Hobart 180 SD manual Selecting and Preparing Tungsten Electrode, Selecting Tungsten Electrode

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SECTION 7 – SELECTING AND PREPARING

TUNGSTEN ELECTRODE

gtaw2 7/97

NOTE

For additional information, see your distributor for a handbook on the Gas Tungsten Arc Welding (GTAW) process. Wear clean gloves to prevent contamination of tungsten electrode.

7-1. Selecting Tungsten Electrode

	Amperage Range - Gas Type♦ - Polarity

Electrode Diameter	DC – Argon – Electrode Negative/Straight	DC – Argon – Electrode Positive/Reverse
	Polarity	Polarity

2% Thorium Alloyed Tungsten (Red
Band)

.010”	Up to 25	*
.020”	15-40	*
.040”	25-85	*
1/16”	50-160	10-20
3/32”	135-235	15-30
1/8”	250-400	25-40
5/32”	400-500	40-55
3/16”	500-750	55-80
1/4”	750-1000	80-125

♦Typical argon shielding gas flow rates are 15 to 35 cfh (cubic feet per hour) – 7 to 16.5 lpm (liters per minute). *Not Recommended.

The figures listed are intended as a guide and are a composite of recommendations from American Welding Society (AWS) and electrode manufacturers.

7-2. Safety Information About Tungsten

Y Grinding the tungsten elec-

		trode produces dust and fly-
		ing sparks which can cause
	1	injury and start fires. Use lo-
		cal exhaust (forced ventila-

		tion) at the grinder or wear an
		approved respirator. Read
		MSDS for safety information.
		Consider	using	tungsten
		containing ceria,		lanthana,
		or yttria	instead of thoria.
		Grinding dust from thoriated
	2	electrodes contains low-lev-
		el radioactive		material.

		Properly dispose of grinder
		dust in an environmentally
		safe way. Wear proper face,
		hand, and body protection.
		Keep flammables away.
	1	Tungsten Electrode With
		Balled End
	2	Pointed Tungsten Electrode

Ref. S-0161

OM-355 Page 22

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Contents Description OM-355Processes From Hobart to You Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killPrincipal Safety Standards EMF Information About PacemakersUN Choc É Lectrique peut tuer Signification des symbolesConsignes DE Securite Lire Avant Utilisation 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 ’EMPLOI Excessif peut Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques Selecting a Location InstallationIncluded with Your Unit MovementDuty Cycle Chart Dimensions And WeightsSpecifications ARC Welding can cause Electromagnetic Interference Volt-Ampere CurvesWeld Output Terminals And Selecting Cable Sizes Socket Remote 14 ReceptacleShielding Gas Connections Necting to receptacleInput Voltage Electrical Service GuideConnecting Input Power Input Amperes at Rated OutputControls Output Selector SwitchOperation Select weld process Select polarity Select amperage Example Connect remote control see Section OM-355Example of Remote Amperage Control For TIG Gtaw Welding Select weld process Select polarityRemote Foot Control Typical TIG ConnectionsTypical Stick Connections ApplicationProcess and Material Thickness Guide Label Maintenance and TroubleshootingRoutine Maintenance Turn Off power before ad Adjusting Spark GapsTroubleshooting Justing spark gapsElectrical Diagram Circuit Diagram For Welding Power SourceHigh Frequency HF Welding Processes Using HFSources Of HF Radiation From Incorrect Installation Nonmetal Correct InstallationGround Wire Building Metal BuildingSelecting Tungsten Electrode Safety Information About TungstenSelecting and Preparing Tungsten Electrode Preparing Tungsten For DC Electrode Negative Dcen Welding Instead of thoriated. Tho Guidelines for TIG Welding GtawPositioning The Torch Mables awayWelding direction Form pool Tilt torch Torch Movement During WeldingTungsten Without Filler Rod Tungsten With Filler RodPositioning Torch Tungsten For Various Weld Joints Butt Weld And Stringer Bead Joint Lap Joint Corner JointOM-355 Stick Welding Smaw Guidelines Stick Welding ProcedureWeld current starts when electrode touches work- piece Striking an Arc Tapping Technique Electrode and Amperage Selection ChartStriking an Arc Scratch Start Technique Positioning Electrode Holder Poor Weld Bead CharacteristicsGood Weld Bead Characteristics 9090 End View of Work AngleConditions That Affect Weld Bead Shape Electrode Movement During WeldingTee Joint Butt JointsLap Joint 16 in 1.6 mm Tack WeldsWeld Test Troubleshooting PorosityTroubleshooting Excessive Spatter Possible Causes Corrective ActionsTroubleshooting Excessive Penetration Troubleshooting Incomplete FusionTroubleshooting Lack Of Penetration Troubleshooting Distortion Troubleshooting Burn-ThroughTroubleshooting Waviness Of Bead Parts List Main AssemblyDia Part Description Quantity Mkgs 043 Panel, Front w/Components Page Page Page Service SupportCall Contact your Distributor forHobart Welding Products