The commercial diver is known as an underwater welder. Like a welder, they also do the same kind of work but in the elevated underwater pressure. It was first invented by Konstantin Khrenov in the year 1932. Now, it is an important field of work in major oil platforms, damaged ships and repair-needy pipeline works. This job is done in two ways. One is the underwater welder job happens directly inside the water. Another one is dry hyperbaric welding job which takes place outside of water that is in a dry environment enclosed in a positive chamber. For a quality welding, the wet underwater welding has preferred.