Underwater welding
consists of several methods used for repairing ships, pipelines and offshore
oil platforms. Underwater welding splits into two main categories: wet and dry
underwater welding. Both fall under hyperbaric welding, which is welding done
at increased pressure, such as being underwater. Underwater welding uses steel
for repairs.
Dry underwater
welding is done by placing a structure around the point to be welded. The
structure is sealed around the weld point and gas fills the area created by
this juncture. The welding then begins inside the chamber. Dry underwater
welding is considered to be very accurate in its final product.
Wet underwater
welding uses waterproof electrodes to supply power to the welding tools. Wet
underwater welding is considered to be easier to initiate due to the lack of
preparing the dry welding's chamber. Wet welding also allows for more freedom
of movement by the welder.
Wet underwater
welding has more risks than dry underwater welding. One such risk to the welder
is from electrocution. The equipment used must be insulated and electricity
must be properly maintained. In addition to electrocution, welders must be
concerned with diving issues and the possible build-up of oxygen and hydrogen
gases, which can be explosive
Here is the video that illustrating about underwater welding
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