Table of Contents

Miller Electric HF-251-2, HF-251D-1 manual Table of Contents

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SECTION 1 − SAFETY PRECAUTIONS - READ BEFORE USING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1-1.	Symbol Usage	1
1-2.	Arc Welding Hazards	1
1-3. Additional Symbols For Installation, Operation, And Maintenance		3
1-4. California Proposition 65 Warnings		3
1-5.	Principal Safety Standards	4
1-6.	EMF Information	4
SECTION 2 − CONSIGNES DE SÉCURITÉ − À LIRE AVANT UTILISATION		5
2-1.	Signification des symboles	5
2-2. Dangers relatifs au soudage à l’arc		5
2-3. Autres symboles relatifs à l’installation, au fonctionnement et à l’entretien de l’appareil		7
2-4. Principales normes de sécurité		8
2-5. Information sur les champs électromagnétiques		8
SECTION 3 − INSTALLATION		9
3-1.	Specifications	9
3-2.	Typical Process Connections	9
3-3.	Installing Gas Supply	10
3-4. Power Source Plug Information And Connections		11
3-5. Operator Control Receptacle Information And Connections		12
3-6. Operator Control Receptacle Socket Information		12
3-7. Connecting To Weld Output Terminals		13
3-8.	Connecting Input Power	14
SECTION 4 − OPERATION		15
4-1.	Controls	15
4-2.	High Frequency Switch	15
4-3. High Frequency Selector Switch		15
4-4. High Frequency Intensity Control		16
4-5. Power Switch And Pilot Light		16
4-6.	Postflow Timer	16
4-7.	Shielding Gas	16
SECTION 5 − MAINTENANCE & TROUBLESHOOTING		17
5-1.	Routine Maintenance	17
5-2.	Adjusting Spark Gaps	18
5-3.	Troubleshooting	19
SECTION 6 − ELECTRICAL DIAGRAMS		20
SECTION 7 − HIGH FREQUENCY		22

7-1. Welding Processes Requiring High Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7-2. Incorrect Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

7-3. Correct Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

SECTION 8 − SELECTING AND PREPARING TUNGSTEN ELECTRODE FOR DC OR AC WELDING . . . . 24

8-1. Selecting Tungsten Electrode (Wear Clean gloves To Prevent Contamination Of Tungsten) . . . . . . . . 24

8-2. Preparing Tungsten Electrode For Welding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SECTION 9 − GUIDELINES FOR TIG WELDING (GTAW)		25
9-1.	Positioning The Torch	25
9-2.	Torch Movement During Welding	26
9-3.	Positioning Torch Tungsten For Various Weld Joints	26
SECTION 10 − PARTS LIST		28
OPTIONS AND ACCESSORIES
WARRANTY

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Contents

OM-611 ProcessesDescription From Miller to You Table of Contents Page Electric Shock can kill Symbol UsageMarks a special safety message Arc Welding HazardsBuildup of GAS can injure or kill ARC Rays can burn eyes and skinWelding can cause fire or explosion Flying Metal can injure eyesCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers − Consignes DE Sécurité − À Lire Avant Utilisation Identifie un message de sécurité particulierLE Bruit peut affecter l’ouïe LE Soudage peut causer un incen- die ou une explosionLES Particules Projetées peu- vent blesser les yeux LES Pièces Chaudes peuvent cau- ser des brûlures gravesLES Pièces Mobiles peuvent cau- ser des blessures Risque D’INCENDIE OU D’EXPLOLA Chute DE L’APPAREIL peut blesser ’EMPLOI Excessif peut FairePrincipales normes de sécurité Information sur les champs électromagnétiquesConsignes relatives aux stimulateurs cardiaques − Installation SpecificationsTypical Process Connections IN-GAS-OUT Installing Gas SupplyAmperage Control Power Source Plug Information And ConnectionsOperator Control Receptacle Information And Connections Operator Control Receptacle Socket InformationSocket Electrode Electrode OUT Work INPUT/OUTPUT Connecting To Weld Output TerminalsConnecting Input Power Controls High Frequency SwitchHigh Frequency Selector Switch − OperationShielding Gas Power Switch And Pilot LightPostflow Timer High Frequency Intensity ControlRoutine Maintenance Months − Maintenance & TroubleshootingAdjusting Spark Gaps Trouble Remedy TroubleshootingCircuit Diagram For 115 Volts Model − Electrical DiagramsCircuit Diagram For 230 Volts Model Weld Zone Incorrect Installation− High Frequency Welding Processes Requiring High FrequencyCorrect Installation Metal BuildingMetal Building Requirements AC − Argon AC − Argon − Amperage Range Gas Type PolarityPreparing Tungsten For Conventional AC Welding − Guidelines for TIG Welding GtawPreparing Tungsten Electrode For Welding Positioning The TorchTungsten With Filler Rod Torch Movement During WeldingPositioning Torch Tungsten For Various Weld Joints Tungsten Without Filler RodReturn To Table Of Contents Complete Assembly Part 1 of 2 115V Model − Parts ListComplete Assembly Part 1 Complete Assembly Part 2 of 2 115V Model Complete Assembly Part 2 Page Page Page Support ServiceMiller Electric Mfg. Co Owner’s Record

Miller Electric HF-251-2, HF-251D-1 manual Table of Contents