Miller Electric 250 manual Troubleshooting − Burn-Through, Troubleshooting − Waviness Of Bead

Page 69

15-19. 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.

15-20. 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.

15-21. 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-217 455 Page 65

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Contents File Engine Drive OM-217 455HVisit our website at 2007−05−21From Miller to You Table of Contents 13-3 13-213-4 13-5Arc Welding Hazards Symbol UsageElectric Shock can kill HOT Parts can cause severe burnsBuildup of GAS can injure or kill Fumes and Gases can be hazardousARC Rays can burn eyes and skin Welding can cause fire or explosionCompressed Air Hazards Engine HazardsHOT Parts can cause burns and injury Welding Wire can cause injuryFire or Explosion hazard Falling Unit can cause injuryCalifornia Proposition 65 Warnings Principal Safety StandardsEMF Information Radiation can cause interference− Consignes DE Sécurité − Lire Avant Utilisation Signification des symbolesUN Choc Électrique peut tuer Indique des instructions spécifiquesDES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion LE Bruit peut affecter l’ouïe ’EXPLOSION DE LA Batterie peuDES Organes Mobiles peuvent pro voquer des blessures LA Chaleur DU Moteur peut pro- voquer un incendie ’AIR Comprimé peut provoquer des blessuresRisque D’INCENDIE OU D’EXPLO- Sion DES Organes Mobiles peuvent provoquer des blessures LE Surchauffement peut endom- mager le moteur électriqueLES Fils DE Soudage peuvent provoquer des blessures ’EMPLOI Excessif peutPrincipales normes de sécurité Proposition californienne 65 AvertissementsInformation EMF En ce qui concerne les implants médicauxSymbol Definitions − SpecificationsWeld, Power, and Engine Specifications − DefinitionsDimensions, Weights, and Operating Angles Dimensions For Units With Optional Running GearDimensions Installing Welding Generator − InstallationVehicle frame. Always connect a ground wire MountingConnecting the Battery Installing Exhaust Pipe+ − Stop engine and let coolOverview And Engine Prestart Checks Starting engine for the first time Engine Left Side Engine Right SideRun-in period first 100 hours Daily pre-start checksCorrect Installation Connecting to Weld Output TerminalsWork Weld Output Terminal Tools Needed Do not placeSelecting Weld Cable Sizes Place switch in Run position to operate most MIG equipment Engine Control Switches− Operating the Welding Generator Do not use glow plugs longer than 20 secondsWeld Output Controls Typical Settings For 7018 1/8 Electrode Typical Stick Welding Connections And Control SettingsStop engine Work Clamp Electrode HolderSet Weld Process Selector switch to Wire + Dcep position Typical MIG Welding Connections And SettingsSet Weld Process Selector switch to Wire + position Set Weld Process Selector switch to Wire − position DcenTools Needed 3/4 Work Not Used To Work Left Side View − Operating Auxiliary Equipment Generator Power ReceptaclesAt least once a month, run engine at To verify Gfci is working properlySimultaneous Weld And Power − Operating Optional Battery Charger Battery Charge ControlsDetermining Battery Charging Current Battery Charge Cable Connections Minutes Battery Charging ProcedureStart Your Professional Welding Career Now Routine Maintenance − Maintenance and TroubleshootingStop engine and let cool Oil And Fuel Maintenance Label And Engine Maintenance Activities804 197-A / Ref 803 111-A / 227 Ment is not covered by the warranty Cleaner or with dirty element. EngineAir cleaner primary element can Damage when determining whetherAdjusting Fuel Solenoid Position Adjusting Engine SpeedStop screw is factory-set and should not be adjusted Checking Fuel SolenoidChecking Throttle Solenoid Adjusting Throttle Solenoid16 mm Check for non-bindingMaking Engine Speed Adjustments Adjusting Idle SpeedAdjusting Weld/Power Speed Component Panel Stop engine Overload ProtectionFuse F1 Supplementary Protector CB8Generator Power Troubleshooting TablesWelding Trouble RemedyEngine Maintenance Display ActionRecommended Spare Parts − Parts ListRecommended Spare Parts Current transformer CT1, and throttle solenoid TS1Circuit Diagram For Welding Generator − Electrical Diagrams228 719-B OM-217 455 231 607-B Run-In And Wetstacking − RUN-IN and WetstackingFuel Consumption Curves − Performance DataUS Gal./Hr IdleDuty Cycle Generator Power CurveVolts AC Amperes At 120 VoltsStick Mode Volt-Ampere Curves DC Amps CC/AC Stick Mode AC VoltsAC Amps DC Amps MIG Mode Volt-Ampere Curve− Generator Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame How Much Power Does Equipment Require? Grounding When Supplying Building SystemsUse ground device as stated in electrical codes Amperes x Volts = WattsApproximate Power Requirements For Farm/Home Equipment Approximate Power Requirements For Industrial MotorsIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running WattsContractor Rating Starting Watts Running Watts Approximate Power Requirements For Contractor EquipmentHow Much Power Can Generator Supply? Power Required To Start MotorSingle-Phase Induction Motor Starting Requirements KVA/HP x HP x 1000 / Volts = Starting AmperageTypical Connections To Supply Standby Power Selecting Extension Cord Use Shortest Cord Possible Stick Welding Procedure Weld current starts when electrode touches work- piece− Stick Welding Smaw Guidelines Electrode and Amperage Selection Chart Striking an Arc − Scratch Start TechniqueStriking an Arc − Tapping Technique Good Weld Bead Characteristics Poor Weld Bead CharacteristicsPositioning Electrode Holder 10-30 9090 End View of Work AngleElectrode Movement During Welding Conditions That Affect Weld Bead ShapeLap Joint Butt JointsTee Joint 16 in 30 1.6 mm Tack WeldsTroubleshooting − Excessive Spatter Troubleshooting − PorosityWeld Test Possible Causes Corrective ActionsTroubleshooting − Incomplete Fusion Troubleshooting − Lack Of PenetrationTroubleshooting − Excessive Penetration Troubleshooting − Burn-Through Troubleshooting − Waviness Of BeadTroubleshooting − Distortion Work like a Pro Service Your distributor also givesSupport Miller Electric Mfg. Co To locate a Distributor or Service Agency visitFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s