Manuals / Miller Electric / Power Tools / Welding System

Miller Electric Bobcat 250 manual Push Perpendicular Drag, Short Normal Long, Slow Normal Fast

Models: Bobcat 250

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15-3. Conditions That Affect Weld Bead Shape

.Weld bead shape depends on gun angle, direction of travel, electrode extension (stickout), travel speed, thickness of base metal, wire feed speed (weld current), and voltage.

	10°
	Push	10°
		10°
Perpendicular		Drag

GUN ANGLES AND WELD BEAD PROFILES

Short

Normal

Long

ELECTRODE EXTENSIONS (STICKOUT)

Short

Normal

Long

FILLET WELD ELECTRODE EXTENSIONS (STICKOUT)

Slow	Normal	Fast
	GUN TRAVEL SPEED	S-0634
		S-0634

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Miller Electric Bobcat 250 manual Push Perpendicular Drag, Short Normal Long, Slow Normal Fast

Contents

OM-4419 File Engine DriveVisit our website at 2007−05 From Miller to You Table of Contents 10-1 10-210-3 11-1 Symbol Usage Arc Welding HazardsElectric Shock can kill HOT Parts can cause severe burns Fumes and Gases can be hazardous Buildup of GAS can injure or killARC Rays can burn eyes and skin Welding can cause fire or explosion Engine Hazards Compressed Air Hazards Welding Wire can cause injury HOT Parts can cause burns and injuryFire or Explosion hazard Falling Unit can cause injury Principal Safety Standards California Proposition 65 WarningsEMF Information Radiation can cause interference Signification des symboles − Consignes DE Sécurité − Lire Avant UtilisationUN Choc Électrique peut tuer Indique des instructions spécifiques LE Soudage peut provoquer un in cendie ou une explosion DES Pièces Chaudes peuvent provoquer des brûlures gravesLES Fumées ET LES GAZ peuvent être dangereux DES Organes Mobiles peuvent pro voquer des blessures LE Bruit peut affecter l’ouïe’EXPLOSION DE LA Batterie peu Risque D’INCENDIE OU D’EXPLO- Sion LA Chaleur DU Moteur peut pro- voquer un incendie’AIR Comprimé peut provoquer des blessures LE Surchauffement peut endom- mager le moteur électrique DES Organes Mobiles peuvent provoquer des blessuresLES Fils DE Soudage peuvent provoquer des blessures ’EMPLOI Excessif peut Proposition californienne 65 Avertissements Principales normes de sécuritéInformation EMF En ce qui concerne les implants médicaux − Specifications Symbol DefinitionsWeld, Power, and Engine Specifications − Definitions Dimensions, Weights, and Operating Angles Dimensions For Units With Optional Running GearRobin-PoweredUnit 560 lb 254 kg Dimensions Fuel Consumption Robin-Powered Units Fuel Consumption Kohler-Powered Units Volt-Ampere Curves For CC/AC ModeFor CC/DC Mode For CV/DC Mode 100% Duty Cycle at 250 Amperes Generator Power CurveDuty Cycle − Installation Installing Welding Generator Engine Prestart Checks Robin-Powered Units 0000Oil Check Oil Engine Prestart Checks Kohler-Powered Units Open top service door Installing Exhaust Pipe Connecting Or Replacing the BatteryConnecting The Battery Connect negative − cable last + − Connecting to Weld Output Terminals Tools Needed Correct InstallationStop engine Work Weld Output Terminal Selecting Weld Cable Sizes − Operating the Welding Generator Front Panel Controls Cold Weather Engine Operation InfrequentlyLoaded Frequently Loaded Typical Stick Welding Connections And Control Settings Typical Settings For 7018 1/8 in ElectrodeWork Clamp Electrode Holder Tools Needed 3/4 Typical MIG Welding Connections And Settings Solid Wire ApplicationsFine Control, Weld Process switch Settings Quick connector Be sure to use the correct size weld cables see Section Self-Shielded Flux Core Wire Applications Fine Control, Weld Process switch Settings Typical Settings For 4043 Aluminum On 1/8 in MaterialWork Lines and may not suit all applications Cables see Section