简介:Weldshapecontrolisafundamentalissueinautomaticwelding.Inthispaper,adoublesidevisualsystemisestablishedforpulsedgasmetalarcwelding(P-GMAW),andbothtopsideandbacksideweldpoolimagescanbecapturedandstoredcontinuouslyinrealtime.Byanalyzingtheweldshaperegulationwiththemoltenmetalvolume,sometopsideweldpoolcharacterizedparameters(WPCPs)areproposedfordeterminingpenetrationinbuttweldingofthinmildsteel.Moreover,someBPnetworkmodelsareestablishedtopredictbacksideweldpoolwidthwithweldingparametersandWPCPsasinputs.
简介:<正>由于气体保护焊(GMAW)具有低成本、高效率、易于自动化等优点,已经成为金属结构制造中最广泛应用的连接工艺。GMAW在应用中也存在一些问题,焊接飞溅就是其中之一。降低焊接飞溅一直是GMAW技术中备受关注的问题。众所周知,射流过渡模式GMAW的焊接飞溅近乎为零,因此被广泛采用。然而在汽车车身机器零部件等的焊接应用中,一个令人疑惑和困扰的问题是:即使采用射流过渡,实际焊接飞溅量仍然比较大。这是因为焊接过程中有频繁的引弧过程,为此,国外的研究者对改善GMAW引弧过程进行了大量研究。加拿大多伦多大学对GMAW引弧采用高速摄像及同
简介:Roboticgasmetalarcwelding(GMAW)experimentswereconductedusinganERTOS-1electrodewithAr+10%CO_2shieldinggas,andtheweldingcurrentandarcvoltagesignalswerecollectedbyadataacquisitionsystem.TheboundariesbetweenglobulartransferandspraytransferintermsoftheweldingcurrentandarcvoltageweredeterminedaccordingtothewaveformofelectricsignalsandtheFouriertransformresultsofarcvoltage.Theoptimumweldingparametersforthetwotransfermodeswereobtained,whichlaidafoundationforthenumericalsimulationandcontrolofGMAWprocess.
简介:Inthispaper,anumericalinvestigationaboutthemetaltransferofGMAWisinvestigatedbasedonthephasefieldmodel.Bedifferentofmostpublishedwork,wetakethethermocapillaryeffectandmixtureenergyintotheprocessofphasetransferandinterfacechangewhichisdifferentfromvolumeoffluid(VOF)method.Wediscretizethewholemodelwithacontinuousfiniteelementmethodandwealsoapplyapenaltyformulationtothecontinuityconditionenhancingthestabilityofthepressure.MetaltransferofGMAWwithconstantandpulsecurrentiscomputedasnumericalexampleswhichagreeswellwiththedataofhigh-speedphotography.Theresultshowsthatthecomputingprocessofthephasefieldmodelisstabilityandithasahigherprecisioninpredictingthediameterofdroplet.
简介:Asadepositiontechnology,gasmetalarcwelding(GMAW)hasshownnewpromiseforrapidprototypingofmetallicparts.DuringtheprocessofmetalformingusingthearcofGMAW,lowheatinputandstabledroplettransitionarecriticaltohighqualityfiguration.TheeffectsofvariousprocessingparametersonfigurationqualitywerestudiedintheexperimentofGMAWrapidprototypingusingthewireofER50-6,includingweldingvoltage,wirefeedingrate,weldingspeedandsoon.TheoptimalparametersforER50-6areobtained.Simultaneously,itisverifiedthattherapidprototypingpartswithfavorablestructuresandqualitycanbeachievedundertheconditionsoflowheatinputandstabledroplettransition.
简介:为在电极融化和金属期间,转移在Gas-Metal-Arc-Welding(GMAW)过程包含了的电、热的特征的模拟的二维的短暂数字分析和计算模块被介绍。非线性的短暂的热转移方程的答案用控制卷被执行有限差别技术。计算模块也包括控制并且工业焊接的规定算法驱动来源。模拟结果是电流和电压波形,在电路的不同部分的吝啬的电压落下,全部的电力,阴极,阳极和弧力量和弧长度。我们与U/I和I/I-modulation模式为正常过程(经常的电压)并且为搏动的进程描述模型的申请。有电流和电压的试验性的波形的比较证明模型与高精确性预言电流,电压和电力。模型为热流动的计算在模拟包裹SimWeld被使用进细工品和焊接缝接形成。从计算的热流动和焊接水池尺寸,相等的容量的热来源能根据Goldak模型,的意见被产生。方法与软件SimWeld在RWTHAachen大学由ISF开发了的模拟被实现并且调查。
简介:NUK儿童安全牙膏德国品质无氟温和配方,有效保护宝宝牙龈与牙齿本品为婴幼儿专用配方,不含氟、刺激性SLS、麸质、糖和人工甜昧剂,温和无刺激。保护宝宝萌出的第一颗小乳牙,温和清洁宝宝口腔。含木糖醇和维生素E,有效营养牙龈并预防蛀牙,清新的苹果香蕉味,让宝宝不抗拒刷牙。德国制造,原装进口,符合欧盟与国标标准。经典升级非同以往植村秀全新如胶似漆眼线笔2013年.植村秀推出第一款具有划时代意义的笔状眼线胶.并以其柔滑如胶、浓郁似漆的特点在眼线市场上拔得头筹。2017年。如胶似漆