Lincoln Electric IM536-D manual Shielding Gas, Making a Weld

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OPERATION

 

 

B-5

 

 

 

 

 

 

FIGURE B.5

 

FIGURE B.6

 

 

 

 

 

 

 

 

Gun Handle

Contact Tip

Gas Diffuser

 

Contact Tip

Wire Electrode

 

Gas Nozzle

3/8" – 1/2" Electrical Stickout

 

Shielding Gas

When using the GMAW process, a cylinder of shield- ing gas, must be obtained. Refer to the ACCES- SORIES section for more information about selecting gas cylinders for use with the SP-125 Plus.

1.For CO2, open the cylinder very slowly. For argon- mixed gas, open cylinder valve slowly a fraction of a turn. When the cylinder pressure gauge pointer stops moving, open the valve fully.

2.If using a regulator with an adjustable flow meter, close the gun trigger and adjust the flow to give 15

– 20 cubic ft per hour (CFH) (7 – 10 I/min) [use 20 -– 25 CFH (10 – 12 I/min) when welding out of

position or in a drafty location for CO2]. For argon mixed gas, trigger to release gas pressure, and turn off the adjust the flow to give 25 – 30 CFH (12 – 14 I/min).

3.Keep the cylinder valve closed, except when using the SP-125 Plus. When finished welding:

a) Close the cylinder valve to stop gas flow.

b) Depress the gun trigger briefly to release the pressure in the gas hose.

c) Turn off the SP-125 Plus.

Making A Weld

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

2.See the Application Chart on the inside of wire feed section door for information on setting the SP-125 Plus controls.

3.Set the Voltage (“V”) and Wire Speed (“olo’”) con- trols to the settings suggested for the welding wire and base metal thickness being used.

4.Check that the polarity is correct for the welding wire being used and that the gas supply, if required, is turned on.

5.When using Innershield electrode, remove the gas nozzle and install the gasless nozzle. This will improve visibility of the arc and protect the gas dif- fuser from weld spatter. Refer to the MAINTE- NANCE section for details on nozzle replacement.

6.Refer to Figure B.7. Connect work clamp to metal to be welded. Work clamp must make good elec- trical contact to the workpiece. The workpiece must also be grounded as stated in “Arc Welding Safety Precautions” in the beginning of this manu- al.

7.Position gun over joint. End of wire may be lightly touching the work.

8.Lower welding helmet, close gun trigger, and begin welding. Hold the gun so the contact tip to work distance is about 3/8 inch (10 mm).

FIGURE B.7

GUN CABLE

WORKPIECE

ARC

WORK CLAMP

SP-125 PLUS

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Contents
SP-125 Plus California Proposition 65 Warnings SafetyElectric Shock can kill Iii Welding Sparks can cause fire or explosionSûreté Pour Soudage a L’Arc Précautions DE SûretéPlease Examine Carton and Equipment For Damage Immediately Thank YouTable of Contents Vii Installation Identify and Locate Components Safety PrecautionsElectric Shock can kill Stacking Work Clamp InstallationWork Cable Installation Select Suitable LocationConnecting Gun Cable to the SP-125 Plus GUN InstallationGAS Connection Input Connections Gas Solenoid Inlet Fitting Power Input CableRequirements For CSA Rated Output Code Requirements for Input ConnectionsRequirements For Rated Output Requirements For Maximum OutputWelding Sparks can cause fire or explosion Observe all safety information throughout this manualOperation Fumes and Gases can be dangerous Welding Capability Controls and Settings Design Features Advantages General DescriptionWelding Operations Wire LoadingSequence of Operation Wire Threading Friction Brake AdjustmentsMaking a Weld Shielding GasCleaning Tip And Nozzle Changing Machine Over to Feed Other Wire SizesProcess Guidelines Thermal Protection Wire Feed Overload ProtectionOverload Protection Output OverloadSELF-SHIELDED Fcaw Welding ARC Learning to WeldLearning to Weld ARC-WELDING CircuitProcess Selection Gmaw MIG Welding ARCFor Gmaw MIG Process Butt Welds Common MetalsJoint Types and Positions For Fcaw Innershield ProcessPenetration Welding In The Vertical PositionFillet Welds Correct Welding Position Machine SET UP for the SELF-SHIELDED Fcaw ProcessWelding Techniques for the SELF- Shielded Fcaw Process Vertical-down WeldingCorrect Welding Speed Correct Electrical Stickout ESOPractice Helpful HintsWelding Techniques for the Gmaw MIG Process Machine SET UP for the Gmaw MIG ProcessFigure B.24 To Eliminate Stubbing* in order of importance Troubleshooting WeldsTo Eliminate a Ropy Convex Bead in order of importance To Correct Poor Penetration in order of impor- tanceProper Gun Handling Application Chart K586-1 Deluxe Adjustable Gas Regulator Hose Kit AccessoriesOptional Accessories K1799-1 Argon-Mixed Gas Adjustable Regulator and Hose KitInnershield Fcaw Conversion Replacement PartsRoutine and Periodic MAINTE- Nance MaintenanceMaintenance Safety Precautions Items Requiring no MaintenanceContact Tip Cable Liner Drive Roll GUN and Cable MaintenanceConfiguration of Components in Wire Feeding System For Magnum 100L GUNChanging Drive Roll Changing the Contact TIPLiner trim length for gun with red trigger Magnum 100L Changing LinerFigure D.3 SP-125 Plus GUN Handle PartsHOW to USE Troubleshooting Guide TroubleshootingProblems Possible Areas Symptoms Misadjustments Troubleshooting GuideRecommended Course of Action Feeding Problems Welding Problems SP-125 Plus Wiring DiagramsSP-125 Plus SP-125 Plus $700.00 How To Read Shop DrawingsNew Lessons in Arc Welding Need Welding Training?Precaucion Warnung
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