Generator Power Receptacles − Operating Auxiliary Equipment Simultaneous Weld And Power Wiring Optional 240 Volt PlugCurrent Available in Amperes 240 Receptacle Routine Maintenance Robin-Powered Units 100200 500 Maintenance Label Robin-Powered Units Stop engine. Disconnect negative − battery cable Servicing Air Cleaner Robin-Powered UnitsOverload Protection Robin-Powered Units Oil Fill Oil Check FullStop engine and let cool Oil Drain Valve 2 ID x 7 in Hose Oil Filter Adjusting Engine Speed Robin-Powered Units Idle Speed AdjustmentTurn idle speed screw for fine adjustments Weld/Power Speed Adjustment Servicing Optional Spark Arrestor Robin-Powered Units Material Thickness Reference Chart Routine Maintenance Kohler-Powered Units Hours Nl Weld Cables ~ Slip Rings Nl Brushes OM-4419 Maintenance Label Kohler-Powered Units Servicing Air Cleaner Kohler−Powered Units Stop engine and let cool Oil Drain Valve 2 ID x 7 in Hose Oil FilterClose valve and valve cap before adding oil Full Up fuel Adjusting Engine Speed Kohler-Powered Units Turn idle speed screw for fine ad- justments Overload Protection Kohler-Powered Units Servicing Optional Spark Arrestor Kohler-Powered Units − Troubleshooting Welding TroubleshootingGenerator Power Troubleshooting Trouble Remedy Check fuel level Engine TroubleshootingCheck receptacle wiring and connections − Parts List Switch S2, and throttle solenoid TS1Recommended Spare Parts Recommended Spare Parts − Electrical Diagrams Circuit Diagram For Welding Generator 228 460-A − Generator Power Guidelines Selecting EquipmentGrounding Generator To Truck Or Trailer Frame Electrically Bond Generator Grounding When Supplying Building Systems How Much Power Does Equipment Require?Use ground device as stated in electrical codes Amperes x Volts = Watts Approximate Power Requirements For Industrial Motors Approximate Power Requirements For Farm/Home EquipmentIndustrial Motors Rating Starting Watts Running Watts Farm/Home Equipment Rating Starting Watts Running Watts Approximate Power Requirements For Contractor Equipment Contractor Rating Starting Watts Running Watts Power Required To Start Motor How Much Power Can Generator Supply?Single-Phase Induction Motor Starting Requirements KVA/HP x HP x 1000 / Volts = Starting Amperage Typical Connections To Supply Standby Power Selecting Extension Cord Use Shortest Cord Possible − Stick Welding Smaw Guidelines Stick Welding ProcedureWeld current starts when electrode touches work- piece Striking an Arc − Tapping Technique Electrode and Amperage Selection ChartStriking an Arc − Scratch Start Technique Poor Weld Bead Characteristics Good Weld Bead CharacteristicsPositioning Electrode Holder 10-30 9090 Conditions That Affect Weld Bead Shape Electrode Movement During Welding Butt Joints Lap JointTee Joint Or Less Troubleshooting − Porosity Troubleshooting − Excessive SpatterWeld Test Possible Causes Corrective Actions Troubleshooting − Excessive Penetration Troubleshooting − Incomplete FusionTroubleshooting − Lack Of Penetration Troubleshooting − Distortion Troubleshooting − Burn-ThroughTroubleshooting − Waviness Of Bead − MIG Welding Gmaw Guidelines Holding And Positioning Welding Gun Slow Normal Fast Push Perpendicular DragShort Normal Long Gun Movement During Welding 15-9 Troubleshooting − Excessive Penetration 15-7 Troubleshooting − Excessive Spatter15-8 Troubleshooting − Porosity Improper joint preparation Lack Of Penetration − shallowFusion between weld metal Unsteady hand Support hand on solid surface or use two hands Fillet Common MIG Shielding GasesApplication Page Support ServiceYour distributor also gives To locate a Distributor or Service Agency visit Miller Electric Mfg. CoFor assistance in filing or settling claims, contact Your distributor and/or equipment manufacturer’s