Hobart Welding Products OM-950 manual Striking An Arc, Positioning The Electrode Holder

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8-3. Striking An Arc

Scratch Start Technique

Tap Start Technique

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

8-4. 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-950 Page 25

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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 About Pacemakers Principal Safety StandardsEMF Information Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux 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 sécuritéManufacturer’s Rating Labels Symbols And Definitions− Definitions Specifications − InstallationAC/DC Models AC ModelsFor AC/DC Models Duty Cycle ChartsFor 235/160A Models For AC ModelsVolt-Ampere Curves For AC Models For 235A Models Selecting a LocationInstalling Electrode Cable and Barrel Installing Electrode Holder And Work ClampHolder or work clamp Onto Electrode HolderWeld Output Cables Electrical Service Guide50/60 Hz Input Voltage 230 Input Amperes At Rated OutputOut input power before instal Connecting Input Power=GND/PE Earth Groundbe sure to supply correct in- put power Disconnect and lockout/tagControls − OperationControls For AC/DC Models For DC Weld OutputControls For AC Models Routine Maintenance − Maintenance & TroubleshootingLubricating Shunt Block And Anti-Noise Adjustment MonthsReinstalling Amperage Adjustment Indicator Trouble Remedy Troubleshooting Circuit Diagram For AC 230 Volts Models Circuit Diagram For AC/DC 230 Volts ModelsWelding 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 PorosityLack Of Penetration Excessive SpatterIncomplete Fusion Burn-Through Excessive PenetrationWaviness Of Bead DistortionStart Your Professional Welding Career Now Main Assembly AC/DC model illustrated − Parts ListMain Assembly Page Assistance ServiceSupport Hobart Welding Products Contact your Distributor for