Wednesday, September 7, 2016

WHAT IS UNDERWATER WELDING And HOW IT IS PERFORMED

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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