Hobart Welding Products OM-949 manual Welding Methods & Troubleshooting

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SECTION 7 − WELDING METHODS & TROUBLESHOOTING

mod5.1* 9/92

A. Welding Methods

7-1. Shielded Metal Arc Welding (SMAW) Procedure

1 7

Tools Needed:

ST-151 593

1 Workpiece

Make sure workpiece is clean before welding.

2 Work Clamp

Place as close to the weld as possible.

3 Electrode

A small diameter electrode requires less current than a large one. Follow recommendations of electrode manufacturer when setting weld amperage (see 7-2).

4 Insulated Electrode Holder

5Electrode Holder Position

6Arc Length

Arc length is the distance from the electrode to the workpiece. A short arc with correct amperage will give a sharp, crackling sound.

YWelding current starts as soon as electrode touches the workpiece.

7 Slag

Use a chipping hammer and wire brush to remove slag. Remove slag and check weld bead before making another weld pass.

OM-949 Page 19

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Contents Description ProcessesFrom 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 eyesCalifornia 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 DES Pièces Chaudes peuvent provoquer des brûlures graves LE Soudage peut provoquer unIncendie ou une explosion DES Particules Volantes peuvent blesser les yeuxDES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut SUREn ce qui concerne les stimulateurs cardiaques Principales normes de sécuritéDuty Cycle Charts SpecificationsAmps Volt-Ampere CurvesSelecting a Location Volt ModelRemoving Barrel From Elec- trode Holder Installing Electrode Holder And Work ClampInstalling Electrode Cable and Barrel onto Electrode Holder Installing Work Cable onto Work ClampPut terminals Weld Output Cables150 ft 200 ft 250 ft 350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 mConnecting Input Power Electrical Service GuideControls Months Routine MaintenanceLubricating Shunt Block And Anti-Noise Adjustment 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 ArcArc Length Weld Bead CharacteristicsConditions That Affect Weld Bead Shape Electrode AngleButt Joints Electrode Movement During WeldingPorosity Welding TroubleshootingLap Joints Tee JointsLack Of Penetration Excessive SpatterIncomplete Fusion Distortion Excessive PenetrationBurn-Through Waviness Of BeadStart Your Professional Welding Career Now − Parts List Dia Part Description Quantity Page Assistance ServiceSupport Hobart Welding Products Contact your Distributor for