Miller Electric MARK VIII-2 manual Preparing Tungsten For DC Electrode Negative Dcen Welding

Page 33

8-2. Preparing Tungsten For AC Or DC Electrode Positive (DCEP) Welding

1

1-1/2 Times

Electrode Diameter

2

1Tungsten Electrode

2Balled End

YUnderstand and follow safety symbols at start of Section 9-1before preparing tungsten.

Ball end of tungsten before welding by applying either an ac amperage slightly higher than what is recom- mended for a given electrode diam- eter (see Section 8-1), or a dc electrode positive amperage.

Ref. S-0161

8-3. Preparing Tungsten For DC Electrode Negative (DCEN) Welding

		1	Tungsten Electrode
1	2	2	Tapered End
		Grind end of tungsten on fine grit,
		hard abrasive wheel before weld-
		ing. Do not use wheel for other jobs
		or tungsten can become contami-
		nated causing lower weld quality.
	2-1/2 Times
	Electrode Diameter
		1	Stable Arc
	1	2	Flat
	1	Diameter of this flat determines
		Diameter of this flat determines
	2	amperage capacity.
	2	3	Grinding Wheel
		3	Grinding Wheel
	3	4	Straight Ground
	4
Ideal Tungsten Preparation − Stable Arc
		1	Arc Wander
	1	2	Point
	1	3	Grinding Wheel
		3	Grinding Wheel
		4	Radial Ground
	2
	3
	4

Wrong Tungsten Preparation − Wandering Arc

Ref. S-0161 / Ref. S-0162

OM-218 Page 29

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Contents Description OM-218From Miller to You Table of Contents Page Marks a special safety message Symbol UsageArc Welding Hazards Electric Shock can killWelding can cause fire or explosion ARC Rays can burn eyes and skinFlying Metal can injure eyes Buildup of GAS can injure or killCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort LES Fumées ET LES GAZ peuvent être dangereuxIndique un message de sécurité particulier Incendie ou une explosion LE Soudage peut provoquer unDES Particules Volantes peuvent blesser les yeux DES Pièces Chaudes peuvent provoquer des brûlures gravesLA Chute DE L’APPAREIL peut blesser Risque D’INCENDIE OU D’EXPLO’EMPLOI Excessif peut SUR DES Organes Mobiles peuvent provoquer des blessuresEn ce qui concerne les stimulateurs cardiaques Principales normes de sécuritéSpecifications − SpecificationsVolt-Ampere Curves Amperes Input at Rated Load Output, 60 HzFor Each Module And Total System Duty Cycle And OverheatingFor Main Transformer OverheatingSelecting a Location And Moving Polyweld System − InstallationMovement Location And AirflowDimensions Dimensions, Weights And Base Mounting Hole LayoutWeight Selecting And Preparing Weld Output CablesWeld Cable Size 150 ft 200 ft 250 ft350 ft 400 ft 15m 30m 45 m 60 m 70 m 90 m 105 m 120 m Connecting To Weld Output Terminals Connecting Weld Output CablesStandard Module Connections Read Safety Blocks at start of -6before proceedingCommon Work Cable Size Separate Work ConnectionsSeparate Work Connections Common Work Parallel Module ConnectionsRemote Contactor Control Connections Optional Remote Amperage Control ReceptacleVolts AC Duplex Receptacle Connecting Input PowerPositioning Jumper Links TE3 TE2Welding Power Source Input Power Con- nections Connecting Input PowerClose and secure access door on welding power source Disconnect Device Input Power Connec- tionsTime-Delay Electrical Service Guide− Operation ControlsPower Switch Push Buttons And Pilot Light Amperage Adjustment ControlsMin 35 a Max 125 a Set Switch Set Desired Maximum Amperage Hz Model ShownRoutine Maintenance − Maintenance & TroubleshootingMonths Overload ProtectionBlank Module Panel Control Fuses F3 And F4Module Fuse Links F11 And F12 Through F81 And F82 Troubleshooting Turn Off polyweld system, and disconnect input powerBefore inspecting, maintaining, or servicing OM-218 Circuit Diagram For Polyweld System − Electrical DiagramSD-082 527-C − Selecting and Preparing Tungsten Electrode Selecting Tungsten ElectrodeAmperage Range Gas Type Polarity Preparing Tungsten For DC Electrode Negative Dcen Welding − Guidelines for TIG Welding Gtaw Positioining The TorchTorch Movement During Welding Butt Weld And Stringer Bead Joint Lap Joint Corner Joint Positioning Torch Tungsten For Various Weld JointsMain Assembly Section a − Parts ListTP1 Main Assembly Section B CR1 194 Panel, Front Module w/Components -1Item Panel, Front Lower w/Components Panel, Front Lower w/Components -1ItemPage 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