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Ch09-H8070.fm Page 96 Wednesday, October 18, 2006 7:36 AM
96 Ship Construction
steel giving additional heat as in oxy-fuel cutting. The thermal keyholing
gives a narrow straight sided cut compared with the normal cut obtained by
other processes relying on a chemical reaction.

WATER JET CUTTING The cutting tool employed in this process is a
concentrated water jet, with or without abrasive, which is released from a
nozzle at 21/2 times the speed of sound and at a pressure level of several
--- ใช้เพื่อการศึกษาเท่านั้น---
thousand bar. Water jet cutting can be used on a range of materials, tim-
ber, plastics, rubber etc., as well as steels and aluminium alloys. Mild steel
from 0.25 mm to 150 mm in thickness and aluminium alloys from 0.5 mm
งานห้องสมุด ศูนย์ฝกพาณิชย์นาวี
to 250 mm in thickness can be cut. Being a cold cutting process the heat
affected zone, mechanical stresses and distortion are left at the cut
surface.
Waterjet cutting is slower than most thermal cutting processes and is not
a portable machine tool.

Further Reading

Brian D. Smith, ‘Welding Practice’, Butterworth Heinemann, 1996
ึ
‘ESAB advances in welding and cutting technology’, The Naval Architect,
July/August 2003
‘Exploiting friction-stir welding of aluminium’, The Naval Architect, July/
August 2004
‘Modern materials and processes for shipbuilding’ The Naval Architect,
July/August 2005

Some Useful Web Sites

www.esab.com Recommended for informative papers on welding pro-
cesses and practices
www.controlwaterjet.co.uk Use, benefits and capabilities of water jet cutting