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OM-1325 204 902J January 2004 Processes MIG (GMAW) Welding Flux Cored (FCAW) Welding Description Arc Welding Power Source and Wire Feeder Millermatic 210 And M-25 Gun Visit our website at www.MillerWelds.com...
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We know you don’t have time to do it any other way. That’s why when Niels Miller first started building arc welders in 1929, he made sure his products offered long-lasting value and superior quality.
SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING som _8/03 1-1. Symbol Usage Means Warning! Watch Out! There are possible hazards with this procedure! The possible hazards are shown in the adjoining symbols. This group of symbols means Warning! Watch Out! possible Y Marks a special safety message.
ARC RAYS can burn eyes and skin. BUILDUP OF GAS can injure or kill. D Shut off shielding gas supply when not in use. Arc rays from the welding process produce intense D Always ventilate confined spaces or use visible and invisible (ultraviolet and infrared) rays that can burn eyes and skin.
1-3. Additional Symbols For Installation, Operation, And Maintenance FIRE OR EXPLOSION hazard. MOVING PARTS can cause injury. D Do not install or place unit on, over, or near D Keep away from moving parts such as fans. combustible surfaces. D Keep all doors, panels, covers, and guards D Do not install unit near flammables.
1-5. Principal Safety Standards Safety in Welding, Cutting, and Allied Processes, ANSI Standard Z49.1, Boulevard, Rexdale, Ontario, Canada (phone: from American Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126 800−463−6727 or in Toronto 416−747−4044, website: www.csa−in- (phone: 305-443-9353, website: www.aws.org). ternational.org).
SECTION 2 − CONSIGNES DE SÉCURITÉ − À LIRE AVANT UTILISATION som_fre 8/03 2-1. Signification des symboles Signifie « Mise en garde. Faire preuve de vigilance. » Cette procédure présente des risques identifiés par les symboles adjacents aux directives. Ce groupe de symboles signifie « Mise en garde. Faire preuve de vigi- Y Identifie un message de sécurité...
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LES RAYONS DE L’ARC peuvent cau- LES ACCUMULATIONS DE GAZ peu- ser des brûlures oculaires et cuta- vent causer des blessures ou même nées. la mort. Le rayonnement de l’arc génère des rayons visibles et D Couper l’alimentation en gaz protecteur en cas de invisibles intenses (ultraviolets et infrarouges) suscep- non utilisation.
2-3. Autres symboles relatifs à l’installation, au fonctionnement et à l’entretien de l’appareil. Risque D’INCENDIE OU D’EXPLO- LES ORGANES MOBILES peuvent SION causer des blessures. D Ne pas placer l’appareil sur une surface inflam- D Se tenir à l’écart des organes mobiles comme les mable, ni au−dessus ou à...
2-4. Principales normes de sécurité Safety in Welding, Cutting, and Allied Processes, norme ANSI Z49.1, Rexdale, Rexdale (Ontario) Canada M9W 1R3 (téléphone : (800) de l’American Welding Society, 550 N.W. LeJeune Rd, Miami FL 33126 463−6727 ou à Toronto : (416) 747−4044, site Web : www.csa−interna- (téléphone : (305) 443−9353, site Web : www.aws.org).
SECTION 3 − DEFINITIONS 3-1. Symbols And Definitions Do Not Switch Wire Feed Output Duty Cycle While Welding Volts Increase Gas Metal Arc Wire Feed Spool Welding (GMAW) Gas Input Gas Output Rated No-Load Voltage Input Press To Reset Voltage (Average) SECTION 4 −...
4-2. Welding Power Source Duty Cycle And Overheating Duty Cycle is percentage of 10 min- utes that unit can weld at rated load without overheating. If unit overheats, thermostat(s) opens, output stops, and cooling fan runs. Wait fifteen minutes for unit to cool.
4-4. Volt-Ampere Curves Volt-ampere curves show minimum and maximum voltage and amper- age output capabilities of unit. Curves of other settings fall be- tween curves shown. va_curve1 4/95 − 192 436 4-5. Installing Work Clamp Work Cable Boot Route cable through front panel opening.
