AWS - GMAW Fundamentals
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Transcript of AWS - GMAW Fundamentals
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GMAW FundamentalsGMAW Fundamentals
Gas Metal Arc Welding
Metal Inert Gas
By: Wanda Sue Benton
ESAB University & Florence-Darlington Tecnical !ollege
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IntroductionIntroduction
GMAW is de"ined as arc #elding using a
continuously "ed consu$a%le electrode and
a sielding gasGMAW is also 'no#n as MIG (Metal Inert
Gas)
*roduces ig-+uality #elds
,ields ig roductivity
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AdvantagesAdvantages
.arge gas "illed or %ridged easily
Welding can %e done in all ositions
/o slag re$oval re+uired
0ig #elding seeds
0ig #eld +uality.ess distortion o" #or' iece
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Types of Metal TransferTypes of Metal Transfer
Te %asic GMAW rocess includes tree
distinctive rocess tecni+ues:
1 Sort !ircuit (Sort Arc)
2 Glo%ular Trans"er
3 Sray Arc Trans"er
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Short Circuit (Short Arc)Short Circuit (Short Arc)
4erates at lo# voltages and #eldingcurrent
S$all "ast-"ree5ing #eld uddle o%tainedUse"ul in 6oining tin $aterials in any
osition7 as #ell as tic' $aterials in
vertical and overead ositionsMetal trans"er occurs #en an electrical
sort circuit is esta%lised
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Gloular TransferGloular Transfer
Welding current and #ire seed are
increased a%ove $a8i$u$ "or sort arc
Drolets o" $etal ave a greater dia$eter
tan te #ire %eing used
Satter resent
Welding is $ost e""ectively done in te "lat
osition #en using glo%ular trans"er
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Spray Arc TransferSpray Arc Transfer
4ccurs #en te current and voltage
settings are increased iger tan tat used
"or Glo%ular Trans"erUsed on tic' sections o" %ase $aterial7 %est
suited "or "lat osition due to large #eld
uddleSatter is $ini$al to none
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Manual GMAW !"uipmentManual GMAW !"uipment
Tree $a6or ele$ents are :
1) Welding torc and accessories
2) Welding control & Wire "eed $otor
3) *o#er Source
GMAW e+ui$ent can %e used eiter
$anually or auto$atically
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WI9E !4/T94.
&
WI9E FEED M4T49
*4WE9 S4U9!E
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Welding Torch # AccessoriesWelding Torch # Accessories
Te #elding torc guides te #ire and
sielding gas to te #eld 5one
Brings #elding o#er to te #ire also
Ma6or co$onentsarts o" te torc are te
contact ti7 sielding gas no55le7 gas
di""user7 and te #ire conduit
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T9IGGE9
I/STA..ED
!4M*4/E/TS
/4;;.E
!4/TA!T TI*
GAS DIFFUSE9
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Welding Control # WireWelding Control # Wire
Feed MotorFeed MotorWelding control & Wire "eed $otor are
co$%ined into one unit
Main "unction is to ull te #ire "ro$ te
sool and "eed it to te arc
!ontrols #ire "eed seed and regulates te
starting and stoing o" #ire "eed
Wire "eed seed controls A$erage
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WI9E FEEDE9
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$o%er Source$o%er Source
Al$ost all GMAW is done #it reverse olarityalso 'no#n as D!E*
*ositive (
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*4SITI=E
TE9MI/A.
/EGATI=E
TE9MI/A.
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Shielding GasesShielding Gases
*urose o" sielding gas is te rotect te#eld area "ro$ te conta$inants in te
at$osereGas can %e Inert7 9eactive7 or Mi8tures o"
%ot
Gas "lo# rate is %et#een 2>-3> !F0Argon7 0eliu$7 and !ar%on Dio8ide are te
$ain tree gases used in GMAW
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F.4W METE9
!,.!I/DE9
*9ESSU9E
GAUGE
!F0 *9ESSU9E
AD?USTME/T
@/4B