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OM-4403 Page 64

13-9. Troubleshooting – Excessive Spatter

Excessive Spatter – scattering of molten metal particles that
cool to solid form near weld bead.

S-0636

Possible Causes

Corrective Actions

Wire feed speed too high.

Select lower wire feed speed.

Voltage too high.

Select lower voltage range.

Electrode extension (stickout) too long.

Use shorter electrode extension (stickout).

Workpiece dirty.

Remove all grease, oil, moisture, rust, paint, undercoating, and dirt from work surface before welding.

Insufficient shielding gas at welding arc.

Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.

Dirty welding wire.

Use clean, dry welding wire.

Eliminate pickup of oil or lubricant on welding wire from feeder or liner.

13-10. Troubleshooting – Porosity

Porosity – small cavities or holes resulting from gas pockets
in weld metal.

S-0635

Possible Causes

Corrective Actions

Insufficient shielding gas at welding arc.

Increase flow of shielding gas at regulator/flowmeter and/or prevent drafts near welding arc.

Remove spatter from gun nozzle.

Check gas hoses for leaks.

Place nozzle 1/4 to 1/2 in (6-13 mm) from workpiece.

Hold gun near bead at end of weld until molten metal solidifies.

Wrong gas.

Use welding grade shielding gas; change to different gas.

Dirty welding wire.

Use clean, dry welding wire.

Eliminate pick up of oil or lubricant on welding wire from feeder or liner.

Workpiece dirty.

Remove all grease, oil, moisture, rust, paint, coatings, and dirt from work surface before welding.

Use a more highly deoxidizing welding wire (contact supplier).

Welding wire extends too far out of nozzle.

Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle.

13-11. Troubleshooting – Excessive Penetration

Good Penetration

Excessive Penetration – weld metal melting through base metal
and hanging underneath weld.

Excessive Penetration

S-0639

Possible Causes

Corrective Actions

Excessive heat input.

Select lower voltage range and reduce wire feed speed.

Increase travel speed.

Содержание Bobcat 250 NT

Страница 1: ...Processes Description Non Critical TIG GTAW Welding Stick SMAW Welding MIG GMAW Welding Flux Cored FCAW Welding Engine Driven Welding Generator OM 4403 200 291E April 2002 Visit our website at www Mi...

Страница 2: ...value established in 1929 This Owner s Manual is designed to help you get the most out of your Miller products Please take time to read the Safety precautions They will help you protect yourself again...

Страница 3: ...le Sizes 18 SECTION 5 OPERATING THE WELDING GENERATOR 19 5 1 Front Panel Controls 19 5 2 Typical Stick Welding Connections And Control Settings 20 5 3 Typical MIG Welding Connections And Settings 21 5...

Страница 4: ...g And Positioning Welding Gun 61 13 5 Conditions That Affect Weld Bead Shape 62 13 6 Gun Movement During Welding 63 13 7 Poor Weld Bead Characteristics 63 13 8 Good Weld Bead Characteristics 63 13 9 T...

Страница 5: ...n not in use Do not use worn damaged undersized or poorly spliced cables Do not drape cables over your body If earth grounding of the workpiece is required ground it directly with a separate cable Do...

Страница 6: ...uch hot engine parts or just welded parts bare handed NOISE can damage hearing Noise from some processes or equipment can damage hearing Wear approved ear protection if noise level is high MAGNETIC FI...

Страница 7: ...ammables Keep exhaust and exhaust pipes way from flammables EXHAUST SPARKS can cause fire Do not let engine exhaust sparks cause fire Use approved engine exhaust spark arrestor in required areas see a...

Страница 8: ...une Rd Miami FL 33126 National Electrical Code NFPA Standard 70 from National Fire Protec tion Association Batterymarch Park Quincy MA 02269 Safe Handling of Compressed Gases in Cylinders CGA Pamphlet...

Страница 9: ...oquer une lectrocution Mettre l appareil hors tension quand on ne l utilise pas Ne pas utiliser des c bles us s endommag s de grosseur insuffisante ou mal piss s Ne pas enrouler les c bles autour du c...

