In fact, each has a fundamentally different goal. How can fabricators prevent all this? They can start by developing a knowledge of grinding and finishing, what role each plays, and how each affects a stainless steel workpiece. Add complications like contamination and passivation failure, and a once profitable stainless steel job can become a money-losing, even reputation-losing misadventure. Add an expensive, heat-sensitive material like stainless steel, and costs for rework and scrap mount even more. Mistakes in finishing can be extraordinarily expensive, considering all the value that’s already been put into the workpiece. Usually performed manually, grinding and finishing require dexterity and finesse. In this case this means the part won’t meet customer requirements. Then, alas, some significant bluing emerges on the surface-a telltale sign of excessive heat input. So the grinder spends time removing a bit more weld metal than usual. The weld looks OK, but it’s not the stack-of-dimes perfection the customer is looking for. The part consists of a plate welded vertically to a tube. Sheet metal and tubular sections flow through cutting, bending, and welding, then land at the finishing station. Imagine a fabricator lands a contract involving critical stainless steel fabrication. Images provided by Walter Surface Technologies To ensure proper passivation, a technician electrochemically cleans a longitudinal weld seam in a rolled section of stainless steel.
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