In this
technical world where we are facing new technologies daily. The unbelievable science
discoveries are being invented. This topic is also about such a technology which
is almost unbelievable. We are going to discuss the underwater welding. It is
also known as hyperbaric welding. Hyperbaric is generally referred to a process
done at higher pressure. Underwater welding can be said as a type of hyperbaric
welding as the process is done under the pressure of water.
For this
operation skilled and experienced welder is needed to get a good quality
welding. Because there are always chances of welding defects and weakness in welding
joints to occur in the welding done at under water. These problem occurs due to
gas emission in welding which cools suddenly in the water and creates problems
of defects. Even with these problems, a good quality underwater welding can be
achieved.
The underwater
welding is subdivided into two parts i.e. dry welding and wet welding.
What is Dry welding: -
The term hyperbaric is generally used for dry underwater welding. This type
of underwater welding is used more than the wet type of underwater welding. This
process can be performed at a good range of pressure without compromising with
the quality of the welding.
In this
process an arrangement is done, according to which a chamber is with a mixture
of gas inside (inert gas should be used with oxygen), around at the place where
welding is performed. By this method a dry atmosphere is created under water. It
is a safe method of underwater welding. Many methods of welding can be used,
but they fails at high hydrostatic pressure. Gas tungsten arc welding process a
used mostly, because if can perform the desired task at the high hydrostatic
pressure.
This method allows the operator to monitor the
quality easily. It facilitate to perform the testing such as non-destructive
testing.
Wet Underwater Welding: -
This is the welding which is done in the wet condition i.e. the
whole system is exposed to the water. The metal arc method is used with constant
current supply. For a safe environment extraordinary isolation is required.
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