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1、武漢科技大學(xué)碩士學(xué)位論文點(diǎn)焊電極表面振動電火花熔敷TiC的研究姓名：程長坤申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：董仕節(jié);陳貽宏20040510武漢科技大學(xué)碩士學(xué)位論文第1頁摘要由于點(diǎn)焊電極點(diǎn)焊鍍層鋼板的壽命比點(diǎn)焊非鍍層鋼板的壽命短，隨著鍍鋅鋼板在汽車構(gòu)件中應(yīng)用的日益增加，電極的耗量也增加，所以提高點(diǎn)焊電極壽命的研究具有重要的意義。本文研制了Rc型點(diǎn)焊電極表面電火花振動熔敷裝置，并通過正交實(shí)驗(yàn)研究了點(diǎn)焊電極表面電火花振動熔敷TiC涂層的工藝，利用x射線衍射技術(shù)、掃描電子顯微鏡研究了未熔敷TiC涂
2、層的電極和熔敷TiC涂層的電極在點(diǎn)焊過程中電極端面結(jié)構(gòu)變化和電極失效機(jī)理。研究結(jié)果表明：點(diǎn)焊電極表面電火花振動熔敷TiC涂層的最佳工藝參數(shù)是電壓為7．5V，電容為6X22000uf，熔敷棒振動頻率為75Hz，電極轉(zhuǎn)速為280r／min。點(diǎn)焊電極在最佳參數(shù)下熔敷120秒，其表面涂層厚度為lO—15um。熔敷TiC涂層的電極的使用壽命可達(dá)到1600點(diǎn)，是未熔敷TiC涂層電極壽命(700點(diǎn))的2．3倍。熔敷TiC涂層提高了電極壽命原因是電極表面熔敷Tic涂層能阻礙電極與鍍鋅板之間的局部焊接以及減緩電極表面的
3、合金化。關(guān)鍵詞：電阻點(diǎn)焊：電火花；TiC涂層：電極；失效機(jī)理第1I頁武漢科技大學(xué)碩士學(xué)位論文Abstract4I。heelectrodeconsumptionhaslncreaseddramaticallywithincreaseofcoatedsteelsheetsapplicationinautomotivefabrication，becausetheelectrode邱lifeisshortenwhencoatedsteelsheetsareresistancespotweldedthanunc
4、oatedones．Therefore，itisofconsiderablesignificationtostudyonprolongelectrodetiplife．TheRCtypedeviceofcoatingonelectrodetipsurfaceusingvibratingelectricsparkinghasbeendevelopedinthisthesis，thecoatingparametersofdepositionofTiConelectrodetipsurfaceofresis
5、tancespotweldingusingvibratingelectricsparkinghasbeenstudiedbyoptimizingexperiments，thestructuraltransformationofelectrodetipsurfaceandthefailuremechanismofelectrodeduringresistanceSpotweldingusinguncoatedelectrodeandcoatedTiCelectrodehavebeeninvestigat
6、edbyX—raydiffractionG(RD)andscanningelectronmicroscopy．TheresultsindicatethatthebestcoatingparametersofdepositionofTiConelectrodetipsurfaceofresistancespotweldingusingvibrmingelectricsparkingareasbelow：theelectricvoltageis7．5v，capacitanceis6X22000¨f，the
7、vibratingfrequencyofthecoatingstickTiCis75HzandtherevolvingspeedoftheRSWelectrodeiS280r／min．TheelectrodeiScoatedfor120secondswiththebestparametersandthethicknessofthedepositionsiS10．15Ixm．ThetiDlifcofthecoatingTiCelectrodesisupto1600welds，andisaS2．3time
8、sasthetiplifeoftheuncoatingonesr700welds)．nedepositionsofTiCextendingtheelectrodelifeisbecausethatthedepositionsofTiClayercandecreaselocalweldingwiththesubstrateandthegalvanizedlayerofthesheetsandslowerthealloyingspeedofelectrode
