Weco Discovery 200 AC/DC User manual

Cod. 006.0001.0340
15/04/2021 V.2.13
Discovery 200AC/DC
Instruction manual
ENG
Translation of original instructions

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INDEX
1 INTRODUCTION.......................................................................................................................................... 4
1.1 INTRODUCTION.......................................................................................................................................... 5
2 INSTALLATION .......................................................................................................................................... 6
2.1 CONNECTIONS TO THE ELECTRICAL MAINS NETWORK...................................................................... 6
2.2 FRONT PANEL............................................................................................................................................. 6
2.3 REAR PANEL............................................................................................................................................... 7
2.4 PREPARING FOR MMA WELDING............................................................................................................. 8
2.5 PREPARING FOR TIG WELDING ............................................................................................................... 9
3 USER INTERFACE .................................................................................................................................... 10
4 UNIT POWER-UP ...................................................................................................................................... 13
5 RESET (LOAD FACTORY SETTINGS)..................................................................................................... 14
6 SET-UP (INITIAL SET-UP OF THE WELDING POWER SOURCE) ......................................................... 15
7 ALARM MANAGEMENT ........................................................................................................................... 18
8 MMA WELDING ........................................................................................................................................ 21
8.1 TIG WELDING/GOUGING - FIRST LEVEL MENU.................................................................................... 21
8.2 MMA /GOUGING WELDING -SECOND LEVEL MENU............................................................................. 22
8.3 MMA WELDING - SPECIAL FUNCTIONS ................................................................................................. 24
9 TIG WELDING ........................................................................................................................................... 25
9.1 TIG WELDING - FIRST LEVEL MENU ...................................................................................................... 25
9.2 TIG WELDING - SECOND LEVEL MENU ................................................................................................. 29
9.3 TIG DC WELDING - SPECIAL FUNCTIONS MENU ................................................................................. 33
9.4 TIG AC WELDING - SPECIAL FUNCTIONS MENU.................................................................................. 36
10 TORCH TRIGGER PROCEDURE ............................................................................................................. 41
10.1 2 STROKE SPOT - Q-SPOT FUNCTION .................................................................................................. 47
11 JOBS MANAGEMENT .............................................................................................................................. 53
11.1 SAVING A JOB ........................................................................................................................................... 53
11.2 DELETING A JOB ...................................................................................................................................... 54
11.3 LOADING A JOB ........................................................................................................................................ 55
11.4 SELECTING JOBS USING THE TORCH BUTTONS ................................................................................ 55
12 TECHNICAL DATA .................................................................................................................................... 56
12.1 CRUISER 322 AC/DC - POWER PULSE 322 AC/DC................................................................................ 56
12.2 CRUISER 402 AC/DC - POWER PULSE 402 AC/DC................................................................................ 57
12.3 CRUISER 502 AC/DC - POWER PULSE 502 AC/DC................................................................................ 58
13 ELECTRICAL DIAGRAM .......................................................................................................................... 59
13.1 CRUISER 322 AC/DC - POWER PULSE 322 AC/DC................................................................................ 59
13.2 CRUISER 402/502 AC/DC - POWER PULSE 402/502 AC/DC.................................................................. 65
13.3 “REMOTE 1” CONNECTOR ...................................................................................................................... 70
13.4 “IR” CONNECTOR ..................................................................................................................................... 70
13.5 TORCH CONNECTOR (front panel) .......................................................................................................... 70
13.6 REMOTE CONTROL CONNECTOR (back panel)..................................................................................... 70
14 SPARE PARTS .......................................................................................................................................... 72
14.1 CRUISER 322 AC/DC - POWER PULSE 322 AC/DC................................................................................ 72
14.2 CRUISER 402/502 AC/DC - POWER PULSE 402/502 AC/DC.................................................................. 74

