Tweco Dynamics Automation - Manual (Page 15)

Considerations:
• Water supply should be at least 55 psi.
• Hard water will leave mineral deposits, just as it does in sinks and faucets. A standard
water softening filter will prevent mineral deposits that can interfere with water flow in the
torch passages.
• Ohmic sensing to establish initial torch height is ineffective when water is present.
The ohmic clip should be removed from the torch for N2/WMS cutting. The ohmic sensing
system will sense the level of any water on the plate rather than the true position of the plate.
Underwater Cutting
Cutting under water is used by some operators to capture smoke and reduce flash and noise.
Cutting under water is possible with Ultra-Cut and Auto-Cut systems.
Considerations:
• Cutting under water will reduce cut capacity and speed by up to 30%
• The cooling effect of water on the bottom of the plate will facilitate formation of dross
• Cutting aluminum under or over water releases hydrogen, which can explode
• Cutting with N2/WMS process is not recommended
• The water in the table will become contaminated with cut residue and can be a toxic waste
N2/Water Mist Secondary ®™
In this process, tap water is used instead of a shield gas. The water is vaporized as
it passes through the torch head and a portion of the molecules separate onto hydrogen and
oxygen. This vapor protects the cut surface from ambient air contamination and eliminates
nitriding in the cut surface.
Cutting with the N2/WMS process is economically efficient and produces genuine
precision cut quality over a broad range of non-ferrous applications.
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