Страница 10: ...pour travailler sur un moteur chaud Ne pas toucher mains nues les parties chaudes du moteur ni les pi ces r cemment soud es LE BRUIT peut affecter l ou e Le bruit des processus et des quipements peut...

Страница 11: ...nir distance les produits inflammables de l chappement LES TINCELLES L CHAPPEMENT peuvent provoquer un incendie Emp cher les tincelles d chappement du moteur de provoquer un incendie Utiliser uniqueme...

Страница 12: ...W Lejeune Rd Miami FL 33126 National Electrical Code NFPA Standard 70 de la National Fire Protec tion Association Batterymarch Park Quincy MA 02269 Safe Handling of Compressed Gases in Cylinders CGA P...

Страница 13: ...Engine Specifications This unit uses either an Onan Performer OHV or a Kohler CH 20 engine Differences between models are noted throughout this manual Note Welding Mode Weld Output Range Rated Weldin...

Страница 14: ...18 in 457 mm G Do not move or operate unit where it could tip B 16 1 2 in 419 mm 4 Holes tip C 3 4 in 19 mm E D 3 1 8 in 79 mm F 25 E 32 3 4 in 832 mm 25 F 45 1 2 in 1156 mm 25 25 G 13 32 in 10 mm Di...

Страница 15: ...OM 4403 Page 11 3 4 Fuel Consumption Onan Powered Units 206 148 3 5 Fuel Consumption Kohler Powered Units 200 299...

Страница 16: ...6 200 297 200 298 The volt ampere curve shows the minimum and maximum voltage and amperage output capabilities of the welding generator Curves of all other settings fall between the curves shown A For...

Страница 17: ...ways securely fasten welding generator onto transport vehicle or trailer and comply with all DOT and other applicable codes Always ground generator frame to vehicle frame to pre vent electric shock an...

Страница 18: ...en and do not use the oil pressure shutdown system to monitor oil level Fuel Add fresh fuel before starting engine the first time see mainte nance label for specifications Al ways leave filler neck em...

Страница 19: ...en and do not use the oil pressure shutdown system to monitor oil level Fuel Add fresh fuel before starting engine the first time see mainte nance label for specifications Al ways leave filler neck em...

Страница 20: ...Wait ten minutes and check electro lyte level If necessary add electro lyte to raise to proper level Reins tall vent caps 6 Battery Charger Read and follow all instruc tions supplied with battery char...

Страница 21: ...6 Installing Exhaust Pipe 801 681 Ref 200 017 Engine backfire can cause se vere burns or other injuries Do not point exhaust pipe toward control panel Keep away from exhaust outlet Point exhaust pipe...

Страница 22: ...dersized or poorly spliced cables Welding Amperes 10 60 Duty Cycle 60 100 Duty Cycle 10 100 Duty Cycle 100 4 20 4 20 4 20 3 30 2 35 1 50 1 0 60 1 0 60 150 3 30 3 30 2 35 1 50 1 0 60 2 0 70 3 0 95 3 0...

Страница 23: ...ct type of weld output Use a positive position for Direct Current Electrode Positive DCEP and a negative position for Direct Current Electrode Negative Use AC position for alternating current 5 Coarse...

Страница 24: ...Weld Process Selector switch to Stick position Set Coarse Range switch to 60 140 1 8 position Set Fine control at 7 or higher for best results 1 2 ELECTRODE DC AC POSITION PENETRATION USAGE MIN PREP R...

Страница 25: ...ching Tighten knob See wire feeder manual for wire thread ing procedure Insert gun trigger plug item 4 into matching receptacle and tighten threaded collar Connect gas hose from feeder to regula tor o...

Страница 26: ...r and position as close as possible to drive rolls without touching Tight en knob See wire feeder manual for wire threadingprocedure Insert gun trigger plug item 4 into matching receptacle and tighten...

Страница 27: ...weld control receptacle Tighten threaded collar Connect ac power cord item 12 to 120 volt ac receptacle on welding generator Connect gas hose from spoolgun to regula tor on Argon bottle Reinstall weld...

Страница 28: ...CB1 and CB2 protect RC1 from over load If CB1 or CB2 opens RC1 and one of the 120 volt receptacles does not work 120 volts may still be pres ent at RC1 Power is still present at the 240 volt receptacl...

