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16
HF ARC IGNITION FOR TIG WELDING
(&HIGHFREQUENCY IGNITIONALLOWSTHEARCTOBESTARTEDIN4)'TUNGSTENINERTGAS WELDING
WITHOUTTOUCHINGTHETUNGSTENTOTHEWORKPIECE"YDEPRESSINGTHEFOOTPEDALTHEMACHINEWILL
ACTIVATETHEGASmOWANDINTRODUCETHE(&HIGHFREQUENCY HIGHVOLTAGE SPARKTHIShIONIZESv
THEAIRGAPMAKINGITCONDUCTIVEALLOWINGANARCTOBECREATEDWITHOUTTOUCHINGTHETUNGSTEN
TOTHEWORKPIECE4HEGASMOLECULESARESUPERHEATEDBYTHEARCCREATINGASTREAMOFSUPER
HEATEDGASTHATCHANGESTHEMOLECULARSTRUCTUREPRODUCINGAPLASMASTREAM4HISPLASMA
STREAMPROVIDESHEATANDENERGYTHATALLOWSUSTOMELTANDFUSEMETALSINANINERTGASSHIELDED
ENVIRONMENTKNOWNAS4)'TUNGSTENINERTGAS WELDING
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Gas
molecules
Gas flow
HF
Plasma
stream
%
&
'
(
&
'
High
current
Low
current
Power source
Argon
gas
Nozzle
DC TIG WELDING
www.CKWORLDWIDE.com
4HE$#POWERSOURCEPRODUCESWHATISKNOWNAS$#DIRECTCURRENT INWHICHTHEMAIN
ELECTRICALCOMPONENTKNOWNASELECTRONSmOWINONLYONEDIRECTIONFROMTHENEGATIVEPOLE
TERMINAL TOTHEPOSITIVEPOLETERMINAL )NTHE$#ELECTRICALCIRCUITTHEREISANELECTRICAL
PRINCIPLEATWORKWHICHSHOULDALWAYSBETAKENINTOACCOUNTWHENUSINGANY$#CIRCUIT
7ITHA$#CIRCUITOFTHEENERGYHEAT ISALWAYSONTHEPOSITIVESIDE4HISNEEDSTOBE
UNDERSTOODBECAUSEITDETERMINESWHATTERMINALTHE4)'TORCHWILLBECONNECTEDTOTHISRULE
APPLIESTOALLTHEOTHERFORMSOF$#WELDINGASWELL
$#4)'WELDINGISAPROCESSINWHICHANARCISSTRUCKBETWEENATUNGSTENELECTRODEANDTHE
METALWORKPIECE4HEWELDAREAISSHIELDEDBYANINERTGASmOWTOPREVENTCONTAMINATIONOF
THETUNGSTENMOLTENPOOLANDWELDAREA7HENTHE4)'ARCISSTRUCKTHEINERTGASISIONIZED
ANDSUPERHEATEDCHANGINGITSMOLECULARSTRUCTUREWHICHCONVERTSITINTOAPLASMASTREAM
4HISPLASMASTREAMmOWINGBETWEENTHETUNGSTENANDTHEWORKPIECEISTHE4)'ARCANDCAN
BEASHOTASª&ª# )TISAVERYPUREANDCONCENTRATEDARCWHICHPROVIDESTHE
CONTROLLEDMELTINGOFMOSTMETALSINTOAWELDPOOL4)'WELDINGOFFERSTHEUSERTHEGREATEST
AMOUNTOFmEXIBILITYTOWELDTHEWIDESTRANGEOFMATERIALANDTHICKNESSANDTYPES$#4)'
WELDINGISALSOTHECLEANESTWELDWITHNOSPARKSORSPATTER
4HEINTENSITYOFTHEARCISPROPORTIONALTOTHECURRENTTHATmOWSFROMTHETUNGSTEN
4HEWELDERREGULATESTHEWELDINGCURRENTTOADJUSTTHEPOWEROFTHEARC4HINMATERIAL
REQUIRESALESSPOWERFULARCWITHLESSHEATTOMELTTHEMATERIALSOLESSCURRENTAMPS IS
REQUIRED4HICKERMATERIALREQUIRESAMOREPOWERFULARCWITHMOREHEATSOMORECURRENT
AMPS ARENECESSARYTOMELTTHEMATERIAL