![]() ![]() And each step (finer grit) removes the deeper scratches from the previous step and replaces them with smaller scratches.īecause grinding and finishing have different goals, they often do not complement one another and, with the wrong consumable strategy, actually can work against each other. The goal is to achieve a certain final finish (scratch pattern). But in grinding, scratches are just the aftereffect quick material removal is the goal, especially when working with heat-sensitive metal like stainless steel.įinishing occurs in steps as the operator starts with a larger grit and steps down to finer-grit sanding discs, nonwoven abrasive, and perhaps a felt cloth and polishing paste to achieve a mirror finish. The confusion is understandable, considering those grinding with a large-grit wheel remove a lot of metal quickly and in so doing leave a “finish” of very deep scratches. Grinding removes material like burrs and excess weld metal, while finishing puts a finish on the metal surface. 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 Glue is used to bond the material to the B-paper of the abrasive roll PL 31 B.To ensure proper passivation, a technician electrochemically cleans a longitudinal weld seam in a rolled section of stainless steel. Its tremendous hardness makes this mineral the preferred choice for many products, e.g. Hard, tough and effective – that is aluminium oxide in a nutshellĪluminium oxide is a widely used abrasive, also used by Klingspor for the abrasive roll PL 31 B. ![]() You then proceed with a succession of finer grit sizes until you produce the desired result. You start off by working with a coarse grit first. It is advisable to break up the grinding process into multiple steps to ensure optimum efficiency and perfect results. While a coarse grit is primarily recommended for smoothing out surfaces or chamfering edges, a fine grit - 220 or higher - is the grit of choice for surface finishing. The abrasive roll PL 31 B can produce coarser or exceptionally smooth surfaces depending on the selected grit. This technology is a particularly good choice for all applications on hard wood, varnish, paint and fillers. It also delivers exceptional grinding performance at only moderate stock removal. The semi-open coating ensures that the swarf is cleanly removed from the surface. This allows the user to adjust it perfectly to the job at hand. It can be effortlessly torn off in the size needed. This abrasive on a roll is suitable for universal use.
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