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Ultra-cut 400 – Tweco 400 Ultra-Cut User Manual

Page 85

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Manual No. 0-5164

4-11 OPERATION

ULTRA-CUT 400

B. Shield Gases

1. Compressed Air Shield

• Air shield is normally used when operating with air plasma.
• Improves cut quality on some ferrous materials.
• Inexpensive - reduces operating costs.

2. Nitrogen (N2) Shield

• Nitrogen shield is used with Ar/H2

(H35) plasma.

• Provides smooth finishes on nonferrous materials.
• May reduce smoke when used with Ar/H2 plasma.

3. Water Shield

• Water shield should be used only in mechanized applications - never in hand cutting!
• Normally used with nitrogen, Ar/H2, or air plasma.
• Provides very smooth cut surface.
• Reduces smoke and heat input to the workpiece.
• Effective up to 1/2 inch (12.7 mm) maximum material thickness.
• Tap water provides low operating expense.