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简介：本文探讨了交流频率对铝合金VPPA焊接的影响规律,研究了交流频率在40Hz及52Hz两种情况下,3mm厚的5A06铝合金VPPA焊接穿孔工艺特点。结果表明,当交流频率增大时,焊漏宽度与焊漏高度均增大,咬边产生的几率减小,有利于薄板焊接。频率增大,热影响区与焊缝中心的弥散相有增大的趋势,但并不影响接头的拉伸性能。

简介：针对δ1.5和δ3.0的TC4钛板手工直流A-TIG焊焊缝成形特点及其形成机理进行了系统的研究。研究表明,无论是钛合金TC4的TIG焊还是A-TIG焊,焊接电流和焊接速度对熔深熔宽的影响趋势相同。但在相同焊接工艺条件下,与TIG焊相比,A-TIG焊的熔深大、熔宽小。分析认为,其主要原因是活性焊剂引起的电弧收缩效应和液态熔池表面张力效应。

简介：本文主要介绍了镍基合金的分类、可焊性及焊接工艺特性、焊接方法、焊接材料的选用。焊接时试件表面应严格清理,从合金元素对焊接性能的影响、线能量和层间温度的控制以及焊后热处理方面,对镍基合金材料的焊接有一个详细了解。

简介：镁合金的焊接技术较镁合金其它成形技术(尤其是压铸)发展较缓慢,现在正处在起步阶段,但是随着汽车和航空领域需求的强力推动,镁合金焊接技术必将得到迅速发展。

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简介：TIGweldingwasusedtodepositCo-8.8Al-9.8W-0.2Bsuperalloyon304austenitestainlesssteel.Theformfactorofweld,dilutionratio,microhardness,microstructureanddistributionofalloyingelementswereinvestigated.Themicrostructureofcladdinglayerwasmainlyhypoeutectic.Theprimaryphaseswerecobalt-richsolidsolution.Theeutecticphasewascomposedofcobalt-richsolidsolution,Co6W6CandCoCx.Whentheboroncontentincreasedfrom0.2%to0.5%,thedilutionratiodecreased,theprimaryphasebecamecoarseandthemicrohardnessdecreased.Whentheboroncontentwasfrom0.5%to2%,thedilutionratioandmicrohardnessincreasedobviously,buttheprimaryphasewasrefined.ThehardphaseofCo-8.8Al-9.8Wbecamerefinedandtheamountwasraised,andtheperformanceofcladdinglayerwasimprovedwithappropriateboronincrease.

简介：Bead-on-plateCO2laserweldingof1000MPagradetransformationinducedplasticity(TRIP)steelwasconductedunderdifferentweldingpowers,weldingspeedsandshieldgases.Themacrostructuralandmicrostructuralfeaturesoftheweldedjointwereinvestigated.Theincreaseofweldingspeedreducedthewidthoftheweldbeadandtheporositiesintheweldbeadresultingfromthedifferentflowmodeofmeltedmetalinweldpool.ThedecreaseofweldingpoweroruseofshieldgasofheliumalsocontributedtothereductionofporosityinBead-on-plateCO2laserweldingof1000MPagradetransformationinducedplasticity(TRIP)steelwasconductedunderdifferentweldingpowers,weldingspeedsandshieldgases.Themacrostructuralandmicrostructuralfeaturesoftheweldedjointwereinvestigated.Theincreaseofweldingspeedreducedthewidthoftheweldbeadandtheporositiesintheweldbeadresultingfromthedifferentflowmodeofmeltedmetalinweldpool.Thedecreaseofweldingpoweroruseofshieldgasofheliumalsocontributedtothereductionofporosityintheweldbeadduetothealleviationofinducedplasmaformation,thusstabilizingthekeyhole.TheporosityformationintimatelycorrelatedwiththeevaporationofalloyelementMninthebasemetal.Thelaserweldedmetalhadsamemartensitemicrostructureasthatofwater-quenchedbasemetal.Theweldingparameterswhichincreasedcoolingrateallledtofinemicrostructuresoftheweldbead.

简介：本项目研发一种能够满足铝及其合金焊接工艺要求的高端数字化逆变式焊机。采用研究成熟的软开逆变主回路和双CPU高精度控制系统的控制回路,新型智能PI算法实现铝及其合金高要求的焊接。采用DeviceNet通讯协议,实现与焊接机器人的配套,应用到自动化生产中。此外,相移软开关技术使逆变电源的开关损耗趋近于0,大大提高了设备的可靠性,且使产品具有体积小、重量轻、节能、功率因数高等优点,又体现出其环保、节能的优势特点。

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简介：Duetothedisturbancesofspatters,dustsandstrongarclight,itisdifficulttodetectthemoltenpooledgeandtheweldlinelocationinCO2weldingprocesses.Themedianfilteringandself-multiplicationwasemployedtopreprocesstheimageoftheCO2weldinginordertodetecteffectivelytheedgeofmoltenpoolandthelocationofweldline.TheB-splinewaveletalgorithmhasbeeninvestigated,theinfluenceofdifferentscalesandthresholdsontheresultsoftheedgedetectionhavebeencomparedandanalyzed.TheexperimentalresultsshowthatbetterperformancetoextracttheedgeofthemoltenpoolandthelocationofweldlinecanbeobtainedbyusingtheB-splinewavelettransform.Theproposededgedetectionapproachcanbefurtherappliedtothecontrolofmoltendepthandtheseamtracking.

