简介:AccordingtospecificationsforWeldingProcedureQualificationofASMEIXSectionandChinesecode,JB4708-2000,asoftwarepackageformanagingweldingdocumentshasbeenrebuilt.Consequently,thenewsoftwarepackagecanbeusedinaLimitedAreaNetwork(LAN)with4differentlevelsofauthoritiesfordifferentusers.Therefore,theweldingdocuments,includingDWPS(DesignforWeldingProcedureSpecifications),PQRs(ProcedureQualificationRecords)andWPS(WeldingProcedureSpecifications)canbesharedwithinacompany.Atthesametime,thesystemprovidesusersvariousfunctionssuchasbrowsing,copying,editing,searchingandprintingrecords,andhelpsuserstomakedecisionofwhetheranewPQRtestisnecessaryornotaccordingtothecodesaboveaswell.Furthermore,superuserscanalsobrowsethehistoryofrecordmodificationandretrievetherecordswhenneeded.
简介:Comparisonsofparticle'sthermalbehaviorbetweenFe-basealloyandboroncarbideinplasmatransferred-arc(PTA)spacewasmadebasedontheoreticalevaluationresultsinthisarticle.ItwasfoundthatmostoftheFebaseparticleswouldbefullymeltedwhiletheytransportingthroughthecentralplasmafieldwith200Asurfacingcurrents.Andtheparticleswithadiameterlessthan0.5×10-4mmightbefullyevaporated.However,fortheboroncarbide(B4C)particles,onlytheonewithadiameterlessthan0.5×10-4mcouldbemeltedinthesamePTAspace.MostofB4CparticlesareonlypreheatedatitssolidstatewhentheywerefedthroughthecentralfieldofPTAplasmawhenthesurfacingcurrentisequaltoorlessthan200A.Whenthearccurrentwassmallerthan100A,onlytheparticlessmallerthan0.5×10-4mcouldbemeltedinthePTAspacefortheFe-basealloy.AlmostnoneofthediscussedB4Cparticlescouldbemeltedinthe100APTAspace.
简介:Anaxisymmetricfiniteelementmodelisdevelopedtosimulatethetemperaturefieldofresistantspotweldingaccordingtotheprocesscharactersofnuggetformationofnon-equalstainlesssteelsheets.Asimulationmethodoftheinteractionofelectricalandthermalfactorsispresented.Thespotweldingprocessofnuggetformationissimulatedusinghardandsoftweldingtechniquenorms.Theheatingcharactersofsoftandhardnormsdeterminethedifferencesintheprocessofnuggetformationanddeterminethefinallyshapeandoffsetofnugget.Experimentalverificationshowsthatthemodelpredictionagreeswellwiththepractical.
简介:ThefrictionandwearbehaviorofFe-Alintermetallicsbasedcoatingproducedbyhighvelocityarcsprayingtechniqueunderdryslidingatroomtemperaturewereinvestigatedusingaball-on-disctribotester.Theeffectofslidingspeedonfrictioncoefficientandwearofthecoatingwasstudied.Thewornsurfaceofthecoatingwasanalyzedbyscanningelectronmicroscope(SEM)toexploreslidingfrictionandwearmechanism.Theresultsshowthatthevariationsoffrictioncoefficientcanbedividedintothreedistinctstepsduringthetrail.Boththefrictioncoefficientandthewearofthecoatingincreasewithincreasedslidingspeedduetoacceleratedcrackpropagationrateandlamellarstructurewithpoorductilityofthecoating.Thecoatingsurfaceissubjectedtoalternatelytensilestressandcompressionstressduringslidingwearprocess,andthepredominantwearmechanismofthecoatingsappearstobebrittlefractureanddelamination.
简介:国际机器人联合会近期公布的数据显示,受到最大买家中国的需求增长大幅放缓影响,201512年全球工业机器人销量增速跌至%。这还不到2014年29%的增速的一半,但高于该机构此前估计的8%的增速。从各国行业协会得到更多数据后,该联合会上修了这一数字。中国国内机器人销量增速从56%降至17%。不过,由于工资上涨使该国渴望实现生产自动化且其机器人与工人之比率仍较低,中国仍占
简介:全自动U肋内焊生产线简介:工作原理:将焊接机器人送入U肋内部,进行内部角焊缝焊接施工作业,同时对整个焊接过程进行在线监控,焊接完成后,还可使用相控阵或磁粉探伤技术对焊缝进行无损检验,可以同时操控12把焊枪,最多可对6根U肋进行焊接。
简介:本文介绍了低温(-50℃)乙烯球罐制造和焊接技术,制定了球罐制造工艺流程和球壳板成形工艺,通过试验确定了焊接预热温度、层间温度和后热温度,并正确选择了焊接材料。制定了乙烯球罐的焊接工艺规范,并成功地完成了低温(-50℃)乙烯球罐的制造和焊接。