1 Copyright  2004 Lincoln Global Inc. GAS METAL ARC WELDING GMAW(MIG/MAG)

2 Copyright  2004 Lincoln Global Inc. Gas Metal Arc Welding Principles of the GMAW Process

3 Copyright  2004 Lincoln Global Inc. Principles of the GMAW Process

4 Copyright  2004 Lincoln Global Inc. Equipment Components Constant Voltage (CV) Power Source or Constant Current (CC) Power SourceConstant Voltage (CV) Power Source or Constant Current (CC) Power Source Constant Speed Wire FeederConstant Speed Wire Feeder Gun and CablesGun and Cables Shielding Gas Kit and Gas CylinderShielding Gas Kit and Gas Cylinder Consumable Wire ElectrodeConsumable Wire Electrode

5 Copyright  2004 Lincoln Global Inc. Constant Voltage Welding Circuit Consists of Power Source, Wire Feeder, and Work and Electrode Cables/LeadsWelding Circuit Consists of Power Source, Wire Feeder, and Work and Electrode Cables/Leads Voltage is Proportional to Arc LengthVoltage is Proportional to Arc Length Current Changes Dramatically to Maintain Constant Arc LengthCurrent Changes Dramatically to Maintain Constant Arc Length

6 Copyright  2004 Lincoln Global Inc. Constant Current Welding Circuit Consists of Power Source, Voltage Sensing Wire Feeder, Work and Electrode Cables/LeadsWelding Circuit Consists of Power Source, Voltage Sensing Wire Feeder, Work and Electrode Cables/Leads Voltage is Proportional to Arc LengthVoltage is Proportional to Arc Length Current Remains Constant Even for Changes in Voltage Due to Changes in Arc LengthCurrent Remains Constant Even for Changes in Voltage Due to Changes in Arc Length

7 Copyright  2004 Lincoln Global Inc. Duty Cycle The Duty Cycle of a power source is the percentage of a ten (10) minute period that it can operate at the rated output current setting.

8 Copyright  2004 Lincoln Global Inc. Duty Cycle Duty CycleAmperes Time Available Available 30% Min/10 Min 30% Min/10 Min 40% Min/10 Min 40% Min/10 Min 50% Min/10 Min 50% Min/10 Min 60% Min/10 Min 60% Min/10 Min 70% Min/10 Min 70% Min/10 Min 80% Min/10 Min 80% Min/10 Min 90% Min/10 Min 90% Min/10 Min 100% Min/10 Min 100% Min/10 Min

9 Copyright  2004 Lincoln Global Inc. Inductance Control “Fine Adjustment” Controls Arc Characteristics“Fine Adjustment” Controls Arc Characteristics Determines the Rate at Which the Amperage Rises When a Short Circuit is ProducedDetermines the Rate at Which the Amperage Rises When a Short Circuit is Produced Also Called Pinch or Arc ControlAlso Called Pinch or Arc Control Max. Pinch = Min. InductanceMax. Pinch = Min. Inductance Min. Pinch = Max. InductanceMin. Pinch = Max. Inductance

10 Copyright  2004 Lincoln Global Inc. Max. Inductance vs. Min. Inductance Thicker MaterialsThicker Materials Deeper PenetrationDeeper Penetration More Fluid Weld PoolMore Fluid Weld Pool Flatter / Smoother WeldFlatter / Smoother Weld Reduce SpatterReduce Spatter Stainless SteelsStainless Steels Thin MaterialsThin Materials Arc Stability On Open GapsArc Stability On Open Gaps Convex Weld BeadConvex Weld Bead Increased SpatterIncreased Spatter Colder ArcColder Arc Improved Weld Pool ControlImproved Weld Pool Control

11 Copyright  2004 Lincoln Global Inc. Welding Guns 100 Through 550 Amp GMAW Gun and Cables

12 Copyright  2004 Lincoln Global Inc. 300 and 500 Amp Work Clamps GC 300 GC 500 Work Clamps

13 Copyright  2004 Lincoln Global Inc. Cables

14 Flowmeter Flowgauge Harris Calorific Equipment Shielding Gas Kit with Hose

15 Copyright  2004 Lincoln Global Inc. The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment and consumables, and cutting equipment. Our challenge is to meet the needs of our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond to our customers based on the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such information or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customer’s particular purpose, with respect to such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter any warranty with respect to the sale of our products. Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility of, the customer. Customer Assistance Policy