A diver welding underwater A diver welding in a tank Diver/welders in the NYD school The staff at the Malaysian underwater welding school Divers in Estonia displaying their underwater welds. Diver preparing to weld underwater David Keats by the hyperbaric chamber at NYD Diver giving the thumbs up

A Welding Quiz From Weldcraft Pro

Knowledge Quiz

Have a go at our fun 'schools-out' knowledge quiz and test your understanding of a range of underwater welding related matters. Not to be taken too seriously, but I hope you find it fun and informative.

Have some fun!


1.0 Arc-eye is a condition caused by exposure to UV light to unprotected eyes?
True
False
2.0 I should always have the welding machine set to DCSP?
True
False
3.0 I can weld underwater with AC current?
True
False
4.0 I am an experienced MMA welder, so I don't need to use simple touch welding techniques?
True
False
5.0 The expression(s) DCSP, DCRP on the front panel of a welding machine refers to polarity?
True
False
6.0 There is no difference between open circuit voltage (OCV) and arc voltage (AV)?
True
False
7.0 A unit of power is expressed as a VOLT?
True
False
8.0 If a unit of power is expressed as a Watt. Is the following statement true? - Amperes x Voltage = Power = Watts?
True
False
9.0 SMAW means shielded metal arc welding and MMA means manual metal arc welding?
True
False
10.0 In welding operations we have two basic currents types, AC and DC. Which type of welding machine will only deliver AC current?
Arc Welder
Transformer
T.I.G
All of the above
11.0 Welding current, as opposed to welding voltage is the only truly independent variable?
True
False
12.0 A welding arc emits three types of non-ionising radiation. Which of the following types is likely to cause arc-eye?
Infra-red
Visible
Ultraviolet (UV)
13.0 Having set the welding machine to DCSP the electrode is connected to the negative pole/terminal?
True
False
14.0 Resistance in any welding circuit cannot be eliminated. However, which of the following do you believe has the greatest effect upon resistance?
Long welding cables
Loose terminal fittings
Type of electrode
15.0 The rate of travel speed used in underwater welding depends upon which of the following?
The size of electrode
The current value
The welding position
The technique used
All of the above
16.0 Magnetic interference when welding with DC current can be a potential difficulty. If you are experiencing magnetic interference, or arc blow, as it's commonly known, which of the following actions might help in reducing its effects?
Reducing the current value
Changing welding direction
Relocation of the return clamp
Sequence welding techniques
All of the above
17.0 Underwater wet welds have a number of problems as compared to dry surface welding, in relation to mechanical properties. The rapid quenching effects produce a structure which is, which of the following?
Highly ductile and malleable
Improved tensile properties
Low ductility, high hardness
All of the above
18.0 Which of the following weld defects is likely when wet welding carbon steels underwater. (Assuming medium carbon structural steels)?
Highly ductile and malleable
Improved tensile properties
Low ductility, high hardness
All of the above
19.0 Welding cables are provided in either copper, or aluminum construction. What are the benefits of copper as compared to aluminum?
Cheaper
Lighter
Improved current carrying capacity and flexibility
All of the above
20.0 Welding cables are provided in either copper, or aluminum construction. What are the benefits of copper as compared to aluminum?
Current carrying capacity
Maximum operating power
Size of machine
All of the above

 

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Image of Welders Mate book "Underwater Wet Welding
- A Welder's Mate"
by David J. Keats
 
The definitive guide for the underwater welder
 
Details and purchase...

 

Image of a diving tank

Image of a diver holding welded steel

Image of a diver welding underwater

Image of a diver preparing to enter the water

Image of a diver preparing to enter the water

Image of a diver welding underwater

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