Lincoln Electric 170I manual Troubleshooting Welds, To Eliminate a Ropy Convex Bead

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B-16

 

LEARNING TO WELD

 

B-16

 

 

 

 

 

•After you strike the arc, practice the correct electri- cal stickout. Learn to distinguish it by its sound.

•When you are sure that you can hold the correct electrical stickout, with a smooth “crackling” arc, start moving. Look at the molten puddle constantly,

•Run beads on a flat plate. Run them parallel to the top edge (the edge farthest away from you). This gives you practice in running straight welds, and also gives you an easy way to check your progress. The 10th weld will look considerably bet- ter than the first weld. By constantly checking on your mistakes and your progress, welding will soon be a matter of routine.

TROUBLESHOOTING WELDS

Good welds have excellent appearance.

To Eliminate Porosity (in order of importance):

•Turn on gas supply, if used

•Decrease voltage.

•Increase stickout.

•Increase WFS (wire feed speed).

•Decrease drag angle.

•Decrease travel speed.

NOTE: Always be sure the joint is free from moisture, oil, rust, paint or other contaminants.

To Eliminate a Ropy Convex Bead

(in order of importance):

•Increase voltage

•Decrease stickout.

•Decrease WFS (wire feed speed.

•Decrease travel speed.

•Decrease drag angle.

•Check for correct gas, if used.

To Reduce Spatter (in order of importance):

•Increase voltage.

•Increase drag angle.

•Decrease stickout.

•Increase WFS (wire feed speed).

•Decrease travel speed.

•Check for correct gas, if used.

To Correct Poor Penetration (in order of impor- tance):

•Decrease stickout.

•Increase WFS (wire feed speed).

•Increase voltage.

•Decrease speed.

•Decrease drag angle.

•Check for correct gas, if used.

If Arc Blow Occurs (in order of importance):

NOTE: Try different ground connection locations before adjusting procedures.

•Decrease drag angle.

•Increase stickout.

•Decrease voltage.

•Decrease WFS (wire feed speed.

•Decrease travel speed.

To Eliminate Stubbing* (in order of importance):

•Increase voltage

•Decrease WFS (wire feed speed)

•Decrease stickout

•Increase drag angle

*Stubbing occurs when the electrode drives through the molten puddle and hits the bottom plate tending to push the gun up.

Handymig 170i

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Contents Handymig For Engine powered equipment SafetyElectric and Magnetic Fields may be dangerous Iii Electric Shock can killARC Rays can burn Fumes and Gases can be dangerousWelding Sparks can cause fire or explosion Cylinder may explode if damagedAssessment of Area Instructions for ELECTRO- Magnetic CompatibilityPlease Examine Carton and Equipment For Damage Immediately Table of Contents Section F ViiiSection D Section ETechnical Specifications Handymig InstallationIdentify and Locate Components Safety PrecautionsStacking Work Clamp InstallationSelect Suitable Location Output ConnectionsGAS Connection GUN InstallationWork Cable Installation Connecting Gun Cable to the HandymigFigure A.5 Input ConnectionsLine Cord Connection Electrical Input Connection For Rated OutputGeneral Description Design Features AdvantagesOperational Features and Controls OperationWelding Capability Controls and SettingsLimitations Welding Operations Wire LoadingSequence of Operation Figure B.4 Wire ThreadingProcess Guidelines Cleaning Tip And NozzleMaking a Weld Shielding Gas Changing Machine Over to Feed Other Wire SizesWelding with Gmaw MIG Welding with Fcaw InnershieldOverload Protection Learning to WeldLearning to Weld Gmaw MIG Welding ARC SELF-SHIELDED Fcaw Welding ARCCommon Metals Process SelectionJoint Types and Positions Penetration 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 ProcessFor the Handymig 170i, use the following To Eliminate Stubbing* in order of importance Troubleshooting WeldsTo Eliminate a Ropy Convex Bead To Correct Poor Penetration in order of impor- tanceProper Gun Handling Application Chart Routine Maintenance MaintenanceGUN and Cable Maintenance Changing the Contact TIP Component Replacement ProceduresChanging Drive Roll GUN Handle Parts Changing LinerLiner trim length Ground Test Procedure HOW to USE Troubleshooting Guide 1TROUBLESHOOTINGE-1Recommended Course of Action TroubleshootingTroubleshooting Guide Problems Possible Areas Symptoms MisadjustmentsContact your local Liquid Arc Authorized Field Service FacilityWelding Problems Handymig 170i Wiring Diagram Code Wiring DiagramsPrecaucion Warnung Copyright 2000 Lincoln Global Inc
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