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1 INTRODUCTION
IMPORTANT!
This handbook must be consigned to the user prior to installation and commissioning of the unit.
Read the "General prescriptions for use" handbook supplied separately from this handbook before
installing and commissioning the unit.
The meaning of the symbols in this manual and the associated precautionary information are given in
the "General prescriptions for use”.
If the "General prescriptions for use" are not present, it is mandatory to request a replacement copy
from the manufacturer or from your dealer.
Retain these documents for future consultation.
LEGEND
DANGER!
This pictogram warns of danger of death or serious injury.
WARNING!
This pictogram warns of a risk of injury or damage to property.
CAUTION!
This pictogram warns of a potentially hazardous situation.
INFORMATION
This pictogram gives important information concerning the execution of the relevant operations.
 Thissymbolidentiesanactionthatoccursautomaticallyasaresultofapreviousaction.
 Thissymbolidentiesadditionalinformationorareferencetoadifferentsectionofthemanual
containing the associated information.
§ Thissymbolidentiesareferencetoachapterofthemanual.
*1 The symbol refers to the associated numbered note.
NOTES
Theguresinthismanualarepurelyguidelineandtheimagesmaycontaindifferenceswithrespectto
theactualequipmenttowhichtheyrefer.

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1.1 INTRODUCTION
Discovery200AC/DCisanadvancedtechnologysingle-phaseweldingpowersourceforACandDC
TIGweldingoperations.
ACTIGfunctionsareidealforaluminium,magnesiumandrelatedalloyswelding.
ACTIGweldingisoptimizedthanksto:
Synergicarcignitionselectionlocatedonthefrontpanel,itmodiestheignitionaccordingtoelectrode
diameter.
AdvancedSoftAC-SquareWaveformforoutstandingweldingqualitythroughfasterweldingspeed,bet-
ter pool control and noise reduction.
Mildsteel,stainlesssteelandcoppercanbeeasilyweldedinDCTIG.
SlowPulse(0.1Hz-5.0Hz)andFastPulse(5.0Hz-250Hz)areavailableinTIGDC.
SpecialHFcontrolprovides100%rapidandprecisearcignition.
Upto3,25mmdiameterelectrodeweldingispossibleinMMA.
Accessories/ancillary devices that can be connected to the unit:
- Overcutdevicetoprotectthepowersourcefrompowersupplyvoltagespikesthatcoulddamage
the electrical components.
-Manualremotecontrollerforremoteadjustmentoftheweldingcurrent.
-Foot-pedalremotecontrollerforTIGtorcharcstrikingandremoteadjustmentofweldingcurrent.
- Liquid cooler group for TIG torches.
-Powersourcetrolley.
Consultyourdealerforanupdatedlistofaccessoriesandthelatestnewproductsavailable.

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2 INSTALLATION
DANGER!
Lifting and positioning
Read the warnings highlighted by the following symbols in the “General prescriptions for use”.
2.1 CONNECTIONS TO THE ELECTRICAL MAINS NETWORK
Thecharacteristicsofthemainspowersupplytowhichtheequipmentshallbeconnectedaregivenin
chapter entitled “12 TECHNICAL DATA” on page 54.
Themachinecanbeconnectedtomotor-generatorsprovidedtheirvoltageisstabilised.
Connect/disconnectthevariousdeviceswiththemachineswitchedoff.
2.2 FRONT PANEL
431 2
○ Negativepoleweldingsocket[Item1].
○ Connectorforgasfeedhose:torchpowersource[Item2].
○ TIGTORCHweldingsocket.3].[Item3].
○ Positivepoleweldingsocket.[Item4].

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2.3 REAR PANEL
3 4
1
5
2
1 2 3 4
○ Powercable.[Item1].
• Totallength(includinginternalpart):2,5m
• Numberandcrosssectionofwires:3x2,5mm2
• Powerplugtype:Schuko
○ Coolergrouppowerfeedingconnector.[Item2].
• Voltage:230Va.c.
• Currentoutput:1.0A
• IPprotectionrating:IP20(capopen)/IP66(capclosed)
DANGER!
High voltage!
If the socket is not connected to any devices always close cap 1
○ Connectorforgasfeedhose:cylinderpowersource[Item3]
○ PowersourceON/OFFswitch.[Item4].

