(2024 Exam) UnderWater Cutting and Welding Flashcards
Ch 3, 4, 5.
What is the COA when a pop is heard while cutting or welding?
Stop all cutting and welding work and investigate the cause.
Can you substitute compressed air for O2 in U/W cutting?
No, due to the dangers of contaminating O2 regulators and hoses with oil residue.
what is the preferred current used for U/W cutting and welding?
DC.
A/C power shall NOT be used.
What is the O2 purity standards for cutting?
O2 cutting should be 99.5% or greater.
To ensure sufficient O2 flow, a high flow regulator capable of delivering ___CFM is necessary?
70 CFM
What is the over bottom pressure for cutting?
90PSI. Computed for depths up to 300ft.
Only ___ type clamps should be used as grounding clamps?
C type
What is the formula for calculating Regulator pressure setting for O2?
H/10 + (0.445 * D) +90
(Where H is hose length.)
Steel plate 1/4” thick or greater should be cut using the ____ ______?
Drag Technique
The hand should never be any closer than ___” from the electrode tip?
4”
While holding the electrode _______, how long should the Diver visually check O2 flow from the electrode?
Horizontal, 20 seconds.
When the electrode has been consumed to within ___” of the torch, stop the cut and call for switch off.
3”
Exothermic Electrodes
It is not safe to operate the torch without the _______ ________ installed?
Flashback arrestor.
3/8” electrodes is ___” or ___” long. The ultrathermic electrode will melt almost any material with it’s _______ degree F plus, tip heat.
18” or 36” , 10,000 degree.
The Sea-Jet electrode will operate on a wide range of amp settings up to ____amps? With optimum cutting results with ____-____ amps.
400amps, 200-300amps.
Gauntlet-type gloves worn over a pair of _____-____ gloves afford the best protection. In cold water, ______ gloves, worn over _______ gloves are equally effective?
Playtex-type, Diving, Surgical.
Hold the electrode at a ___ to ___ degree angle?
45 to 90 degree. depending on material thickness.
A ___” minimum oxygen emission should be maintained at the electrode tip?
6”
Burning the electrode shorther than ___” can damage the torch interior?
3”
For Kerie Cable, set the oxygen pressure to about ____psi and turn the Hoke valve to the ON position?
200psi.
What are the disadvantages of Kerie Cable?
1) It requires more O2
2) It will not cut concrete, rock, or non-ferrous metals.
In an emergency situation, what position do you turn the HOKE valve to instantly stop the cable from burning?
Turn to Vent.
It is important that ignition NOT occur during what situation, that would cause the flame to burn sideways along the length of the cable?
When O2 pressure is too low.
How far from the flame should you keep your hand when cutting with Kerie Cable?
6”
