Hobart Welding Products OM-949 manual Excessive Spatter, Incomplete Fusion, Lack Of Penetration

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	Table 6-2. Excessive Spatter
	Excessive Spatter − scattering of molten
	metal particles that cool to solid form near
	weld bead.
Possible Causes	Corrective Actions
Amperage too high for electrode.	Decrease amperage or select larger electrode.
Arc length too long or voltage too high	Reduce arc length or voltage.
	Table 6-3. 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.
	Table 6-4. Lack Of Penetration
	Lack Of Penetration − shallow fusion be-
	tween 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.

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Contents Description ProcessesFrom Hobart to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings About Pacemakers Principal Safety StandardsEMF Information Indique un message de sécurité particulier UNE Décharge Électrique peut entraîner la mortLES Fumées ET LES GAZ peuvent être dangereux Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Principales normes de sécuritéDuty Cycle Charts SpecificationsSelecting a Location Volt-Ampere CurvesVolt Model AmpsInstalling Electrode Cable and Barrel onto Electrode Holder Installing Electrode Holder And Work ClampInstalling Work Cable onto Work Clamp Removing Barrel From Elec- trode Holder150 ft 200 ft 250 ft Weld Output Cables350 ft 400 ft 45 m 60 m 70 m 90 m 105 m 120 m Put terminalsConnecting Input Power Electrical Service GuideControls Months Routine MaintenanceLubricating Shunt Block And Anti-Noise Adjustment Wrapper Remove wrapper from unit Crank Handle Shunt Shaft Reinstalling Amperage Adjustment IndicatorTrouble Remedy Troubleshooting− Electrical Diagrams Welding Methods Shielded Metal Arc Welding Smaw Procedure − Welding Methods & Troubleshooting6013 7014 Electrode And Amperage Selection ChartPositioning The Electrode Holder Striking An ArcConditions That Affect Weld Bead Shape Weld Bead CharacteristicsElectrode Angle Arc LengthButt Joints Electrode Movement During WeldingLap Joints Welding TroubleshootingTee Joints PorosityLack Of Penetration Excessive SpatterIncomplete Fusion Burn-Through Excessive PenetrationWaviness Of Bead DistortionStart Your Professional Welding Career Now − Parts List Dia Part Description Quantity Page Assistance ServiceSupport Hobart Welding Products Contact your Distributor for