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2.4 PREPARING FOR MMA WELDING
1. SettheweldingpowersourceON/OFFswitchto“O”(unitswitchedoff).
2. Plugthepowercableplugintoamainssocketoutlet.
3. Choosetheelectrodebasedonthetypeofmaterialandthicknessoftheworkpiecetobewelded.
4. Insert the electrode in the electrode holder.
5. Connecttheelectrodeholdercabletotheweldingsocketbasedonthepolarityrequestedbythe
type of electrode used.
6. Connecttheplugofthegroundclamptotheweldingsocketonthebasisofthepolarityrequired.
7. Connecttheearthclamptotheworkpiecebeingprocessed.
DANGER!
Electric shock hazard!
Read the warnings highlighted by the following symbols in the “General prescriptions for use”.
8. SettheweldingpowersourceON/OFFswitchto“I”(unitswitchedon).
9. Selectthefollowingweldingmodeontheuserinterface:MMA
10.Settherequiredweldingparametervaluesontheuserinterface.
 Whentheremotecontroller[RC]isconnectedandtherelativelockingscrewistightened,welding
current can be adjusted using the remote controller.
Thesystemisreadytostartwelding.
REAR VIEW FRONT VIEW
(polarity to basic electrode)
3 4
1
5
2
RC

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2.5 PREPARING FOR TIG WELDING
NOTE: For the cooler to power source assembly procedure refer to the cooler instruction man-
ual.
1. SettheweldingpowersourceON/OFFswitchto“O”(unitswitchedoff).
2. Plugthepowercableplugintoamainssocketoutlet.
3. Connectthegashosefromtheweldinggascylindertothereargassocket.
4. Openthecylindergasvalve.
5. Choosetheelectrodebasedonthetypeofmaterialandthicknessoftheworkpiecetobewelded.
6. Insert the electrode in the TIG torch.
7. Connectthetorchplugtotheweldingsocketonthebasisofthepolarityrequiredbythetypeof
electrode in question.
8. Connecttheplugofthegroundclamptotheweldingsocketonthebasisofthepolarityrequired.
9. Connectthegashosefromtheweldingtorchtothefrontgassocket.
10.ConnecttheweldingtorchconnectortotheTIGtorchsignalsconnector.
11.Connecttheearthclamptotheworkpiecebeingprocessed.
12.SettheweldingpowersourceON/OFFswitchto“I”(unitswitchedon).
13.Selectthefollowingweldingmodeontheuserinterface:TIGDC/TIGAC
14.Pressthetorchtriggerwiththetorchwellclearofanymetalparts.Thisservestoopenthegas
solenoidvalvewithoutstrikingtheweldingarc.
15.Usetheowcontrolvalvetoadjusttheowofgasasrequiredwhilethegasisowingout.
16.Settherequiredweldingparametervaluesontheuserinterface.
 Whentheremotecontrolpedalisconnectedandtherelativelockingscrewistightenedtheweld-
ingcurrentwillvaryinrelationtothepressureexertedonthepedal.
Thesystemisreadytostartwelding.
REAR VIEW FRONT VIEW
(polarity for tungsten electrode)
3 4
1
5
2
RC

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3 COMMISSIONING
3.1 USER INTERFACE
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
CODE SYMBOL DESCRIPTION
L1
STOP
AC
Hz
ThisLEDilluminatestoconrmthepresenceofpowerontheoutputsockets.
L2 STOP
AC
Hz
ThisLEDilluminatestoshowananomalyintheoperatingconditions.
L3 WhenthisLEDilluminatesthefollowingparametercanbeset:SLOPEUP(s)
L4 WhenthisLEDilluminatesthefollowingparametercanbeset:WELDINGCURRENT(A)
L5 WhenthisLEDilluminatesthefollowingparametercanbeset:SECONDCURRENTB-LEVEL
(%)
L6 WhenthisLEDilluminatesthefollowingparametercanbeset:BASECURRENT(A)
L7 SlowpulsedDCTIG: When this LED illuminatesthefollowingparametercanbeset:PEAK
TIME (s)
L8 SlowpulsedDCTIG: When this LED illuminatesthefollowingparametercanbeset:BASE
TIME(s)
L7+L8 FastpulsedDCTIG:WhenthisLEDilluminatesthefollowingparametercanbeset:PULSED
CURRENTFREQUENCY(Hz/kHz)

