Hobart Welding Products 350LX manual Balance/DIG Control, Preflow Time Control

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4-9. Balance/DIG Control

(CE Nameplate Only)

1

1

 

Balance Control Examples

Setting

Output Waveforms

Arc

Balanced

50% Electrode

 

3

Positive

 

 

50% Electrode

 

 

Negative

 

More Penetration

32% Electrode

 

 

 

 

Positive

 

 

68% Electrode

 

10

Negative

 

More Cleaning

55% Electrode

 

 

 

 

Positive

 

 

45% Electrode

 

0

Negative

 

 

 

1 Balance/DIG Control

Balance Control (AC GTAW):

Control changes the AC output square wave. Rotating the control towards 10 provides deeper pene- tration. Rotating the control towards 0 provides more cleaning action of the workpiece.

When the control is in the Balanced position, the wave shape provides equal penetration and cleaning action.

Application:

When welding on oxide forming ma- terials such as aluminum or magne- sium, excess cleaning is not neces- sary. To produce a good weld, only a minimal amount, approximately a

0.10in (2.5mm) of etched zone along the weld toes is required.

Set control to 7 and adjust as nec- essary. Joint configuration, set-up, process variables, and oxide thick- ness may affect setting.

Arc rectification can occur when welding above 200 amps and/or while welding with helium gas. If this condition occurs, increasing the Balance control towards maximum penetration, may help to restabilize the arc.

DIG Control (AC And DC SMAW):

When set at 0, short-circuit amper- age at low arc voltage is the same as normal welding amperage.

When setting is increased, short- circuit amperage at low arc voltage increases.

Application:

Control helps arc starting or making vertical or overhead welds by in- creasing amperage at low arc volt- age, and reduces electrode sticking while welding.

Ref. S-0795-A

4-10. Preflow Time Control

(CE Nameplate Only)

1

1

1 Preflow Time Control

Use control to set length of time that gas flows (0–10 seconds) before arc starts.

Application:

Preflow is used to purge the imme- diate weld area of atmosphere. Pre- flow also aids in consistent arc starting.

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Contents Description OM-356188694JProcesses From Hobart to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killPrincipal Safety Standards About Pacemakers EMF InformationConsignes DE Securite Lire Avant Utilisation Signification des symbolesUN Choc É Lectrique peut tuer LES Fumé ES ET LES GAZ peuvent ê tre dangereuxLE Bruit peut affecter l’ouïe LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux LA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU’EMPLOI Excessif peut DES Organes Mobiles peuvent provoquer des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques Keep your head out of the fumes Disconnect input plug or power before working on machineDefinitions Manufacturer’s Rating Label For CE Products Symbols And Definitions Selecting a Location InstallationMovement Falling Unit Can Cause Injury Location And AirflowSpecifications Dimensions And WeightsVolt-Ampere Curves Duty Cycle And OverheatingMinutes Welding Minutes Resting OverheatingRemote 14 Receptacle Weld Output Terminals And Selecting Cable SizesARC Welding can cause Electromagnetic Interference TerminalsNecting to receptacle Turn Off power before conElectrical Service Guide Close and secure primary door Placing Jumper Links And Connecting Input PowerControls OperationFor 200/230/460 Volts And Non CE Units Pulse ControlsFor CE Units Process Control Output Selector SwitchOutput Selector Switch Output Control Current ControlWhen Lift-Arc is selected, start arc as follows Start ModeWhen HF Start is selected, start arc as follows When HF Continuous is selected, start arc as followsMeters Amperage Adjustment ControlPreflow Time Control Balance/DIG ControlPostflow Time Control Percent % Peak Setting Pulse Controls50% Bkg AmpOptional Sequence Controls High Frequency ControlStart Time/Spot Time Control And Start Current Control Sequence Selection SwitchCrater Time Control And Final Current Control Start/Crater Sequence Controls Sequence Selection Controls Start Sequence Switch 4T PositionSpot Time Control Timer/Cycle CounterRoutine Maintenance Maintenance & TroubleshootingDisconnect power before maintaining MonthsTools Needed 012 in 0.305 mm Adjusting Spark GapsTurn Off power before adjusting spark gaps Help 4 Display Voltmeter/Ammeter Help DisplaysHelp 3 Display Indicates the transformer of the unit has There are not user serviceable parts inside unit TroubleshootingProtect against overheating Check for water in torch, and repair torch if necessaryFan not operating Circuit Diagram Electrical DiagramHigh Frequency Incorrect InstallationWelding Processes Requiring High Frequency Weld ZoneNonmetal Building Ground workpiece if required by codes Correct InstallationMetal Building Metal Building RequirementsMain Assembly Parts ListTRANSFORMER/STABILIZER Assembly 200/230/460 Optional 185 Switch, Push Button -1 ItemPage Support ServiceCall Contact your Distributor forHobart Welding Products