Comer fillets

For comer, fillet, or lap-welded joints, the thickness used shall be the thinner of the two parts being joined. 

What is the minimum required wall thickness (rounded up to the next 1/8 in.) of a 12 3/4-in. ID nozzle attached to a 60-in. ID by 3.75-in. thick drum The allowable stress of both the shell and nozzle material is 15.0 ksi. The nozzle is attached by a full penetration weld with comer fillet welds with a throat of 0.7 7 . The design pressure if 1400 psi at room temperature. 

A 10 in. inside diameter nozzle is attached by a full-penetration weld and comer fillet weld to a 48-in. inside diameter as shown in Figure 11.156. The shell material is SA-266 Class 1 carbon steel and the nozzle material is SA-182 F304 stainless steel. The design pressure is 1250 psi at a design temperature of 500°F. What is the required thickness of the shell, nozzle, and pad (if required) to satisfy the reinforcement requirements ... 

Another aspect to be considered is the difficulty in producing curved structures with the same fibre content as flat laboratory panels. This effect is shown in Figure 16, at the comer the laminate thickness is larger than at the flat section and fibre content is rather lower. This will affect the bending stiffness of the arm and the predicted failure load. This figure also shows the fillet, which is critical to initiation in the specimens without implanted defects. It is well known that fillets can significantly alter the load path in lap shear joints and increase the failure loads (see [1] and Figure 3 for example). If a fracture mechanics approach is to be applied this effect must be considered. Some recent studies on stress intensity factors for such cases may allow this to be addressed [22]. 

Stamped identifications on structural components must be located so as to avoid introduction of surface mechanical stresses that lead to cracking during service. Locations such as fillets on shafts are unacceptable. As a further precaution, low-stress stamping should be used. Low-stress stamping dies have broken (rounded) comers on the impression symbols to minimize the intensity of the localized stress caused by the stamping impression. 

Outside edges at the pcuting tine should be designed without a radius. Fillets should be specified at the base ribs and bosses and on comers and should be not less than 0.8 mm. 

A small proportion of particles is allowed to collect in comers or on the bottom in relatively stagnant regions to form fillets. This condition may offer advantages from the practical point of view because of the very large saving in power consumption compared with that required for complete suspension. This power saving may more than offset the loss of active solids. For example, at... 

Rewatkar et al. (1989) have reviewed the literature on solid suspension in two-phase systems. Subsequently, a large body of information has been generated, which rationalizes the earlier data as discussed earlier. It should be noted here that most investigators (e.g., Rewatkar et al. 1989 Nikhade and Pangarkar 2005) used vessels with flat bottoms. In such vessels, fillets of solids tend to form at the vessel wall base comers. For larger vessels with dish end bottoms, these fillets are found predominantly below the impeller or halfway between the vessel axis and periphery. 

Corner Joint A comer joint is a connection between two members at right angles to each other that is made with a fuU penetration weld, partial penetration weld or fillet welds. 

Basically, BM products should be designed with generous radii at their comers and edges. Fillets and rounds should be employed wherever possible in comers, ribs, and edges (see Fig. 7-65). Such parts will possess more uniform wall thickness and, as a result of more uniform and faster cooling, internal stresses will be reduced. With all this action, various techniques can also be used for strengthening parts ... 

When the side wall of bottom-comer welds forms a right angle with the bottom, the fillet weld is seldom as smooth as shown in Fig. 11.24((j). It is usually rough and frequently varies in width... 

Fillet -bt n [ME filet, fr. MF, dim. of /thread] (14c) A concavely curved transition at the angle formed by the junction of two plane surfaces, i.e., a rounded inside comer. Also, the material making np the transition. Where the surfaces are likely to endure bending toward or away from each other, the fillet distributes and reduces the stress that would otherwise be magnified at the comer. 

Rg. 4 Comer and fillet radii for various materials recommended by forging users and producers. Source T.AItan etal., Forging Equipment, Materials, and Pracdoes, MClC HB-03, Battelle, 1973... 

Draft, comer, and fillet radii, and minimum section thicknesses and maximum rib heights... 

Comer and Fillet RadiL Proper selection of comer and fillet radii is critical in avoiding metal flow problems such as laps, cold shuts, and flow-through defects in structural rib-web foigings and other parts with deep cavities. 

As with draft angles, exact values of comer and fillet radii cannot be quoted, is... 

The first precision forged titanium alloy products commerdally produced were turbine engine compressor and fan blades conventional forging process techniques were used. With hot-die/isother-mal forging techniques, very complex cross-section predsion forged airfi ame components are being manufactured. Titanium alloy predsion forgings are produced with very thin webs and ribs sharp comer and fillet radii imdercuts, back-draft, and/or contours and, fiequently. 

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