Hobart 180 SD manual Troubleshooting Incomplete Fusion, Troubleshooting Lack Of Penetration

Page 38

9-16. Troubleshooting – Incomplete Fusion

			Incomplete Fusion – failure of weld metal to fuse completely with
			base metal or a preceeding weld bead.




	Possible Causes		Corrective Actions

Insufficient heat input.			Increase amperage. Select larger electrode and increase amperage.

Improper welding technique.			Place stringer bead in proper location(s) at joint during welding.

			Adjust work angle or widen groove to access bottom during welding.

			Momentarily hold arc on groove side walls when using weaving technique.

			Keep arc on leading edge of weld puddle.

Workpiece dirty.			Remove all grease, oil, moisture, rust, paint, coatings, slag, and dirt from work surface before
			welding.

9-17. Troubleshooting – Lack Of Penetration

			Lack Of Penetration – shallow fusion between weld metal and
			base metal.

Lack of Penetration			Good Penetration
Possible Causes			Corrective Actions
Improper joint preparation.			Material too thick. Joint preparation and design must provide access to bottom of groove.
Improper weld technique.			Keep arc on leading edge of weld puddle.
Insufficient heat input.			Increase amperage. Select larger electrode and increase amperage.
			Reduce travel speed.

9-18. Troubleshooting – Excessive Penetration

	Excessive Penetration – weld metal melting through base metal and
	hanging underneath weld.
Excessive Penetration	Good Penetration
Possible Causes	Corrective Actions
Excessive heat input.	Select lower amperage. Use smaller electrode.
	Increase and/or maintain steady travel speed.

OM-355 Page 34

Image 38

Contents Description OM-355Processes From Hobart to You Table of Contents Page Arc Welding Hazards Symbol UsageMarks a special safety message Electric Shock can killFlying Metal can injure eyes ARC Rays can burn eyes and skinWelding can cause fire or explosion Buildup of GAS can injure or killPrincipal Safety Standards EMF Information About PacemakersUN Choc É Lectrique peut tuer Signification des symbolesConsignes DE Securite Lire Avant Utilisation LES Fumé ES ET LES GAZ peuvent ê tre dangereuxLE Bruit peut affecter l’ouïe LE Soudage peut provoquer un incendie ou une explosionDES Particules Volantes peuvent blesser les yeux ’EMPLOI Excessif peut Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresConsignes relatives aux stimulateurs cardiaques Principales normes de sé curitéInformation sur les champs é lectromagné tiques Selecting a Location InstallationIncluded with Your Unit MovementDuty Cycle Chart Dimensions And WeightsSpecifications ARC Welding can cause Electromagnetic Interference Volt-Ampere CurvesWeld Output Terminals And Selecting Cable Sizes Socket Remote 14 ReceptacleShielding Gas Connections Necting to receptacleInput Voltage Electrical Service GuideConnecting Input Power Input Amperes at Rated OutputControls Output Selector SwitchOperation Select weld process Select polarity Select amperage Example Connect remote control see Section OM-355Example of Remote Amperage Control For TIG Gtaw Welding Select weld process Select polarityRemote Foot Control Typical TIG ConnectionsTypical Stick Connections ApplicationProcess and Material Thickness Guide Label Maintenance and TroubleshootingRoutine Maintenance Turn Off power before ad Adjusting Spark GapsTroubleshooting Justing spark gapsElectrical Diagram Circuit Diagram For Welding Power SourceHigh Frequency HF Welding Processes Using HFSources Of HF Radiation From Incorrect Installation Nonmetal Correct InstallationGround Wire Building Metal BuildingSelecting Tungsten Electrode Safety Information About TungstenSelecting and Preparing Tungsten Electrode Preparing Tungsten For DC Electrode Negative Dcen Welding Instead of thoriated. Tho Guidelines for TIG Welding GtawPositioning The Torch Mables awayWelding direction Form pool Tilt torch Torch Movement During WeldingTungsten Without Filler Rod Tungsten With Filler RodPositioning Torch Tungsten For Various Weld Joints Butt Weld And Stringer Bead Joint Lap Joint Corner JointOM-355 Stick Welding Smaw Guidelines Stick Welding ProcedureWeld current starts when electrode touches work- piece Striking an Arc Tapping Technique Electrode and Amperage Selection ChartStriking an Arc Scratch Start Technique Positioning Electrode Holder Poor Weld Bead CharacteristicsGood Weld Bead Characteristics 9090 End View of Work AngleConditions That Affect Weld Bead Shape Electrode Movement During WeldingTee Joint Butt JointsLap Joint 16 in 1.6 mm Tack WeldsWeld Test Troubleshooting PorosityTroubleshooting Excessive Spatter Possible Causes Corrective ActionsTroubleshooting Excessive Penetration Troubleshooting Incomplete FusionTroubleshooting Lack Of Penetration Troubleshooting Distortion Troubleshooting Burn-ThroughTroubleshooting Waviness Of Bead Parts List Main AssemblyDia Part Description Quantity Mkgs 043 Panel, Front w/Components Page Page Page Service SupportCall Contact your Distributor forHobart Welding Products