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CODE SYMBOL DESCRIPTION
L9 WhenthisLEDilluminatesthefollowingparametercanbeset:SLOPEDOWN(s)
L10 WhenthisLEDilluminatesthefollowingparametercanbeset:STARTINGCURRENT(%/A)
L11 WhenthisLEDilluminatesthefollowingparametercanbeset:POST-GAS(s)
L12
STOP
AC
Hz ACTIGmode:WhenthisLEDilluminatesthefollowingparametercanbeset:ACFREQUEN-
CY(Hz)-
L13
STOP
AC
Hz
ACTIGmode:WhenthisLEDilluminatesthefollowingparametercanbeset:ACTIGBAL-
ANCE
L14
STOP
AC
Hz
ACTIGmode:WhenthisLEDilluminatesthefollowingparametercanbeset:ELECTRODE
DIAMETER(mm)
L25
STOP
AC
Hz
This LED indicates that the current reference setting is imposed by the remote controller.
L15
STOP
AC
Hz
Illuminationshowsthatthefollowingfunctionhasbeenactivated:2strokeprocedure.
L16
STOP
AC
Hz
Illuminationshowsthatthefollowingfunctionhasbeenactivated:4strokeprocedure.
L17
STOP
AC
Hz
Illuminationshowsthatthefollowingfunctionhasbeenactivated: 2strokeprocedure+high
frequency arc strike (HF).
L18
STOP
AC
Hz
Illuminationshowsthatthefollowingfunctionhasbeenactivated: 4strokeprocedure+high
frequency arc strike (HF).
L19
STOP
AC
Hz
Illuminationshowsthatthefollowingfunctionhasbeenactivated:4strokeB-levelprocedure+
high frequency arc strike (HF).
L20
STOP
AC
Hz
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:MMA
L21
STOP
AC
Hz
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:TIGDCCONTINU-
OUS
L22
STOP
AC
Hz
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:SLOWPULSEDDC
TIG
L23
STOP
AC
Hz
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:FASTPULSEDDC
TIG
L24
STOP
AC
Hz
ThisLEDilluminatestoshowthatthefollowingweldingmodeisselected:ACTIG
D1
STOP
AC
Hz
Datasetting:Thedisplayshowsthevalueoftheselectedparameter.
Welding:Thedisplayshowstheeffectiveamperesvalueduringwelding.

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CODE SYMBOL DESCRIPTION
S1
STOP
AC
Hz
Pressandrelease:thebuttonenablesthedevicetoreceivetheweldingcurrentcontrolsignal
from a remote controller.
S2
STOP
AC
Hz
Pressandrelease:pressthebuttontoselecttheparametertobeset.
S3
STOP
AC
Hz
This button selects the torch trigger procedure.
S4
STOP
AC
Hz
Thisbuttonselectstheweldingmode.
E1
STOP
AC
Hz
Datasetting:Theencodersetsthevalueoftheselectedparameter.
Welding:Theencodersetsthevalueofthefollowingparameter:WELDINGCURRENT
J1
STOP
AC
Hz
Remote controller connector.
3.2 UNIT POWER-UP
SettheweldingpowersourceON/OFFswitchto“I”toswitchontheunit.
Firstpower-uporpower-upsfollowingaRESETprocedure
Theweldingpowersourcesetsupforweldingwiththefactorypre-sets.
Subsequentpower-ups
Theweldingpowersourcesetsupforweldinginthelateststableweldingcongurationthatwasactive
atthetimeofpower-off.
3.3 RESET (LOAD FACTORY SETTINGS)
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
A A