Страница 29: ...detected the GFCI Reset button pops out and the circuit opens to dis connect the faulty equipment Check for damaged tools cords plugs etc con nected to the receptacle Press button to re set receptacl...

Страница 30: ...20 V loads 7 Current Available in Amperes 240 V Receptacle Each 120 V Duplex Receptacle V x A Watts 42 37 32 27 22 0 5 10 15 20 Tools Needed SECTION 7 MAINTENANCE ONAN POWERED UNITS 7 1 Routine Mainte...

Страница 31: ...r cleaner element See Section 7 3 200 h Replace fuel filter See Section 7 5 Change oil filter See Section 7 5 and maintenancelabel Check spark plugs Replace unreadable labels 500 h Repair or replace c...

Страница 32: ...OM 4403 Page 28 7 2 Maintenance Label Onan Powered Units...

Страница 33: ...Powered Units 802 921 B Stop engine Disconnect negative battery cable 1 Fuse F1 See Parts List F1 protects the weld excitation winding from overload If F1 opens weld output stops or is low 2 Fuse F2...

Страница 34: ...rd ing to engine owner s manual Close valve and valve cap before adding oil and running engine Fill crankcase with new oil to full mark on dipstick see Section 7 2 4 Fuel Filter 5 Fuel Line Replace li...

Страница 35: ...screws Adjust solenoid position so engine runs at idle speed If necessary back out idle speed screw so solenoid can be moved to correct position Tight en mounting screws Be sure sole noid linkage wor...

Страница 36: ...its Follow the storage procedure in the engine owner s manual if the unit will not be used for an extended period Note Recycle engine fluids Stop engine before maintaining See also Engine Manual and m...

Страница 37: ...tem See Engine Manual 200 h Replace fuel filter See Section 8 4 Change oil filter See Section 8 4 and maintenance label Replace unreadable labels Check spark plugs 500 h Repair or replace cracked cabl...

Страница 38: ...822 Ref 200 017 S 0759 Stop engine Do not run engine without air cleaner or with dirty element 1 Wrapper Foam Element Wash wrapper with soap and water solution Allow wrapper to air dry completely Spr...

Страница 39: ...ine oil and filter accord ing to engine owner s manual Close valve and valve cap before adding oil and running engine Fill crankcase with new oil to full mark on dipstick see Section 8 2 4 Fuel Filter...

Страница 40: ...ews 3 Idle Speed Screw Loosen mounting screws Adjust solenoid position so engine runs at idle speed If necessary back out idle speed screw so solenoid can be moved to correct position Tight en mountin...

Страница 41: ...ower output stops or is low 3 Fuse F6 See Parts List F6 protects the engine wiring sys tem from overload If F6 opens engine will not crank Replace any open fuses Reinstall cover before operating If a...

Страница 42: ...ol settings Check engine speed and adjust if necessary see Section 7 6 or 8 5 Erratic weld output Check control settings Tighten and clean connections to electrode and workpiece Use dry properly store...

Страница 43: ...arts List for location Have Factory Authorized Service Agent check fuel shutoff solenoid FS1 FS1 optional on Onan powered units Engine starts but stops when Engine Check oil level Control switch retur...

Страница 44: ...or smooth operation Tune up engine according to engine manual Engine does not return to idle speed Remove weld and generator power loads Check throttle linkage for smooth non binding operation Have Fa...

Страница 45: ...OM 4403 Page 41 Notes...

Страница 46: ...OM 4403 Page 42 SECTION 10 ELECTRICAL DIAGRAMS Figure 11 1 Circuit Diagram For Welding Generator...

Страница 47: ...OM 4403 Page 43 202 547 D...

Страница 48: ...s symbol and or wording 3 1 11 2 Grounding Generator To Truck Or Trailer Frame S 0854 Always ground generator frame to vehicle frame to pre vent electric shock and static electricity hazards 1 Generat...

Страница 49: ...sistive Load Equipmentwith a motor is a non re sistive load and requires approxi mately six times more power while starting the motor than when run ning see Section 11 8 3 Rating Data Rating shows vol...

