Assuming the dominant Rayleigh scattering mechanism (1) the wave would be sensitive to a minimum scatterer size of 300 μm, ie 1/10 of the wavelength. The transducer frequency was set at 2 MHz, generating a longitudinal wave with a wavelength of ~3 mm. The scanning resolution impacts on the time taken to generate the map: scan of an area ~4 mm 2 at a resolution of 5 μm takes ~6 h whereas the same area at a resolution of 40 μm takes only 6 min. For scanning the weld map cost effectively through EBSD, the spatial scanning resolution must be established. The weld was sectioned into seven zones for scanning by EBSD this paper will make use of the weld structure in zone 1, the weld root. Figure 1 shows a macrograph of a dissimilar weld. The crystallographic orientation of the entire weld cross-section at several lengthwise positions was mapped using EBSD. Hence the researchers subsequently used macrographs to identify several distinct homogeneous regions where the dendrites had uniform grain orientation (6). Analysis showed that the columnar grains solidify along the crystal axis, with the austenite taking the face centered cubic (FCC) unit crystal. analysis to determine the crystalline structure of the weld metal (6). In fact, you're going to learn a lot more about how that 3D geometry in your CAD software works and then be able to apply it up front in the 3d modeling process so you can move along faster in the 3D rendering process. Not following how that applies to weld textures? Well, the context is important and he explains this, providing the terminology along with it, so by the end it all makes sense. This is how he explains it:įor a CAD user, local UV mapping is "a means to utilize how surfaces flow along a local UV coordinate in your parametric software." He starts off the video tutorial by describing the difference of UV mapping between polygon modeling software (like ZBrush, Maya, and 3ds Max) and parametric, solid (NURBS) modeling software (like NX, SOLIDWORKS, and PTC Creo). ksp files shown in the video for you to download and study yourself. The quick 15-minute video is not only a look into the process of creating realistic weld textures, but a tutorial chock full of info on preparing your CAD data for local UV mapping.Īnd, if a video tutorial isn't enough, he has provided the weld textures and the KeyShot. Recently, Magnus Skogsfjord shared his method for achieving realistic welds in KeyShot from CAD geometry.
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