A Customized fabrication steel product is only as good as the weld that keeps it together. Not only is it important for an engineer to determine the proper weld to use, but also the welding technique to implement. That can be a little trickier. Metal fabrication is the creation of metal structures by cutting, bending, and assembling processes. It is a value-added[1] process involving the creation of machines, parts, and structures from various raw materials.Typically, a fabrication shop bids on a job, usually based on engineering drawings, and if awarded the contract, builds the product. Large fab shops employ a multitude of value-added processes, including welding, cutting, forming and machining.