Страница 50: ...Home Equipment Rating Starting Watts Running Watts Stock Tank De Icer 1000 1000 Grain Cleaner 1 4 HP 1650 650 Portable Conveyor 1 2 HP 3400 1000 Grain Elevator 3 4 HP 4400 1400 Milk Cooler 2900 1100 M...

Страница 51: ...P 6000 1500 1 1 2 HP 8200 2200 2 HP 10500 2800 Electric Chain Saw 1 1 2 HP 12 in 1100 1100 2 HP 14 in 1100 1100 Electric Trimmer Standard 9 in 350 350 Heavy Duty 12 in 500 500 Electric Cultivator 1 3...

Страница 52: ...r Starting Requirements Motor Start Code G H J K L M N P KVA HP 6 3 7 1 8 0 9 0 10 0 11 2 12 5 14 0 EXAMPLE Calculate the starting amperage required for a 230 V 1 4 HP motor with a motor start code of...

Страница 53: ...ergency Disconnect Allows the utility power to be quickly disconnected from the building electrical system 6 Extension Cord Select as shown in Section 11 11 7 Generator Connections Connect terminals o...

Страница 54: ...15 40 4800 112 34 62 19 37 11 45 5400 100 30 62 19 50 6000 87 26 50 15 Conductor size is based on maximum 2 voltage drop Cord Lengths for 240 Volt Loads If unit does not have GFCI receptacles use GFC...

Страница 55: ...s clean be fore welding 2 Work Clamp 3 Electrode A small diameter electrode requires less current than a large one Fol low electrode manufacturer s instructions when setting weld am perage see Section...

Страница 56: ...LET ALL ALL EP EP EP EN EP EN EP EP EN EP EP 6010 6011 6013 7014 7018 7024 NI CL 308L EP ELECTRODE POSITIVE REVERSE POLARITY EN ELECTRODE NEGATIVE STRAIGHT POLARITY ELECTRODE AMPERAGE RANGE DIAMETER 1...

Страница 57: ...12 6 Poor Weld Bead Characteristics S 0053 A 1 Large Spatter Deposits 2 Rough Uneven Bead 3 Slight Crater During Welding 4 Bad Overlap 5 Poor Penetration 5 4 2 3 1 12 7 Good Weld Bead Characteristics...

Страница 58: ...orrect Angle 12 9 Electrode Movement During Welding Normally a single stringer bead is satisfactory for most narrow groove weld joints however for wide groove weld joints or bridging across gaps a wea...

Страница 59: ...3 4 12 11 Lap Joint S 0063 S 0064 1 Electrode 2 Single LayerFillet Weld Move electrode in circular motion 3 Multi Layer Fillet Weld Weld a second layer when a heavi er fillet is needed Remove slag be...

Страница 60: ...Causes Corrective Actions Arc length too long Reduce arc length Damp electrode Use dry electrode Workpiece dirty Remove all grease oil moisture rust paint coatings slag and dirt from work surface bef...

Страница 61: ...dirt from work surface before welding 12 17 Troubleshooting Lack Of Penetration Lack Of Penetration shallow fusion between weld metal and base metal Lack of Penetration Good Penetration Possible Cause...

Страница 62: ...llel and does not cover joint formed by base metal Possible Causes Corrective Actions Unsteady hand Use two hands Practice technique 12 21 Troubleshooting Distortion Distortion contraction of weld met...

Страница 63: ...For GMAW use optional gas valve Voltage Sensing Wire Feeder Constant Current CC Or Constant Voltage CV Power Source Work Lead Electrode Lead Workpiece Work Clamp Voltage Sensing Clamp Gun 802 488 13 2...

Страница 64: ...35 in 40 145 A 50 180 A 035 in Select Wire Speed Select Voltage Wire Recommendation 030 in 035 in 2 in per ampere 1 6 in per ampere Wire Speed 2 x 125 A 250 ipm 1 6 x 125 A 200 ipm Set voltage midway...

Страница 65: ...3 mm past end of nozzle and tip of wire is positioned correctly on seam NOTE 1 Hold Gun and Control Gun Trigger 2 Workpiece 3 Work Clamp 4 Electrode Extension Stickout 1 4 to 1 2 in 6 To 13 mm 5 Cradl...

