Hobart Welding Products OM-950 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 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 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 sécuritéSymbols And Definitions − DefinitionsManufacturer’s Rating Labels Specifications − InstallationAC/DC Models AC ModelsFor AC/DC Models Duty Cycle ChartsFor 235/160A Models For AC ModelsVolt-Ampere Curves For AC Models For 235A Models Selecting a LocationInstalling Electrode Cable and Barrel Installing Electrode Holder And Work ClampHolder or work clamp Onto Electrode HolderWeld Output Cables Electrical Service Guide50/60 Hz Input Voltage 230 Input Amperes At Rated OutputOut input power before instal Connecting Input Power=GND/PE Earth Groundbe sure to supply correct in- put power Disconnect and lockout/tagControls − OperationControls For AC/DC Models For DC Weld OutputControls For AC Models Routine Maintenance − Maintenance & TroubleshootingLubricating Shunt Block And Anti-Noise Adjustment MonthsReinstalling Amperage Adjustment Indicator Trouble Remedy TroubleshootingCircuit Diagram For AC 230 Volts Models Circuit Diagram For AC/DC 230 Volts ModelsWelding Methods Shielded Metal Arc Welding Smaw Procedure − Welding Methods & Troubleshooting6013 7014 Electrode And Amperage Selection ChartPositioning The Electrode Holder Striking An Arc Conditions That Affect Weld Bead Shape Weld Bead Characteristics Electrode Angle Arc LengthButt Joints Electrode Movement During WeldingLap Joints Welding TroubleshootingTee Joints PorosityExcessive Spatter Incomplete FusionLack Of Penetration Burn-Through Excessive PenetrationWaviness Of Bead DistortionStart Your Professional Welding Career Now Main Assembly AC/DC model illustrated − Parts ListMain Assembly Page Service SupportAssistance Hobart Welding Products Contact your Distributor for