UNDERWATER WELDING:- Underwater welding refers to a number of distinct welding processes that are performed underwater. The two main categories of underwater welding techniques are wet underwater welding and dry underwater welding, both are classified as hyperbaric welding. In wet underwater welding, a variation of shielded metal arc welding is commonly used, employing a waterproof electrode. Other processes that are used include flux-cored arc welding and friction welding. In each of these cases, the welding power supply is connected to the welding equipment through cables and hoses. The process is generally limited to low carbon equivalent steels, especially at greater depths, because of hydrogen-caused cracking. In dry underwater welding the weld is performed at the prevailing pressure in a chamber filled with a gas mixture sealed around the structure being welded. For this process, gas tungsten arc welding is often used, and the resulting welds are of high integrity
Posted on: Mon, 22 Jul 2013 09:37:29 +0000
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