Страница 66: ...trode extension stickout travel speed thickness of base metal wire feed speed weld current and voltage NOTE Short Normal Long Short Normal Long 10 10 GUN ANGLES AND WELD BEAD PROFILES ELECTRODE EXTENS...

Страница 67: ...nt Along Seam 3 Weave Patterns Use weave patterns to cover a wide area in one pass of the electrode S 0054 A 3 1 2 13 7 Poor Weld Bead Characteristics 1 Large Spatter Deposits 2 Rough Uneven Bead 3 Sl...

Страница 68: ...nsufficient shielding gas at welding arc Increase flow of shielding gas at regulator flowmeter and or prevent drafts near welding arc Remove spatter from gun nozzle Check gas hoses for leaks Place noz...

Страница 69: ...n Incomplete Fusion failure of weld metal to fuse completely with base metal or a preceeding weld bead S 0637 Possible Causes Corrective Actions Workpiece dirty Remove all grease oil moisture rust pai...

Страница 70: ...pport hand on solid surface or use two hands 13 16 Troubleshooting Distortion Distortion contraction of weld metal during welding that forces base metal to move Base metal moves in the direction of th...

Страница 71: ...uminum Short Circuiting Aluminum Argon All Positions5 All Positions Argon 1 O2 Flat Horizontal5 Fillet Flat Horizontal5 Fillet Argon 2 O2 Flat Horizontal5 Fillet Flat Horizontal5 Fillet Argon 5 O2 Fla...

Страница 72: ...s common and not available unless listed Figure 14 1 Main Assembly Onan OHV Engine Shown 42 FIG 14 3 41 39 43 40 44 45 31 28 36 32 37 38 33 34 35 51 50 52 1 2 3 4 9 8 6 5 27 22 21 23 24 26 25 30 13 46...

Страница 73: ...1 F6 021 718 Fuse Mintr Gl 30a 32v 1 180 096 Tune Up Filter Kit Kohler CH 20 1 066 698 Oil Filter 1 121 652 Filter Clamps Fuel 1 067 272 Element Air Cleaner 1 067 273 Air Filter Wrapper 1 067 007 Spar...

Страница 74: ...el Front W Components 1 43 CT1 201 784 Transformer Current Sensing 1 44 177 136 Clamp Capacitor 1 375dia Clip 1 45 C1 199 979 Capacitor Elctlt 1500uf 75vdc Can 1 40 Dia 1 46 D4 135 184 Diode Board 1 4...

Страница 75: ...Onan OHV 4 6 186 083 Screw 437 14x1 75 Hexwhd 93d Gr8 Pld Kohler CH 20 4 7 198 461 Rotor Generator Consisting Of 1 8 181 134 Fan Rotor Gen 1 9 181 143 Bearing Ball Rdl Sgl Row 984 X 2 047 X 59 1 10 2...

Страница 76: ...To Idle 5 Pin 1 7 R1 200 657 Rheostat Ww 150w 14 Ohm 1 8 S2 176 606 Switch Ignition 1 9 RC2 3 141 432 Receptacle Str Dx Grd 2p3w 20a 125vac 2 9 GFCI 2 3 151 981 Receptacle Str Dx Grd 2p3w 15 20a 125va...

Страница 77: ...l 1 21 147 195 Nut 375 27 Nyl 4 22 RC1 182 954 Receptacle Str 3p4w 50a 125 250vac 1 119 172 Plug Str 50a 125 250v 1 23 188 039 Cover Receptacle CSA 1 24 148 956 Handle Switch 2 25 097 924 Knob Pointer...

Страница 78: ......

Страница 79: ...tting Torches Remote Controls Accessory Kits Replacement Parts No labor Spoolmate Spoolguns Canvas Covers Miller s True Blue Limited Warranty shall not apply to 1 Consumable components such as contact...

Страница 80: ...complete and retain with your personal records Always provide Model Name and Serial Style Number Call 1 800 4 A Miller or see our website at www MillerWelds com to locate a DISTRIBUTOR or SERVICE AGEN...

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