4-7. Connecting An Optional Spool Gun Barbed Fitting If spool gun gas hose is equipped with a pre-installed barbed fitting, cut off fitting from end of hose. Connect spool gun gas hose to barbed fitting. Gun Trigger Plug Insert plug into receptacle labeled “SPOOL GUN”, tighten...
4-9. Installing Gas Supply Obtain gas cylinders and chain to running gear, wall, or other stationary support so cylinders cannot fall and break off valve. DO NOT use Argon/Mixed gas regulator/flowmeter Cylinder Valve with CO shielding gas. See Parts List for optional gas regulator/flowmeter.
4-10. Installing MIG Wire Spool and Adjusting Hub Tension Use compression spring When a slight force is needed with 8 in (200 mm) spools. to turn spool, tension is set. To install either a 1 lb or 2 lb wire Installing 1 Or 2 lb Wire Spool spool, follow the procedure as Spindle...
4-11. Positioning Jumper Links Check input voltage available at site and listed on the machine rating label. Jumper Links Access Door Open door. Jumper Link Label Check label − only one is on unit. Input Voltage Jumper Links 200 VOLTS 230 VOLTS Move jumper links to match input voltage.
4-13. Selecting A Location And Connecting Input Power Rating Label Supply correct input power. Plug (NEMA Type 6-50P) Receptacle (NEMA Type 6-50R) Connect plug to receptacle. Input And Grounding 18 in (457 mm) of Y Do not move or operate unit Conductors space for airflow where it could tip.
4-15. Using Gun/Cable Holder Side Panel Latch Cable Holder Press latch down to release and open door. Holster (2) Wrap cable around cable holder, and place gun nozzle into holster. 802 726 OM-1325 Page 18 Return To Table Of Contents...
SECTION 5 − OPERATION 5-1. Controls Ref. 200 034-B Voltage Control Wire Speed Control Power Switch This switch energizes the main transformer Set Wire Speed control according to the and control circuitry. Set Voltage control according to the parameter chart. Increase or decrease wire parameter chart for good starting point.
5-2. Weld Parameter Chart *Line voltage can affect weld output, settings on this chart are starting values only. You may need to adjust voltage and wire feed speed to optimize your settings. Input Line Parameter Voltage* Chart Settings Higher Weld Will Be e.g.
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204 890 Return To Table Of Contents OM-1325 Page 21...
SECTION 6 − MAINTENANCE &TROUBLESHOOTING 6-1. Routine Maintenance Maintain more often Y Disconnect power during severe conditions. before maintaining. 3 Months Replace unreadable labels Repair or replace cracked weld cable Clean and tighten weld terminals 6 Months Remove drive roll and Blow out or vacuum inside.
6-4. Replacing Gun Contact Tip Y Turn Off power. Nozzle Contact Tip Cut off welding wire at contact tip. Remove nozzle. Remove contact tip and install new contact tip. Reinstall nozzle. Tools Needed: Ref. 800 797-C 6-5. Changing Drive Roll and Wire Inlet Guide Securing Screw Inlet Wire Guide Loosen screw.
6-6. Aligning Drive Rolls and Wire Guide Y Turn Off power. View is from top of drive rolls look- ing down with pressure assembly open. Drive Roll Securing Nut Correct Incorrect Drive Roll Wire Guide Welding Wire Drive Gear Insert screwdriver, and turn screw in or out until drive roll groove lines up with wire guide.
6-8. Cleaning Or Replacing Gun Liner Tools Needed: Y Disconnect gun from unit first. 5/16 in, 10 mm Head Tube Remove nozzle, contact tip, and adapter. 5/16 in 10 mm Remove liner. Lay gun cable out straight before installing new liner. To Reassemble Gun: Blow out gun casing.
6-9. Replacing Switch And/Or Head Tube Y Disconnect gun first. Remove handle locking nut. Slide handle. Remove switch housing. Note: If installing new switch, push switch lead connectors onto terminal of new switch (polarity is not important). Install switch back into handle, and secure with handle locking nut. If replacing head tube, continue to end of figure.
6-10. Troubleshooting Welding Trouble Remedy No weld output; wire does not feed. Secure power cord plug in receptacle (see Section 4-13). Check and replace power switch if necessary. Check circuit breaker CB1, and reset if necessary (see Section 6-2). Replace building line fuse or reset circuit breaker if open (see Section 4-13). Secure gun plug in receptacle or repair leads, or replace trigger switch (see Section 4-6 and/or 6-9).
