Hobart 180 SD manual Preparing Tungsten For DC Electrode Negative Dcen Welding

Page 27

7-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding

 

 

1

Tungsten Electrode

1

2

2

Tapered End

 

 

Grind end of tungsten on fine grit,

 

 

hard abrasive wheel before weld-

 

 

ing. Do not use wheel for other jobs

 

 

or tungsten can become contami-

 

 

nated causing lower weld quality.

 

2-1/2 Times

 

 

 

Electrode Diameter

 

 

 

 

1

Stable Arc

 

1

2

Flat

 

Diameter of this flat determines

 

 

 

2

amperage capacity.

 

3

Grinding Wheel

 

 

 

3

4

Straight Ground

 

4

 

 

Ideal Tungsten Preparation – Stable Arc

 

 

 

 

1

Arc Wander

 

1

2

Point

 

3

Grinding Wheel

 

 

 

 

4

Radial Ground

 

2

 

 

 

3

 

 

4

Wrong Tungsten Preparation – Wandering Arc

Ref. S-0161 / Ref. S-0162

OM-355 Page 23

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Contents OM-355 ProcessesDescription From Hobart to You Table of Contents Page Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding HazardsBuildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyesPrincipal Safety Standards About Pacemakers EMF InformationLES Fumé ES ET LES GAZ peuvent ê tre dangereux Signification des symbolesConsignes DE Securite Lire Avant Utilisation UN Choc É Lectrique peut tuerLE Soudage peut provoquer un incendie ou une explosion DES Particules Volantes peuvent blesser les yeuxLE Bruit peut affecter l’ouïe DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peutPrincipales normes de sé curité Information sur les champs é lectromagné tiquesConsignes relatives aux stimulateurs cardiaques Movement InstallationIncluded with Your Unit Selecting a LocationDimensions And Weights SpecificationsDuty Cycle Chart Volt-Ampere Curves Weld Output Terminals And Selecting Cable SizesARC Welding can cause Electromagnetic Interference Necting to receptacle Remote 14 ReceptacleShielding Gas Connections SocketInput Amperes at Rated Output Electrical Service GuideConnecting Input Power Input VoltageOutput Selector Switch OperationControls Select weld process Select polarity Connect remote control see Section OM-355Example of Remote Amperage Control For TIG Gtaw Welding Select weld process Select polarity Select amperage ExampleApplication Typical TIG ConnectionsTypical Stick Connections Remote Foot ControlMaintenance and Troubleshooting Routine MaintenanceProcess and Material Thickness Guide Label Justing spark gaps Adjusting Spark GapsTroubleshooting Turn Off power before adCircuit Diagram For Welding Power Source Electrical DiagramWelding Processes Using HF Sources Of HF Radiation From Incorrect InstallationHigh Frequency HF Building Metal Building Correct InstallationGround Wire NonmetalSafety Information About Tungsten Selecting and Preparing Tungsten ElectrodeSelecting Tungsten Electrode Preparing Tungsten For DC Electrode Negative Dcen Welding Mables away Guidelines for TIG Welding GtawPositioning The Torch Instead of thoriated. ThoTungsten With Filler Rod Torch Movement During WeldingTungsten Without Filler Rod Welding direction Form pool Tilt torchButt Weld And Stringer Bead Joint Lap Joint Corner Joint Positioning Torch Tungsten For Various Weld JointsOM-355 Stick Welding Procedure Weld current starts when electrode touches work- pieceStick Welding Smaw Guidelines Electrode and Amperage Selection Chart Striking an Arc Scratch Start TechniqueStriking an Arc Tapping Technique 9090 End View of Work Angle Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Positioning Electrode HolderElectrode Movement During Welding Conditions That Affect Weld Bead Shape16 in 1.6 mm Tack Welds Butt JointsLap Joint Tee JointPossible Causes Corrective Actions Troubleshooting PorosityTroubleshooting Excessive Spatter Weld TestTroubleshooting Incomplete Fusion Troubleshooting Lack Of PenetrationTroubleshooting Excessive Penetration Troubleshooting Burn-Through Troubleshooting Waviness Of BeadTroubleshooting Distortion Main Assembly Parts ListDia Part Description Quantity Mkgs 043 Panel, Front w/Components Page Page Page Support ServiceContact your Distributor for Hobart Welding ProductsCall
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