Hobart Welding Products OM-949 manual Striking An Arc, Positioning The Electrode Holder

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7-3. Striking An Arc

Scratch Start Technique

1

2

3

Tap Start Technique

1

2

3

1Electrode

2Workpiece

3Arc

Drag electrode across workpiece like striking a match; lift electrode slightly after touching work. If arc goes out electrode was lifted to high. If electrode sticks to work- piece, use a quick twist to free it.

Bring electrode straight down to workpiece; then lift slightly to start arc. If arc goes out, electrode was lifted too high. If electrode sticks to workpiece, use a quick twist to free it.

S-0049 / S-0050

7-4. Positioning The Electrode Holder

		10°−30°	Groove Welds
			Groove Welds
90°	90°
End View Of Work Angle		Side View Of Electrode Angle
			Fillet Welds
	45°	10°−30°
	45°
45°
End View Of Work Angle		Side View Of Electrode Angle
			S-0660
			OM-949 Page 21

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Contents Description ProcessesFrom 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 killCalifornia Proposition 65 Warnings EMF Information Principal Safety StandardsAbout Pacemakers LES Fumées ET LES GAZ peuvent être dangereux UNE Décharge Électrique peut entraîner la mortIndique un message de sécurité particulier Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Principales normes de sécuritéDuty Cycle Charts SpecificationsSelecting a Location Volt-Ampere CurvesVolt Model AmpsInstalling Electrode Cable and Barrel onto Electrode Holder Installing Electrode Holder And Work ClampInstalling Work Cable onto Work Clamp Removing Barrel From Elec- trode Holder150 ft 200 ft 250 ft Weld Output Cables350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Put terminalsConnecting Input Power Electrical Service GuideControls Lubricating Shunt Block And Anti-Noise Adjustment Routine MaintenanceMonths Wrapper Remove wrapper from unit Crank Handle Shunt Shaft Reinstalling Amperage Adjustment IndicatorTrouble Remedy Troubleshooting− Electrical Diagrams Welding Methods Shielded Metal Arc Welding Smaw Procedure − Welding Methods & Troubleshooting6013 7014 Electrode And Amperage Selection ChartPositioning The Electrode Holder Striking An ArcConditions That Affect Weld Bead Shape Weld Bead CharacteristicsElectrode Angle Arc LengthButt Joints Electrode Movement During WeldingLap Joints Welding TroubleshootingTee Joints PorosityIncomplete Fusion Excessive SpatterLack Of Penetration Burn-Through Excessive PenetrationWaviness Of Bead DistortionStart Your Professional Welding Career Now − Parts List Dia Part Description Quantity Page Support ServiceAssistance Hobart Welding Products Contact your Distributor for