双丝脉冲MIG焊工艺研究

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1、天津大学硕士学位论文双丝脉冲MIG焊工艺研究姓名：刘辉申请学位级别：硕士专业：材料加工工程指导教师：李桓20070101摘要焊接的高效化、环保化，智能化成了2l世纪钢结构制造业发展的迫切要求。对于普通MIG／MAG焊来说，焊接速度提高会导致未焊透、焊缝成形恶化等焊接缺陷，在解决上述问题的前提下，本文旨在研究完善一种高效、实用的双丝脉冲MIG焊接工艺。本研究课题采用了Tandem型双丝脉冲MIG焊试验系统，两台焊机通过双丝脉冲控制器连接，实现推挽式输出，以减小两个电弧之间的干扰。两焊丝相互隔离，由两台电

2、源分别供电，避免了电源之间的相互影响，使焊接电弧得到较好的控制。本论文在深入分析双丝脉冲MIG焊接过程的机理后，针对影响焊接过程的主要工艺参数，通过大量的试验，研究了前后丝均采用直径01．2mm焊丝和前丝采用直径01．2mm焊丝后丝采用直径01．6mm焊丝两种情况下焊接电流、焊接电压、脉冲频率、脉宽比、焊丝倾角、干伸长度等不同参数对焊接过程的影响规律，采用了高速摄像／摄影手段观测各组试验参数下的熔滴过渡和电弧行为，结合为本试验开发的焊接信号采集测试分析软件，确定了对实际工程焊接有实际指导意义的参数范围

3、。关键词：MIG焊双丝脉冲熔滴过渡工艺ABSTRACTTheefficiency,environmentalismandintelligentizeofweldinghavebecometheurgentneedofthedevelopmentofthesteelstructurein21ncentury．AsforthenormalMIG／MAG,weldingdefectssuchasincompletepenetration，worscnmgformationofweldwouldbecause

4、dwhentheweldingspeedwasincreased．Tosolvetheproblemsaboveinpremise，allefficientandappliedTandempulsedMIGhasbeenstudiedinthispaper．TheresearchdevelopedTandempulsedMIGsystem，inwhichthetwoweldingpowerSOUl'Ceswereconnectedbythedouble-wirepulsedcontroller．The

5、controllerimplementedthepush-pulloutputofthetwoweldingpowersourcesandthusreducedtheinterfIerencebetweenthetwoarcs．Thetwoarcweldingtorcheswereindependentwithoutelectricconnectionandtheirpowerreceivedfromtworespectiveweldingpowersources．Thisdesignavoidedt

6、heinfluencebetweenthetwoweldingpowersourcesandmadethearcwellcontrolled．Thispaperhasanalyzedthetheoryofthedouble-wirepulsedMIGforthemainparametersinfluencedtheweldingprocessthroughalotoftrials．Thisresearchadoptedtwoweldingprocessmethodwhichincludingthebo

7、thwireusedO1．2mmwireandtheleadingwireusedO1．2mmwirewhiletravlingwireusedO1．6mmwire，thencomparedtheparametersinthetwoweldingprocesssuchastheweldingcurrent,weldingvoltage，pulsedfrequency，pulsedwidthratio，wireangleandthestemelongationwhichaffectedtheweldin

8、gprocess．Usinghigh—speedcamera／photography，themetaltransferandarcbehaviorunderdifferentweldingparameterswereobservedandrecorded．combinedthephotoelectricitysignaltestingsystemforthistrial，theparameterrangewhichwastheguidelinesfort