3M TC330

Our 3M™ roto peen flap assembly does not require a sandblaster or the accompanying abrasive materials, as the tungsten carbide shots are already adhered to the flap. The benefits of this unique construction are twofold. First, peening is cleaner because debris is not released as the flaps abrade the surface. The captive shot flaps provide a more precise method than loose shot blasting. Second, the assembly is portable, making it more convenient for operators to use. Flap/mandrel assemblies are especially effective for precision in-service rework, manufacturing, repair of small areas and peening holes. The 3M™ roto peen flap assembly comes in three sizes and allows for peening a variety of surfaces and radii area. Plus, the UNJForm TC-330 shot size contributes to consistent results. As the part is peened, a compressive residual stress is created. It's a non-yielding layer that increases the material's ability to fight fatigue, stress and fracturing. Flap rotation speed is the most important factor affecting peening intensity. Increasing the speed of rotation increases the intensity. Conversely, decreasing the speed decreases the intensity. To ensure UNJForm peening coverage, operators should use a circular or oscillating motion over the entire area.