焊接技术与工程专业英语PPT格式课件下载.ppt
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焊接技术与工程专业英语PPT格式课件下载.ppt
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AccesstoWeldingLiteraturePart:
WeldingPowerPart:
WeldingMetallurgyPart:
WeldingProcessesWeldingisamaterialsjoiningprocessusedinmakingwelds.Aweldis“alocalizedcoalescence(thegrowingtogetherofthegrainstructureofthematerialsbeingwelded)ofmetalsornonmetalsproducedeitherbyheatingthematerialstosuitabletemperatures,withorwithouttheapplicationofpressure,andwithorwithouttheuseoffillermaterials”.AmericanWeldingSocietyWELDINGDEFINEDWELDINGDEFINED焊接的概念:
焊接是将两种金属(同质或异质)或非金属通过原子或分子间的结合从而连接成一体WELDINGCLASSIFICATIONWELDINGFUSIONWELDINGPRESSUREWELDINGHISTORYOFWELDINGHISTORYOFWELDINGHISTORYOFWELDINGHISTORYOFWELDINGArcweldingHISTORYOFWELDINGRobotweldingHISTORYOFWELDINGLaserweldingHISTORYOFWELDINGSpotweldingHISTORYOFWELDINGFrictionStirwelding1.WHATISWELDINGuMoleculeuOxidationuContaminationuMetallurgyuFusionprocessuPressureprocessKeywords:
2.HEATTREATMENTOFSTEELuHeattreatmentuHardeninguTemperinguAnnealinguQuenchuBrineKeywords:
Under-agedandPeak-agedHeatTreatmenton7075AlAlloyOnestepagingcondition:
Material:
7075Solutiontreatment:
475CX2hQuenchingmedia:
waterAgingconditionafterquenching:
120C*Standard:
AMS2772E-2008Over-agedHeatTreatmenton7075AlAlloyTowstepagingcondition:
107Cfor6handthen163C*Standard:
AMS2772E-2008SummaryonHeatTreatmentof7075AlAlloySolutionTreatmentQuenchingAgingHardnessHVUnder-agedT6475CX2hWater120CX2.5h136Peak-agedT651475CX2hWater120CX24h177Over-agedT7351475CX2hWater107CX6h163CX40h136Kellersetch:
15sLSTMicrostructuralCharacterizationof7075-T651S-TL-T3.THESELECTIONOFMETALSINWELDINGuAlloyuWeldabilityuStrengthuHardnessuStiffnessuDuctilityuNickeluBerylliumuAluminumuIronuSteelKeywords:
TheselectionofMetalsinWeldingMostoftheseventy-fiveorsometalsinnatureareusedinindustry,andaboutonethirdofthemetalsareofinterestinwelding.Ausecanalwaysbefoundfortheparticularcombinationofpropertiesrepresentedbyanymetals.Besides,therangeofavailablemetalshasbeengreatlyextendedbyalloying,andthereisnolimittothenumberofalloyspossibletobedeveloped.Fromtheonemetaliron,probablymorethan25000alloysofsteelarefoundtohavebeendeveloped,althoughtheusesofpureironareveryfewincontrasttothevastrangeofpurposesservedbythemanysteelalloys.TheselectionofMetalsinWeldingMostoftheseventy-fiveorsometalsinnatureareusedinindustry,andaboutonethirdofthemetalsareofinterestinwelding.Ausecanalwaysbefoundfortheparticularcombinationofpropertiesrepresentedbyanymetals.Besides,therangeofavailablemetalshasbeengreatlyextendedbyalloying,andthereisnolimittothenumberofalloyspossibletobedeveloped.Fromtheonemetaliron,probablymorethan25000alloysofsteelarefoundtohavebeendeveloped,althoughtheusesofpureironareveryfewincontrasttothevastrangeofpurposesservedbythemanysteelalloys.自然界中75种左右的金属中,大多数都能应用于工业,其中大概三分之一为焊接所感兴趣。
任何金属性能的特定组合总是能找到其用途。
除此以外,可用金属的范围通过合金化可以得到大大的延伸,并且理论上可以开发无限种类的合金。
以金属铁为例,已经开发出了25000多种钢,然而与钢得到大规模的应用相比,纯铁反而应用很少。
Thebasiccharacteristicsthatmakethemetalssoveryusefularetheirweldability,hardness,stiffness,andductility(thatisthepropertytobeshapedeasily).Thesecharacteristicsofmetalsareofgreatimportancetoawelder.Ifhehassomeknowledgeofthem,heiscertaintohavehisweldingjobsdoneinaproperways.金属能够得到广泛应用的基本前提就是其焊接性、硬度、韧性及塑性(指其易加工性能)。
金属的这些性能对焊工非常重要。
只有在知道这些性能的前提下,他才能实现正确的焊接操作。
TheselectionofMetalsinWeldingThereisnosuchthingasanidealmetal,althoughnickelmaybeconsideredtohavecomeclosest.Foraparticularapplication,thebestselectionisthemetalthathasthemostfavorablefeatures.Probablythetwomostimportantcharacteristicstobeconsideredarecostandweight.Weightparticularlyhasbeenpaidgreaterattentiontoinrecentyearsowingtothedevelopmentofmodernindustries.Itisforthispurposethataluminumandberylliumareusedtomakeaircraftsandrockets.工业上没有纯完美的金属,虽然镍被认为是最接近完美的一种金属。
对于特定用途,具有相匹配性能的金属为最佳选择。
这中间需要考虑的两个重要因素就是价格和重量。
近年来由于现代工业的发展,重量方面得到更多的关注。
基于此原因,铝和铍广泛用于航空和火箭上。
TheselectionofMetalsinWeldingCostmustbebalancedagainstothercharacteristicsofthemetals.Forexample,itispossibletoreplaceberylliumbymetalsofonlyahundredththecost,butsuchsubstitutescannotmatchberylliumsstiffnessandstrength,andtheindustriesconcernedmaydecidethatthesuperiorityofberylliumwarrantstheincreasedcost.Forotherapplications,however,berylliumisnotinsuchafavor,andthereforeisnotconsideredasametaltoberequired.在考虑金属性能的基础上必需考虑金属的价格。
比如,虽然能够用价格只有铍金属价格的金属来代替铍,但这些金属还是不能达到铍的韧性及强度,相关行业认为金属铍的优先使用,导致铍的价格不断上涨。
然而对于其它行业,铍并不是最佳选择,从而也不会考虑为一种必需的金属。
TheselectionofMetalsinWelding4ExpansioninWelding4ExpansioninWeldinguExpansionuContractionuDistortionuInternalstainsuCoefficientoflinearexpansionKeywords:
文献的结构Title(标题)Authors(通讯作者)FirstauthorCorrespondingauthorAddress(通讯作者单位)Abstract(文章摘要)Keywords(关键词)Introduction(引言)Experiments(试验)Results(结果分析)Conclusions(结论)Acknowledgement(致谢)References(参考文献)专业文献的阅读Title:
反映了文章的中心思想,一句话Authors:
反
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