简介：LaserweldingwithfillerwireofAZ31magnesiumalloysisinvestigatedusingaCO2laserexperimentalsystem.Theeffectofthreedifferentfillerwiresonthejointpropertiesisresearched.Theresultsshowthattheweldappearancecanbeeffectivelyimprovedwhenusinglaserweldingwithfillerwire.ThemicrohardnessandtensilestrengthofjointsarealmostthesameasthoseofthebasemetalwhenERAZ31orERAZ61wireisadopted.However,whenthefillerwireofER5356aluminumalloyisused,themechanicalpropertiesofjointsbecomeworse.ForERAZ31andERAZ61fillerwires,themicrostructureofweldzoneshowssmalldendritegrains.Incomparison,forER5356fillerwire,theweldshowsastructureofsnowydendritesandmanyintermetalliccompoundsandeutecticphasesdistributeinthedendrites.Theseintermetallicconstituentswithlowmeltingpointincreasethetendencyofhotcrackandresultinfragilejointproperties.Therefore,ERAZ31andERAZ61wirearemoresuitablefillermaterialthanER5356forCO2laserweldingofAZ31magnesiumalloys.

简介：本文研究两种焊丝在不同的坡口角度时对低合金高强钢焊接接头性能的影响。试验结果表明,接头抗拉强度主要受到焊丝合金成分和焊缝显微组织的影响,而受坡口角大小影响不大。先共析铁素体对抗拉强度有害,获得以针状铁素体为主的焊缝组织可有效提高抗拉强度。焊接接头焊缝及热影响区受坡口角变化影响较小,而熔合区则随着坡口角的增加,冲击韧性逐渐提高。

简介：ＣｏｍｐａｒｉｓｏｎｏｆｍｅｃｈａｎｉｃａｌｐｒｏｐｅｒｔｉｅｓｉｎｗｅｌｄｅｄｊｏｉｎｔｆｏｒＣＯ２ａｒｃｗｅｌｄｉｎｇｂｙｕｓｉｎｇｔｈｅｍｉｃｒｏ－ｓｈｅａｒｔｅｓｔａｎｄｉｍｐａｃｔｔｅｓｔ￥ＺｈｏｕＬｉｘｉａ；ＷａｎｇＳｈｉｙｕａｎａｎｄ?..

简介：Thispaperintroducedthebasictheoryandalgorithmofthesurrogatedatamethod,whichproposedarigorouswaytodetecttherandomandseeminglystochasticcharacteristicsinasystem.TheGaussiandataandtheRosslerdatawereusedtoshowtheavailabilityandeffectivityofthismethod.Accordingtotheanalysisbythismethodbasedontheshort-circuitingcurrentsignalsundertheconditionsofthesamevoltageanddifferentwirefeedspeeds,itisdemonstratedthattheelectricalsignalstimeseriesexhibitapparentlyrandomnesswhentheweldingparametersdonotmatch.However,theelectricalsignalstimeseriesaredeterministicwhenamatchisfound.Thestabilityofshort-circuitingtransferprocesscouldbejudgedexactlybythemethodofsurrogatedata.

简介：本试验利用CMT-TWIN双丝焊接技术,在Q235基体上堆焊Φ1.2ER5356和Φ1.2ER50S-6,以获得致密、无裂纹孔洞等缺陷的Fe-Al堆焊层。堆焊层主要由柱状晶组成,内部析出了细小的弥散相,EDS表明堆焊层存在Fe3Al。硬度测试表明：熔合区硬度分布不均匀,硬度峰值达450HV,而焊缝中心区硬度大致在350-400HV之间,表明此区域可能含Fe3Al较多。

简介：本文建立了镁合金气保护焊中飞溅和气孔的产生机理,示范了消除措施,并为填充金属制造商和用户提出了预防气孔产生的一些建议。

简介：中航工业·北京赛福斯特技术有限公司（中国搅拌摩擦焊中心）是国内首家获得英国焊接研究所（TM）授权的搅拌摩擦焊技术开发和推广中心，是中国搅拌摩擦焊技术先锋和开拓者。2016年9月，赛福斯特公司为韩国某宇航企业研制大幅面镁合金厚板焊接产品，成功实现45mm厚AZ31B镁合金平板对接。