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1、天津大學(xué)碩士學(xué)位論文雙絲脈沖MIG焊工藝研究姓名：劉輝申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料加工工程指導(dǎo)教師：李桓20070101摘要焊接的高效化、環(huán)保化，智能化成了2l世紀(jì)鋼結(jié)構(gòu)制造業(yè)發(fā)展的迫切要求。對(duì)于普通MIG／MAG焊來(lái)說，焊接速度提高會(huì)導(dǎo)致未焊透、焊縫成形惡化等焊接缺陷，在解決上述問題的前提下，本文旨在研究完善一種高效、實(shí)用的雙絲脈沖MIG焊接工藝。本研究課題采用了Tandem型雙絲脈沖MIG焊試驗(yàn)系統(tǒng)，兩臺(tái)焊機(jī)通過雙絲脈沖控制器連接，實(shí)現(xiàn)推挽式輸出，以減小兩個(gè)電弧之間的干擾。兩焊絲相互隔離，由兩臺(tái)電
2、源分別供電，避免了電源之間的相互影響，使焊接電弧得到較好的控制。本論文在深入分析雙絲脈沖MIG焊接過程的機(jī)理后，針對(duì)影響焊接過程的主要工藝參數(shù)，通過大量的試驗(yàn)，研究了前后絲均采用直徑01．2mm焊絲和前絲采用直徑01．2mm焊絲后絲采用直徑01．6mm焊絲兩種情況下焊接電流、焊接電壓、脈沖頻率、脈寬比、焊絲傾角、干伸長(zhǎng)度等不同參數(shù)對(duì)焊接過程的影響規(guī)律，采用了高速攝像／攝影手段觀測(cè)各組試驗(yàn)參數(shù)下的熔滴過渡和電弧行為，結(jié)合為本試驗(yàn)開發(fā)的焊接信號(hào)采集測(cè)試分析軟件，確定了對(duì)實(shí)際工程焊接有實(shí)際指導(dǎo)意義的參數(shù)范圍
3、。關(guān)鍵詞：MIG焊雙絲脈沖熔滴過渡工藝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
