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FIGURE 26.24 Comparison of weld joints having equal throats. (The Lincoln Electric Company.)
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permissible. Referring to Fig. 26.24, it can be seen that on the basis of an unreinforced 1-in throat, a 45-degree partial-penetration single-bevel groove weld requires just one-half the weld area needed for a fillet weld. Such a weld may not be as economical as the same-strength fillet weld, however, because of the cost of edge preparation and the need to use a smaller electrode and lower current on the initial pass. If the single-bevel groove joint were reinforced with an equal-leg fillet weld, the cross-sectional area for the same throat size would still be one-half the area of the
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FIGURE 26.25 Comparison of weld joints with and without reinforcing fillet welds. (The Lincoln Electric Company.)
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Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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fillet, and less beveling would be required. The single-bevel 60-degree groove joint with an equal fillet-weld reinforcement for the same throat size would have an area 57.8 percent of that of the simple fillet weld. This joint has the benefit of smaller cross-sectional area yet the 60-degree included angle allows the use of higher welding current and larger electrodes. The only disadvantage is the extra cost of preparation. From this discussion it is apparent that the simple fillet-welded joint is the easiest to make, but it may require excessive weld metal for larger sizes.The single-bevel 45degree included-angle joint is a good choice for larger weld sizes. However, one would miss opportunities by selecting the two extreme conditions of these two joints. The joints between these two should be considered. Referring to Fig. 26.25, one may start with the single-bevel 45-degree joint without the reinforcing fillet weld, gradually add a reinforcement, and finally increase the lower leg of the fillet reinforcement until a full 45-degree fillet weld is reached. In this figure, p = depth of preparation and = leg of reinforcing fillet. When a partial-penetration groove weld is reinforced with a fillet weld, the minimum throat is used for design purposes, just as the minimum throat of a fillet or partial-penetration groove weld is used. However, as Fig. 26.26 shows, the allowable load for this combination weld is not the sum of the allowable limits for each portion of the combination weld. This would result in a total throat much larger than the actual throat. Figure 26.27a shows the effect of using the incorrect throat in determining the allowable unit force on a combination weld. The allowable for each weld was added separately. In Fig. 26.27b, weld size is correctly figured on the minimum throat.
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FIGURE 26.26 Determining minimum throat. (a) Incorrect result; (b) correct result. (The Lincoln Electric Company.)
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26.8.3 Sizing of Fillets Table 26.8 gives the sizing of fillet welds for rigidity at various strengths and plate thicknesses, where the strength of the weld metal matches the plate. In machine design work, where the primary design requirement is rigidity, members are often made with extra-heavy sections, so that movement under load will be within very close tolerances. Because of the heavy construction, stresses are very low. Often the allowable stress in tension for mild steel is given as 20 kpsi, yet the welded machine base or frame may have a working stress of only 2 to 4 kpsi. The question arises as to how to determine the weld sizes for these types of rigidity designs.
The term allowable is often used in the welding industry to indicate allowable load, allowable stress, or unit allowable load EDS.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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