Hobart 180 SD manual Troubleshooting Burn-Through, Troubleshooting Waviness Of Bead

Page 39

9-19. Troubleshooting – Burn-Through

Burn-Through – weld metal melting completely through base metal resulting in holes where no metal remains.

Possible Causes	Corrective Actions

Excessive heat input.	Select lower amperage. Use smaller electrode.

	Increase and/or maintain steady travel speed.

9-20. Troubleshooting – Waviness Of Bead

Waviness Of Bead – weld metal that is not parallel and does not cover joint formed by base metal.

Possible Causes	Corrective Actions

Unsteady hand.	Use two hands. Practice technique.

9-21. Troubleshooting – Distortion

			Distortion – contraction of weld met-
			al during welding that forces base
			metal to move.
		Base metal moves
		Base metal moves
		in the direction of
		in the direction of
		the weld bead.

Possible Causes			Corrective Actions

Excessive heat input.			Use restraint (clamp) to hold base metal in position.

			Make tack welds along joint before starting welding operation.

			Select lower amperage for electrode.

			Increase travel speed.

			Weld in small segments and allow cooling between welds.

OM-355 Page 35

Image 39

Contents OM-355 ProcessesDescription From Hobart to You Table of Contents Page Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding HazardsBuildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyesPrincipal Safety Standards About Pacemakers EMF InformationLES Fumé ES ET LES GAZ peuvent ê tre dangereux Signification des symbolesConsignes DE Securite Lire Avant Utilisation UN Choc É Lectrique peut tuerLE Soudage peut provoquer un incendie ou une explosion DES Particules Volantes peuvent blesser les yeuxLE Bruit peut affecter l’ouïe DES Organes Mobiles peuvent provoquer des blessures Risque D’INCENDIE OULA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peutPrincipales normes de sé curité Information sur les champs é lectromagné tiquesConsignes relatives aux stimulateurs cardiaques Movement InstallationIncluded with Your Unit Selecting a LocationDimensions And Weights SpecificationsDuty Cycle Chart Volt-Ampere Curves Weld Output Terminals And Selecting Cable SizesARC Welding can cause Electromagnetic Interference Necting to receptacle Remote 14 ReceptacleShielding Gas Connections SocketInput Amperes at Rated Output Electrical Service GuideConnecting Input Power Input VoltageOutput Selector Switch OperationControls Select weld process Select polarity Connect remote control see Section OM-355Example of Remote Amperage Control For TIG Gtaw Welding Select weld process Select polarity Select amperage ExampleApplication Typical TIG ConnectionsTypical Stick Connections Remote Foot ControlMaintenance and Troubleshooting Routine MaintenanceProcess and Material Thickness Guide Label Justing spark gaps Adjusting Spark GapsTroubleshooting Turn Off power before adCircuit Diagram For Welding Power Source Electrical DiagramWelding Processes Using HF Sources Of HF Radiation From Incorrect InstallationHigh Frequency HF Building Metal Building Correct InstallationGround Wire NonmetalSafety Information About Tungsten Selecting and Preparing Tungsten ElectrodeSelecting Tungsten Electrode Preparing Tungsten For DC Electrode Negative Dcen Welding Mables away Guidelines for TIG Welding GtawPositioning The Torch Instead of thoriated. ThoTungsten With Filler Rod Torch Movement During WeldingTungsten Without Filler Rod Welding direction Form pool Tilt torchButt Weld And Stringer Bead Joint Lap Joint Corner Joint Positioning Torch Tungsten For Various Weld JointsOM-355 Stick Welding Procedure Weld current starts when electrode touches work- pieceStick Welding Smaw Guidelines Electrode and Amperage Selection Chart Striking an Arc Scratch Start TechniqueStriking an Arc Tapping Technique 9090 End View of Work Angle Poor Weld Bead CharacteristicsGood Weld Bead Characteristics Positioning Electrode HolderElectrode Movement During Welding Conditions That Affect Weld Bead Shape16 in 1.6 mm Tack Welds Butt JointsLap Joint Tee JointPossible Causes Corrective Actions Troubleshooting PorosityTroubleshooting Excessive Spatter Weld TestTroubleshooting Incomplete Fusion Troubleshooting Lack Of PenetrationTroubleshooting Excessive Penetration Troubleshooting Burn-Through Troubleshooting Waviness Of BeadTroubleshooting Distortion Main Assembly Parts ListDia Part Description Quantity Mkgs 043 Panel, Front w/Components Page Page Page Support ServiceContact your Distributor for Hobart Welding ProductsCall