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These can be attained by completing an intensive training and certification program... Today, The skill of welding * is vital in the areas of Commerce, National Defense , Aerospace Video, Shipbuilding, Transportation, Building and Bridge Construction, Commercial Equipment, Industrial Apparatus and Ornamental Iron & Fabrication Shops... Welding is a job skill used within many trades to manufacture, construct, produce, fabricate and / or repair objects of metal. Welding is not a trade! it is a skill.