasthewidespreadapplicationprospect,theweldingwithspecial.Stainles
5、ssteelintheprocessofresistancespoteasilytohaveraineddown,weldingjointswithfaceeasyappearrupture,willdirectlyaffectthequalityoftheweldingjoint.Thisisarticleinviewoftheaboveproblems,304stainlesssteelresistancespotjointoftheorganizationalstructurecharacteristics,analyzedtheweldingcurr
6、ent,weldingtime,electrodepressureandweldingprocessofresistancespotjointorganizationandperformanceinfluence.Theexperimentshowedthatwhenweldingcurrentforweldingcurrent6000A,electrodepressurefor4000N,weldingtimefor7cycsolderjointperformanceisthebest.Themaincrystallineformjointiscolumn
7、arcrystals,whichcombinedsurfaceareafortheweakspotweldingjoints.Stainlesssteelweldingjointspronetocracksandwelddefectssuchasshrinkage,sothatthequalityofweldingjointsisreduced.Keywords：304stainlesssteel,Resistancespotwelding,Microstructure,Mechanicalproperties2目錄摘要I1緒論11.1選題背景及意義11.2
8、電阻點(diǎn)焊技術(shù)及當(dāng)前發(fā)展?fàn)顩r11.3不銹鋼的概述61.