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Theresetprocedureinvolvescompleterestorationofthedefaultvalues,parametersandmemoryset-
tings set in the factory.
Theresetprocedureisusefulinthefollowingcases:
- Toomanychangesmadetotheweldingparameterssouserndsitdifculttorestoredefaults.
- Unidentiedsoftwareproblemsthatpreventtheweldingpowersourcefromfunctioningcorrectly.
A
○ SettheweldingpowersourceON/OFFswitchto“O”toswitchtheunitoff.
○Keeping both the S2 and S4 buttons pressed, set the generator power source
switchto“I”toturnontheequipment[ SIMULTANEOUS ACTIONS]
3.4 TORCH LOADING
WARNING!
Make sure the torch in use is correctly sized in relation to the welding current required and for the
available and selected cooling type. This prevents the risk of burns to which the operator is potentially
exposed, potential faults, and irreversible damage to the torch and the system.
If a torch is installed or replaced while the unit is running, the circuit of the newly installed torch must
be lled with coolant to avoid the risk of damage to the torch in the case of high voltage arc strikes
without any liquid in the circuit.
3.5 ALARM MANAGEMENT
This LED illuminates if an incorrect operating condition occurs.
Tab. 1 - Alarm messages
MEANING EVENT CHECKS
Overheating alarm
Indicates tripping of the welding
powersourcethermalprotection.
Leavetheunitrunningsothatthe
overheated components cool as
rapidly as possible.
When the unit has cooled, the
welding power source will reset
automatically.
All functions disabled.
Exceptions:
• Cooling fan.
• Cooler(ifswitchedon).
• Makesurethatthepowerrequiredbytheweld-
ing process is lower than the maximum rated
poweroutput.
• Check that the operating conditions are in com-
pliancewiththeweldingpowersourcedataplate
specications.
• Check for the presence of adequate air circula-
tionaroundtheweldingpowersource.

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4 MMA WELDING
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
A
B
SETTING
ACTIVATION
A
○Press the S4 buttontoactivatetheMMAmode.
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
A
L 20 MMA
B○Using theencoder E1 ,editthevalueoftheselectedsetting.Thevalueissavedautomati-
cally.
Tab. 2 - Parameters of the 1st level menu: MMA mode
SETTING MIN DEFAULT MAX
WELDING CURRENT
MAXIMUM CURRENT WITH REMOTE CONTROLLER 7 A 80 A 150 A
- WELDING CURRENT
○ Thisparameterregulatestheprimaryweldingcurrentvalue.
- MAXIMUM CURRENT WITH REMOTE CONTROLLER
○ Themaximumoutputcurrentvaluethatcanbeachievedwithfootpedalcontrollerexternalrefer-
ence.

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5 TIG WELDING
5.1 TIG WELDING - FIRST LEVEL MENU
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
A
C
SETTING
ACTIVATION
B
SELECTION
A
○Press the S4 buttontoactivatetheTIGmode.
STOP
AC
L1 L2 E1
D1
J1 S1 S2 S3 S4
L25
L15
L16
L17
L18
L19
L21
L22
L23
L24
L20
Hz
L12 L13 L14
L3 L6
L4
L5 L7
L8
L9
L10 L11
A
L 21 TIG DC CONTINUOUS
L 22 SLOW PULSED DC TIG
L 23 FAST PULSED DC TIG
L 24 AC TIG
B○Press the S2 button to scroll the list of settings to edit.
L20
L21
L22 L23
L24
L25
L26
L27
L28
L29
C○Using theencoder E1 ,editthevalueoftheselectedsetting.Thevalueissavedautomati-
cally.

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Tab. 3 - Parameters of the 1st level menu: CONTINUOUS DC TIG mode
SETTING MIN DEFAULT MAX
WELDING CURRENT 7 A 80 A 200 A
SECOND CURRENT B-LEVEL
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 50% 200%
DOWN SLOPE 0.0 s 0.0 s 25.0 s
FINAL CURRENT 5 A 5 A 80 A
POST GAS TIME 0.0 s 10.0 s 25.0 s
SLOPE UP 0.0 s 0.0 s 25.0 s
Tab. 4 - Parameters of the 1st level menu: PULSED DC TIG mode
SETTING MIN DEFAULT MAX
WELDING CURRENT 7 A 80 A 200 A
SECOND CURRENT B-LEVEL
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 50% 200%
BASE CURRENT
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 40% 90%
PEAK TIME 0.1 s 0.1 s 5.0 s
BASE TIME 0.1 s 0.1 s 5.0 s
DOWN SLOPE 0.0 s 0.0 s 25.0 s
FINAL CURRENT 5 A 5 A 80 A
POST GAS TIME 0.0 s 10.0 s 25.0 s
SLOPE UP 0.0 s 0.0 s 25.0 s
Tab. 5 - Parameters of the 1st level menu: FAST PULSED DC TIG mode
SETTING MIN DEFAULT MAX
WELDING CURRENT 7 A 80 A 200 A
SECOND CURRENT B-LEVEL
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 50% 200%
BASE CURRENT
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 40% 90%
PULSED CURRENT FREQUENCY 5Hz 100Hz 250Hz
DOWN SLOPE 0.0 s 0.0 s 25.0 s
FINAL CURRENT 5 A 5 A 80 A
POST GAS TIME 0.0 s 10.0 s 25.0 s
SLOPE UP 0.0 s 0.0 s 25.0 s

