Miller Electric XMT 400 manual Lift-Arc TIG Procedure, Touch Seconds Do not Strike Like a Match

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5-4. Lift-Arc TIG Procedure

1 2

1 − 2

“Touch” Seconds

Do NOT Strike Like A Match!

With Process Switch in the Lift-Arc TIG position, start an arc as follows:

1TIG Electrode

2Workpiece

Touch tungsten electrode to work- piece at weld start point, hold electrode to workpiece for 1-2 seconds, and slowly lift electrode. An arc will form when electrode is lifted.

Normal open-circuit voltage is not present before tungsten electrode touches workpiece; only a low sensing voltage is present between electrode and workpiece. The solid-state output contactor does not energize until after electrode is touching workpiece. This allows electrode to touch workpiece with- out overheating, sticking, or getting contaminated.

Ref. S-156 279

Notes

OM-217 769 Page 23

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Contents File Multiprocess OM-217 769LProcesses DescriptionFrom Miller to You Table of Contents Page HOT Parts can cause severe burns Symbol UsageArc Welding Hazards Electric Shock can killFlying Metal or Dirt can injure eyes Fumes and Gases can be hazardousARC Rays can burn eyes and skin Welding can cause fire or explosionMoving Parts can cause injury Welding Wire can cause injuryFire or Explosion hazard Falling Unit can cause injuryAbout Implanted Medical Devices Principal Safety StandardsCalifornia Proposition 65 Warnings EMF InformationUNE Décharge Électrique peut entraîner la mort Symboles utilisésDES Pièces Chaudes peuvent provoquer des brûlures graves LES Fumées ET LES GAZ peuvent être dangereuxLE Soudage peut provoquer un in cendie ou une explosion LA Chute DE L’APPAREIL peut blesser LE Bruit peut endommager l’ouïeLES Bouteilles peuvent exploser si elles sont endommagées Risque D’INCENDIE OU D’EXPLO- SionProposition californienne 65 Avertissements LES Fils DE Soudage peuvent provoquer des blessuresLE Soudage À L’ARC risque de provoquer des interférences Principales normes de sécurité Information EMFEn ce qui concerne les implants médicaux OM-217 769 Disconnect input plug or power before working on machine Manufacturer’s Warning Label DefinitionsKeep your head out of the fumes 60 s I1eff Symbols And DefinitionsManufacturer’s Rating Label I1maxDuty Cycle And Overheating SpecificationsCC Mode CV ModeVolt-Ampere Curves Selecting a Location Dimensions And WeightOutput Receptacles Weld Output Terminals And Selecting Cable SizesARC Welding can cause Electromagnetic Interference 350 ft 400 ft Put terminalsRemote 14 Receptacle Information Electrical Service GuideConnecting 3-Phase Input Power To a line terminal For Three-Phase OperationYellow Conductor Inductance/Dig Control Power On/Off SwitchSelect setting best suited for application Front Panel ControlsMeter Functions Mode Switch Settings Touch Seconds Do not Strike Like a Match Lift-Arc TIG ProcedureBlowing Out Inside Of Unit Do not remove case when blowing out inside of unitVoltmeter/Ammeter Help Displays Remote 14 receptacle TroubleshootingCheck, repair, or replace remote control Reset circuit breaker CB1− Electrical Diagram − Parts List Dia Part Description Quantity PC3 219 Service Your distributor also givesSupport Your distributor and/or equipment manufacturer’s To locate a Distributor or Service Agency visitMiller Electric Mfg. Co For assistance in filing or settling claims, contact