This item is in: Engineering > Marine engineering and underwater welding

Professional diver’s manual on wet-welding

D Keats, Consultant, UK

Versatility, speed and low cost make wet-stick welding an attractive method for use in underwater repair and construction. This training manual and reference book contains step-by-step procedures for performing basic manual metal arc welding operations together with information on welding equipment, consumables and safety. Exercises are included.

ISBN 1 85573 006 5
ISBN-13: 978 1 85573 006 9
October 1990
80 pages  210 x 148mm  paperback  
£45.00 / US$75.00 / €55.00

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An e-book version of this title is available to purchase as part of a Collection or Pick n Mix or by Chapter. Visit Woodhead Publishing Online

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Underwater wet welding and cutting
Non-destructive examination of underwater welded structures
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Developments in marine corrosion
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Contents

Introduction to wet-stick welding
 - Principles of operation
 - Underwater welding techniques
 - Factors in planning underwater welding operations

Equipment
 - Power supply (general)
 - DC generator
 - Drooping characteristic
 - Polarity
 - Setting the current
 - Current ratings
 - Personal equipment
 - Electrode holder
 - Power cables
 - Safety switch

Electrodes
 - Electrodes general
 - Electrode identification
 - Care of electrodes
 - Flux coatings
 - Waterproofing

Health and safety
 - General precautions
 - Precautions checklist
 - Electric shock treatment
 - Diving dress

Welding terminology
 - Welding positions
 - Terms used in welding

Metallurgy
 - Microstructure of wet-welds
 - Microhardness

Defects of underwater welds
 - Dimensional stress
 - Structural discontinuities
 - Defective properties
 - Hydrogen cracking
 - Lamellar tearing
 - Technique defects

Underwater welding process parameters
 - Arc characteristics
 - Travel speed
 - Electrode size and type
 - Water environment and its effects
 - Magnetism
 - Effective demagnetisation techniques

Welder qualifications/welding (procedures)
 - Welder approval qualifications
 - Welding procedure
 - Welding procedure approval

NDT and destructive testing for quality control
 - Visual inspection
 - Magnetic particle inspection
 - Ultrasonic inspection
 - Radiographic inspection
 - Macro inspection
 - Break test
 - Fillet weld fracture test
 - Bend test
 - Hardness test
 - Tensile test

Preparing to weld
 - Joint fit-up
 - Joint preparation
 - Welding current selection
 - Electrode angle
 - Arc length
 - Travel speed
 - Surface cleaning
 - Recording and monitoring
 - Poor fit-up

Index to exercises