Hobart Welding Products 250A manual Sequence Of Operation, 197 196

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5-3. Sequence Of Operation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EXAMPLE Of Cutting Operation

. Moisture from the compressor will form in the air line and at

 

 

 

 

 

 

 

the torch. It will be normal to sometimes see moisture come

 

 

 

 

 

 

 

out the end of the torch.

The pilot arc starts immediately when trigger is pressed.

For shielded cutting, place drag shield on edge of metal. For non-shielded cutting, use 1/8 in (3.2 mm) standoff distance (dragging tip will reduce tip life).

Adjust torch speed so sparks go thru metal and out bottom of cut.

Raise trigger lock and press

trigger. Pilot arc starts.

Pause briefly at end of cut before releasing trigger.

After cutting arc starts, slowly start moving torch across metal.

Postflow continues for approx. 12 seconds after releasing trigger; cutting arc can be in- stantly restarted during postflow by raising trigger lock and pressing trigger.

As a convenience, the torch can be set up with two cutting combinations, either drag or non-shielded cutting. The torch comes standard with drag cutting.

.Maximum performance on thicker materials can be obtained by using non-shielded cutting with a 1/16 - 1/8 in (1.6 - 3.2 mm) standoff.

Drag Cutting

Use retaining cup (197 567) and drag shield (196 929) to obtain a 1/16 in (1.6 mm) standoff automatically. This combination is designed to allow dragging the torch directly on the workpiece.

Use shields for ease of use when cutting with a template, or when drag cutting is preferred.

197 567

196 929

Non-Shielded Cutting

Use retaining cup (196 928) and hold a 1/16-1/8 in (1.6-3.2 mm) standoff between the workpiece and cutting tip.

Use non-shielded when visually following a line.

. This combination can be used for drag cutting but does not provide optimum cutting performance on thicker material.

196 926

196 928

1/16-1/8 in (1.6-3.2 mm)

standoff

workpiece

801 400-A

OM-928 Page 14

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Contents Processes DescriptionFrom Hobart to You Table of Contents Page Plasma Arc Cutting Hazards Symbol UsageMarks a special safety message Cutting can cause fire or explosionARC Rays can burn eyes and skin Exploding Parts can injureFlying Sparks can cause injury Noise can damage hearingCalifornia Proposition 65 Warnings Principal Safety Standards EMF InformationAbout Pacemakers UNE Décharge Électrique peut entraîner la mort Signification des symbolesLE Coupage présente un risque de feu ou d’explosion Identifie un message de sécurité particulierLES Fumées ET LES GAZ peuvent être dangereux Risque de blessure en casLE Bruit peut endommager l’ouïe LE Plasma D’ARC peut entraîner des blessuresDES Organes Mobiles peuvent provoquer des blessures LES Bouteilles peuvent exploser si elles sont endommagéesDES Pieces Chaudes peuvent pro- voquer des brûlures graves DES Particules Volantes peuvent blesser les yeuxPrincipales normes de sécurité Information sur les champs électromagnétiquesConsignes relatives aux stimulateurs cardiaques − Definitions I1maxI1eff Specifications For Torch − InstallationSpecifications For Power Source Duty Cycle And OverheatingSelecting a Location Torch Dimensions And WeightDimensions And Weight Movement Location And AirflowConnecting Work Clamp Connecting Input PowerTrigger Safety Lock − OperationControls Pilot arc starts immediately when trigger is pressed Sequence Of Operation197 196 − Maintenance & Troubleshooting MonthsTrouble Light And Checking Shield Cup Shutdown System Checking Torch Shield Cup Shutdown SystemTorch And Work Cable Connections Torch ConnectionsWork Cable Connections Turn Off power source before checking torch parts Checking/Replacing Retaining Cup, Tip, And ElectrodeTroubleshooting Power Source Troubleshooting Torch − Electrical Diagram Circuit Diagram− Parts List Main AssemblyDia Part Description Quantity Mkgs Ring Ring 196935 196929 197567 196926 196925 196927Cup 196928 Page Page Service SupportAssistance Contact your Distributor for Hobart Welding Products
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