Lincoln Electric IM366-B Machine Setup for the Gmaw MIG Process, Correct Way to Strike an Arc

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MACHINE SETUP FOR THE GMAW (MIG) PROCESS

1.See “Recommended Processes and Equipment” for selection of welding wire and shielding gas and for range of metal thicknesses that can be welded.

2.See the “Welding ” chart on the inside of wire feed section door or in this manual for information on setting the controls.

3.Set the “Voltage” and “Wire Speed” controls to the settings suggested for the welding wire and base metal thickness being used. The voltage control is marked “V” and the wire feed speed is marked olo.

4.Check that the polarity is correct for the welding wire being used. Set the polarity for DC(+) when welding with the GMAW (MIG) process. (See page 9 of the Installation Instructions on how to make output polarity connections.)

5.Check that the gas nozzle and proper size liner and contact tip are being used, and that the gas supply is turned on. If adjustable, set for 15 to 20 cubic feet per hour (7 to 10 liters/min) under normal con- ditions; increase as high as 35 CFH (17 liters/min) under drafty (slightly windy) conditions.

NOTE: The gas regulators included in the optional K463 and K499 kits are preset and nonadjustable.

6.Connect work clamp to metal to be welded. Work clamp must make good electrical contact to the workpiece. The workpiece must also be grounded as stated in “Arc Welding Safety Precautions.”

WELDING TECHNIQUES FOR THE GMAW (MIG) PROCESS

The welding techniques for the GMAW (MIG) process on light gauge material are basically the same as welding with .035" (0.9 mm) NR-211-MP Innershield electrode. (Review welding techniques in the self- shielded FCAW Innershield section on page 14.) The few exceptions are noted below.

The Correct Welding Position

When using the GMAW process on light gauge mater- ial, weld from right to left (if right handed) pushing the electrode ahead of the arc (see figure following). This technique results in a colder weld and has less ten- dency for burnthrough. You may weld in the opposite direction as long as you are obtaining desirable results.

Push Technique

The Correct Way to Strike an Arc

1.The arc is struck the same as for self-shielded FCAW welding. However, for easier restrikes, the ball at the tip end of the wire which forms after com- pleting a weld may be removed with wire cutters.

2.When no more welding is to be done, don’t forget to first close valve on gas cylinder (if used), momentarily

operate gun trigger to release gas pressure, then turn off the machine.

The Correct Electrical Stickout

The electrical stickout (ESO) for GMAW (MIG) weld- ing is 3/8 to 1/2 inch (10 to 12 mm). The same rules apply as when welding with .035" (0.9 mm) NR-211-MP Innershield wire.

The Correct Welding Speed

The same rules apply as those for self-shielded FCAW welding. At first, it may be more difficult to judge speed since no slag is forming behind the molten pool. Watch the ridge where the molten puddle solidifies.

Practice

To practice your GMAW (MIG) welding skills, use the following:

Mild steel

16 gauge (about 1/16 inch)

Electrode

Lincolnweld® .025 L-56 electrode

Shielding gas

CO2

Voltage setting “V”

G

Wire feed speed olo

5

Then follow the instructions in the practice section on self-shielded FCAW welding.

WELDING PROCEDURES

When GMAW (MIG) welding on sheet metal, remem- ber to use the “forehand” push technique, and review the welding procedures section on self-shielded FCAW Innershield welding.

Welding in the Vertical Position

One variation of welding procedure is welding in the vertical-up position. When welding in the vertical-up position, use the proper gun angle shown below.

Gun angle for the GMAW process welding in the vertical-up position.

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Contents SP-100 Electric Shock can kill Cylinder may explode if damaged Précautions DE Sûreté Sûreté Pour Soudage a L’ArcTable of Contents Explanation of Symbols That Appear on this Equipment Please Examine Carton and Equipment For Damage ImmediatelyRecommended Processes and Equipment Optional AccessoriesProduct Description Installation Safety PrecautionsUnpacking the SP-100 K462 Type K462Work Cable and Clamp Installation Work Clamp InstallationDescription of Controls LocationGUN Installation Wire Feed Drive RollWelding Wire Loading Work Cable InstallationRequirements for CSA Rated Output Electrical Input ConnectionCode Requirements Optional Accessories Installation Shielding GASSelecting a Wire Spool Size Feeding Welding WireOperating Instructions Duty CycleMaking a Weld Wire Feed Overload ProtectionOverload Protection Shutdown SELF-SHIELDED Fcaw Welding ARC Learning to WeldARC-WELDING Circuit Correct Welding Position Machine SET UP for the SELF- Shielded Fcaw ProcessWelding Techniques for the SELF- Shielded Fcaw Process Common Metals Correct Electrical StickoutCorrect Welding Speed Helpful HintsWelding in the Vertical Position Welding ProceduresTypes of Welds Gmaw MIG Welding ARC Process SelectionMachine Setup for the Gmaw MIG Process Welding Techniques for the Gmaw MIG ProcessCorrect Way to Strike an Arc Welding in the Vertical PositionTroubleshooting Welds Proper GUN HandlingTo Eliminate a Ropey Convex Bead in order To Correct Poor Penetration in order of importanceRoutine Maintenance Electric Shock can killLiner trim length for the Magnum 100L gun. red trigger General Troubleshooting Guide Problem Possible Cause What To DoPage SP 100 Wiring Diagram Page How To Read Shop Drawings $700.00Ground Fuera del área de trabajo CuerpoInflammable Votre corps PerschutzKeep your head out of fumes Guards offUse ventilation or exhaust to Desconectar el cable de ali No operar con panel abierto oStatement of Warranty To Obtain Warranty Coverage Warranty RepairWarranty Period Warranty Costs
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