Hobart Welding Products OM-949 Excessive Penetration, Burn-Through, Waviness Of Bead, Distortion

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	Table 6-5. Excessive Penetration
	Excessive Penetration − weld metal melt-
	ing through base metal and hanging un-
	derneath 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.
	Table 6-6. Burn-Through
	Burn-Through − weld metal melting com-
	pletely through base metal resulting in
	holes where no metal remains.

Possible Causes	Corrective Actions


Excessive heat input.	Select lower amperage. Use smaller electrode with lower amperage.
	Increase and/or maintain steady travel speed.

Table 6-7. 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.

Table 6-8. Distortion

Distortion − contraction of weld metal dur- ing welding that forces base metal to move.

			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-949 Page 26

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Contents Processes DescriptionFrom 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 killCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique un message de sécurité particulier DES Particules Volantes peuvent blesser les yeux LE Soudage peut provoquer unIncendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures graves’EMPLOI Excessif peut SUR Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser DES Organes Mobiles peuvent provoquer des blessuresPrincipales normes de sécurité En ce qui concerne les stimulateurs cardiaquesSpecifications Duty Cycle ChartsVolt Model Volt-Ampere CurvesSelecting a Location AmpsInstalling Work Cable onto Work Clamp Installing Electrode Holder And Work ClampInstalling Electrode Cable and Barrel onto Electrode Holder Removing Barrel From Elec- trode Holder350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Weld Output Cables150 ft 200 ft 250 ft Put terminalsElectrical Service Guide Connecting Input PowerControls Routine Maintenance Lubricating Shunt Block And Anti-Noise AdjustmentMonths Reinstalling Amperage Adjustment Indicator Wrapper Remove wrapper from unit Crank Handle Shunt ShaftTroubleshooting Trouble Remedy− Electrical Diagrams − Welding Methods & Troubleshooting Welding Methods Shielded Metal Arc Welding Smaw ProcedureElectrode And Amperage Selection Chart 6013 7014Striking An Arc Positioning The Electrode HolderElectrode Angle Weld Bead CharacteristicsConditions That Affect Weld Bead Shape Arc LengthElectrode Movement During Welding Butt JointsTee Joints Welding TroubleshootingLap Joints PorosityExcessive Spatter Incomplete FusionLack Of Penetration Waviness Of Bead Excessive PenetrationBurn-Through DistortionStart Your Professional Welding Career Now − Parts List Dia Part Description Quantity Page Service SupportAssistance Contact your Distributor for Hobart Welding Products