di
gstructuresoa
alysisa
ddesig
theweldi
gprocessofthesidebeama
dfixtureMa
ufacturi
gi
dustryoverallabilitya
dlevel，directrelatetothe
atio
aleco
omicpote
tiality
atio
aldefe
sestre
gth，comprehe
sive
atio
alstre
gtha
di
globaleco
omiccompetitio
a
dcooperatio
abilityisalsodecidi
gourcou
trySmodemizatio
a
dthe
atio
alrevivaladva
ceme
t．Asahighlyefficie
tweldi
gmethods，theC02shieldedweldi
ghasobmi
edthewidespreadmilk．io
i
ourcou
tryi
dustryalltheeco
omySareas．However，theColgasshieldedweldi
gis
otperfecti
theUSeofactualproductio
，ithaspoorweldsmooth
essa
dmoreflyi
gsi
weldi
gma
ufacturi
ge
terprises．MAGweldi
gMetalActiveGasARCWeldi
gisaweldi
gmethodusi
gofi
ertgasAra
dsomeactivegasC02asaprotectivegas．ComparedwiththeC02gasshieldedarcweldi
g，MAGweldi
ghasu
iqueadva
tages．I
thispaperthroughtheoreticala
alysis，experime
talverificatio
aswellastheactualproductio
oftwotypesofweldi
gproductswerea
alyzed，a
dfurtherproofofmixedgasesa
dthemixi
gratiooftheweldi
gqualityoftheproductsmai
lyforthestabilityofweldi
gprocess，weldshape，wellasmecha
icalproperties，assuchasweldi
ga
dtheweldi
gcosts．Toillustratetherichargo
weldi
gMAGweldi
ge
gagedi
ma
ufacturi
gi
dustrieshasabroadprospect．Withthedevelopme
tofcomputertech
ologyusi
gcomputertech
ologytosimulatetheweldi
gprocess，isa
ewmea
sofresearch．Fi
iteEleme
tA
alysisBasedo
theweldi
gprocesstemperature，hydroge
diffusio
modeli
gtodoabriefi
troductio
，a
dthroughexperime
talapproachtoverifytheactualweldi
goperatio
withtheweldi
gprocesstheresultsofcomputersimulatio
oftheapproximatio
．KeyWords：CRH3BogieframeNCmachi
i
gprocessWeldi
gprocessFixturedesig
i
gTheC02shieldedweldi
gMAGweldi
g
2
f华东交通大学
目录
第一章绪论51．1课题背景51．2国内外发展现状613课题的意义71．4课题研究的主要内容7第二章CRH3动车组转向架构架的组成821转向构架的概述r