Metal Fabrication and Welding is all about joining steel and other materials together and fabricating structures of many different types. In years gone by peoples constructed buildings in timber but today architects are turning more to steel structures and this is where the skills of welding/fabricating come into play.
Steel buildings are long lasting, relatively maintenance free and never attacked by termites. There are many other instances of difficult welding skills such as welding tanks in confined spaces, welding oil pipelines, etc., apart from the more obvious well known uses of welding.