34
1: Tungsten burning away quickly
0/33)",%2%!3/.
35''%34%$2%-%$9
Incorrect Gas
#HECKTHATPURE!RGONISBEINGUSED
No gas
#HECKTHEGASCYLINDERCONTAINSGASANDISCONNECTED
Inadequate gas flow
#HECKTHEGASISCONNECTEDCHECKHOSESGASVALVEANDTORCHARENOTRESTRICTED3ETTHEGASmOW
BETWEENn#&(n,-. mOWRATE
Back cap not fitted correctly
-AKESURETHETORCHBACKCAPISlTTEDSOTHATTHEORINGISINSIDETHETORCHBODY
Torch connected to DC +
#ONNECTTHETORCHTOTHE$# nOUTPUTTERMINAL
Incorrect tungsten being used
#HECKANDCHANGETHETUNGSTENTYPEIFNECESSARY
Tungsten being oxidized after weld is
finished
+EEPSHIELDINGGASmOWINGnSECONDSAFTERARCSTOPPAGESECONDFOREACHAMPSOFWELD
CURRENT
Tungsten melting back into the
nozzle on AC welding
#HECKTHATCORRECTTYPEOFTUNGSTENISBEINGUSED#HECKTHEBALANCECONTROLISNOTSETTOOHIGH
REDUCETOALOWERSETTING
2: Contaminated tungsten
0/33)",%2%!3/.
35''%34%$2%-%$9
Touching tungsten into the weld pool
+EEPTUNGSTENFROMCONTACTINGWELDPUDDLE2AISETHETORCHSOTHATTHETUNGSTENISOFFOFTHEWORKPIECE
nn MM
Touching the filler wire to the tungsten
+EEPTHElLLERWIREFROMTOUCHINGTHETUNGSTENDURINGWELDINGFEEDTHElLLERWIREINTOTHELEADINGEDGEOF
THEWELDPOOLINFRONTOFTHETUNGSTEN
Tungsten melting into the weld pool
#HECKTHATCORRECTTYPEOFTUNGSTENISBEINGUSED4OOMUCHCURRENTFORTHETUNGSTENSIZESOREDUCETHE
AMPSORCHANGETOALARGERTUNGSTEN
3: Porosity — poor weld appearance and color
0/33)",%2%!3/.
35''%34%$2%-%$9
Incorrect Gas
#HECKTHATPURE!RGONISBEINGUSED
Inadequate gas flow / gas leaks
#HECKTHEGASISCONNECTEDCHECKHOSESGASVALVEANDTORCHARENOTRESTRICTED3ETTHEGASmOW
BETWEENn#&(n,-. mOWRATE#HECKHOSESANDlTTINGSFORHOLESLEAKSETC
Moisture on the base metal
2EMOVEALLMOISTUREFROMBASEMETALBEFOREWELDING
Contaminated base metal
2EMOVEMATERIALSLIKEPAINTGREASEOILANDDIRTINCLUDINGMILLSCALEFROMBASEMETAL
Contaminated filler wire
2EMOVEALLGREASEOILORMOISTUREFROMlLLERMETAL
Incorrect filler wire
#HECKTHElLLERWIREANDCHANGEIFNECESSARY
4: Yellowish residue / smoke on the alumina nozzle & discolored tungsten
0/33)",%2%!3/.
35''%34%$2%-%$9
Incorrect Gas
5SEPURE!RGONGAS
Inadequate gas flow
3ETTHEGASmOWBETWEENn#&(n,-. mOWRATE
Inadequate post flow gas
)NCREASETHEPOSTmOWGASTIME
Alumina gas nozzle too small for size of
tungsten being used
)NCREASETHESIZEOFTHEALUMINAGASNOZZLE
5: Unstable arc during DC welding
0/33)",%2%!3/.
35''%34%$2%-%$9
Torch connected to DC +
#ONNECTTHETORCHTOTHE$#nOUTPUTTERMINAL
Contaminated base metal
2EMOVEMATERIALSLIKEPAINTGREASEOILANDDIRTINCLUDINGMILLSCALEFROMBASEMETAL
Tungsten is contaminated
2EMOVEMM OFCONTAMINATEDTUNGSTENANDREGRINDTHETUNGSTEN
Arc length too long
,OWERTORCHSOTHATTHETUNGSTENISOFFOFTHEWORKPIECEnn MM
6: Unstable arc during AC welding
0/33)",%2%!3/.
35''%34%$2%-%$9
Incorrect gas or inadequate gas flow
#HECKTHATPURE!RGONISBEINGUSED#HECKTHEGASISCONNECTEDCHECKHOSESGASVALVEANDTORCHARE
NOTRESTRICTED3ETTHEGASmOWBETWEENn#&(n,-. mOWRATEmOWRATE
Incorrect tungsten being used
#HECKANDCHANGETHETUNGSTENTYPEIFNECESSARY
Tungsten is contaminated
2EMOVEMM OFCONTAMINATEDTUNGSTENANDREGRINDTHETUNGSTEN
Improperly prepared tungsten
5SEAPOINTEDTUNGSTENWITH!#3QUAREWAVEINVERTERMACHINES4HEPOINTWILLROUNDOFFAFTERWELDING
Excessive rectification in the base metal
!DJUSTBALANCECONTROL)NCREASETRAVELSPEED!DDlLLERWIREDURINGWELDING
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GTAW (TIG) WELDING TROUBLESHOOTING
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