SECTION 8 − MIG WELDING (GMAW) GUIDELINES 8-1. Typical MIG Process Connections Y Weld current can damage electronic parts in vehicles. Disconnect both battery cables before welding on a Regulator/ vehicle. Place work clamp as Flowmeter close to the weld as possible. Shielding Supply Hose...
8-2. Typical MIG Process Control Settings NOTE These settings are guidelines only. Material and wire type, joint design, fitup, position, shielding gas, etc. affect settings. Test welds to be sure they comply to specifications. Material thickness determines weld parameters. 1/8 or Convert Material .125 in Thickness to...
8-3. Holding And Positioning Welding Gun NOTE Welding wire is energized when gun trigger is pressed. Before lowering helmet and pressing trigger, be sure wire is no more than 1/2 in (13 mm) past end of nozzle, and tip of wire is positioned correctly on seam. Hold Gun and Control Gun Trigger Workpiece...
8-4. Conditions That Affect Weld Bead Shape NOTE 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. ° Push ° Perpendicular Drag GUN ANGLES AND WELD BEAD PROFILES Short Normal Long...
8-5. Gun Movement During Welding NOTE Normally, a single stringer bead is satisfactory for most narrow groove weld joints; however, for wide groove weld joints or bridging across gaps, a weave bead or multiple stringer beads works better. Stringer Bead − Steady Movement Along Seam Weave Bead −...
8-8. 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.
8-11. Troubleshooting − Lack Of Penetration Lack Of Penetration − shallow fusion between weld metal and base metal. Lack of Penetration Good Penetration S-0638 Possible Causes Corrective Actions Improper joint preparation. Material too thick. Joint preparation and design must provide access to bottom of groove while maintaining proper welding wire extension and arc characteristics.
8-14. Troubleshooting − Waviness Of Bead Waviness Of Bead − weld metal that is not parallel and does not cover joint formed by base metal. S-0641 Possible Causes Corrective Actions Welding wire extends too far out of nozzle. Be sure welding wire extends not more than 1/2 in (13 mm) beyond nozzle. Unsteady hand.
8-16. Common MIG Shielding Gases This is a general chart for common gases and where they are used. Many different combinations (mixtures) of shielding gases have been developed over the years. The most commonly used shielding gases are listed in the following table.
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Problem Probable Cause Remedy Welding arc not stable. Wire slipping in drive rolls. Adjust pressure setting on wire feed rolls. Replace worn drive rolls if necessary. Wrong size gun liner or contact tip. Match liner and contact tip to wire size and type. Incorrect voltage setting for selected wire feed speed on Readjust welding parameters.
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Notes Return To Table Of Contents OM-1325 Page 39...
SECTION 9 − PARTS LIST Hardware is common and not available unless listed. 802 993-C Figure 9-1. Main Assembly OM-1325 Page 40 Return To Table Of Contents...
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Item Dia. Part Mkgs. Description Quantity Figure 9-1. Main Assembly ....Fig 9-2 BAFFLE,CENTER ...........
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Hardware is common and not available unless listed. 802 989-A Figure 9-2. Baffle, Center w/Components OM-1325 Page 42 Return To Table Of Contents...
9-7. Drive Roll And Wire Guide Kits Note Base selection of drive rolls upon the following recommended usages: V-Grooved rolls for hard wire. U-Grooved rolls for soft and soft shelled cored wires. U-Cogged rolls for extremely soft shelled wires (usually hard surfacing types). V-Knurled rolls for hard shelled cored wires.
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Effective January 1, 2003 (Equipment with a serial number preface of “LC” or newer) This limited warranty supersedes all previous Miller warranties and is exclusive with no other Warranty Questions? guarantees or warranties expressed or implied. Call LIMITED WARRANTY − Subject to the terms and conditions Induction Heating Coils and Blankets below, Miller Electric Mfg.
Distributor Address City State For Service Call 1-800-4-A-Miller or see our website at www.MillerWelds.com to locate a DISTRIBUTOR or SERVICE AGENCY near you. Always provide Model Name and Serial/Style Number. Contact your Distributor for: Welding Supplies and Consumables Options and Accessories...