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Tab. 6 - Parameters of the 1st level menu: AC TIG mode
SETTING MIN DEFAULT MAX
WELDING CURRENT 7 A 80 A 200 A
SECOND CURRENT B-LEVEL
(Thisparameterissetasapercentagereferredtothevalueofthe
followingparameter:WELDINGCURRENT)
10% 50% 200%
DOWN SLOPE 0.0 s 0.0 s 25.0 s
FINAL CURRENT 5 A 5 A 80 A
POST GAS TIME 0.0 s 10.0 s 25.0 s
AC FREQUENCY 20Hz 64Hz 208Hz
AC BALANCE - 11 0 15
ELECTRODE DIAMETER 1,0 mm 2,4 mm 3,2 mm
SLOPE UP 0.0 s 0.0 s 25.0 s
Forabetterunderstandingoftheparameterfunctionsdescribedinthetable,refertothefollowingdia-
gram.
(I1) WELDING CURRENT
(I2) BASE CURRENT
(I3) FINAL CURRENT
(t1) UP SLOPE TIME
(t2) PEAK TIME
(t3) BASE TIME
(1/t2+t3) PULSED FREQUENCY
(t4) DOWN SLOPE TIME
(t5) PRE GAS TIME
(t6) POST GAS TIME
- WELDING CURRENT
○ Thisparameterregulatestheprimaryweldingcurrentvalue.
- MAXIMUM CURRENT WITH REMOTE CONTROLLER
○ Maximumoutputcurrentvaluethatcanbeachievedwithremotecontrollerexternalreference.
- SLOPE UP
○ Timeduringwhichthecurrentchangesfromthestartingvaluetotheweldingvaluebymeansof
a slope.
○ Thissettingisusedtoavoiddamagingtheedgesofthejointwithexcessivelyhighcurrentvalues
atthemomentofarcstriking.Thevalueofthemainweldingcurrentisincreasedgraduallyinorder
tocontroltheuniformityofmaterialdepositionandweldpenetration.
- SECOND CURRENT B-LEVEL
○ Witharapidpressandrelease(lessthan0.5seconds)ofthetorchtriggerduringwelding,theout-
putcurrentvalueswitchestothevaluesetbymeansofthe“B-levelsecondcurrent”parameter.
○ Thisfunctionmakesitpossibletoavoidinterruptingtheweldingprocesswhenthegeometryof
theworkpiecechanges;alternatively,theweldingcurrentcanbereducedtodecreaseheatingof
thepartifitbecomestoohotduringexecutionoftheweldingprocess.
○ InDCTIGwelding,theparameterisusefulwhenweldingdifferentgaugeworkpiecesduringthe
samepass;whenmovingbetweendifferentgaugestheoutputcurrentcanbechangedsimplyby
pressing the torch trigger.

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- BASE CURRENT
○ Pulsedwaveminimumcurrent.
- Consequences of a higher value:
• -Fastercreationofweldpool.
• -Increaseofheat-affectedzone.
- PEAK TIME
○ Timeforwhichthecurrentpulseisatthemaximumvalue.
-Consequences of a higher value:
• -Greaterwidthofthebeadingandgreaterweldingpenetration.
• - Facility to make deeper cuts.
- Consequences of a lower value:
• -Reductionofthebeadandofheat-affectedzone.
• -Difculttocreateaweldpool.
- PULSED CURRENT FREQUENCY
○ Thegreaterthefrequency,thetighterthebeadweldingandgreatertheweldingtime.Increasing
thefrequency,restrictstheheataffectedzone.
- Consequences of a higher value:
• -Slowermeltspeed.
• -Reductionofheat-affectedzone.
- BASE TIME
○ Timeduringwhichcurrentoutputisatthebasevalue.
- Consequences of a higher value:
• -Thellermaterialisspreadmoreevenly.
• -Increaseofheat-affectedzone.
- DOWN SLOPE
○ Timeduringwhichthecurrentchangesfromtheweldingvaluetotheendvaluebymeansofa
slope.Preventstheformationofcratersintheprocessofturningoffthearc.
- FINAL CURRENT
○ Duringelectrodeweldingtheparametermakesitpossibletoobtainauniformdepositofllerma-
terialfromthestarttotheendoftheweldingprocess,closingthedepositioncraterwithacurrent
suchastodepositanaldropletofllermaterial.
○ Bykeepingthetorchtriggerpressedduringthe3rdtime,thecraterllercurrentismaintained
therebyensuringoptimalcraterlling,untilthepostgastimeisstartedbyreleasingthetorchtrig-
ger (4th time).
- POST GAS TIME
○ Timeofpostgasdeliverywhentheweldingarcisextinguished.
- Consequences of a higher value:
• Moreeffectivepickling(improvedappearanceofworkpieceattheendoftheweldingpass).
• - Higher gas consumption.
- Consequences of a lower value:
• -Lowergasconsumption.
• -Oxidationofelectrodetip(moredifcultarcstrike).
- STARTING CURRENT
○ Unitcurrentoutput value immediately afterthearcstrike.Thevalue of thisparametercanbe

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setasapercentageoftheweldingcurrentorasanabsolutevalueexpressedinAmperes.The
parameterisdisplayedbutitisnotusedduringtheweldingprocesswhenthefollowingsettingis
present:MULTITACK=ONTheusefulnessofhavinganadjustableinitialweldingcurrentisthat
ofavoidingweldingthepartwithexcessivelyhighcurrentvaluesandthuspotentiallydamagingit.
Particularlyusefulwhenweldingthinsheets.
- AC INVERSION FREQUENCY
○ ThefrequencyinTIGACisthenumberofinversionsbyDC+toDC-asaunitoftime(T1)and
adjustedinHertz(Hz).Thereductioninthefrequencyvalueoftheelectricarcinversiontendsto
widenitssize,thereforeitisadvisabletouselowfrequenciesfortheweldingofrelativelylarge
thicknessesorforllingpassesinmultipassbevels.Conversely,inincreasingtheinversionfre-
quencyvalue,thearcsizetendstodecreaseandthereforeincreasestheconcentrationofthe
poolandtheprecisionofthewelding.Itisthereforeadvisabletousehighvaluesoffrequencyfor
theweldingofverythinthicknessorforfacingsonedgesofmoulds
- Consequences of a higher value:
• Arc concentration.
• Reductionofheat-affectedzone.
• Slowermeltspeed.
INVERSION FREQUENCY
LOW FREQUENCY (s)
T1(s)
T1 (s)
HIGH FREQUENCY (s)
T1 (s)
- AC BALANCE
○ This parameter establishes the positive wave vs. negative wave time ratio.
ThefollowinggureshowsgraphswithwaveswithdifferentACbalancevalues:“0”BALANCE
representstheoptimumratiobetween“CleanlinessandPenetration”.“+”BALANCErepresents
thecurveofthecurrentcurvewithanACBalancewithapositivevalue(cleaner);inthiscasethe
percentageofthepositivewaveisgreaterthanthenegativeone.“-”BALANCErepresentsthe
curveofthecurrentwithanegativevalueACbalance(morepenetration)inwhichitcanbeseen
thatthereisalowpercentageofpositivewavewhencomparedwiththenegative.
- Consequences of a higher value:
• Greaterweldpenetration.
• Less cleanliness.

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AC BALANCE
BALANCE 0 (s)
DC+ (35%) DC- (65%)
BALANCE+ (s)
DC+ (50%) DC- (50%)
BALANCE - (s)
DC+ (20%) DC- (80%)
- ELECTRODE DIAMETER
○ TheparameteroptimizestheACTIGweldingarcstrikeonthebasisofthediameterofthechosen
electrode.