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26.8 DESIGN OF WELDED JOINTS
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While designers need some basic knowledge of welding processes, equipment, materials, and techniques, their main interest is in how to transfer forces through welded joints most effectively and efficiently. Proper joint design is the key to good weld design. The loads in a welded-steel design are transferred from one member to another through welds placed in weld joints. Both the type of joint and the type of weld are specified by the designer. Figure 26.14 shows the joint and weld types. Specifying a joint does not by itself describe the type of weld to be used. Thus 10 types of welds are shown for making a
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TABLE 26.6 AWS A5.18-69 Mechanical Property Requirements for Gas Metal-Arc Welding Weld Metal
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TABLE 26.7 AWS A5.18-69 Chemical-Composition Requirements for Gas Metal-Arc Welding Electrode
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FASTENING, JOINING, AND CONNECTING
FIGURE 26.14 (a) Joint design; (b) weld grooves. (The Lincoln Electric Company.)
butt joint. Although all but two welds are illustrated with butt joints here, some may be used with other types of joints. Thus a single-bevel weld may also be used in a T or corner joint (Fig. 26.15), and a single-V weld may be used in a corner, T, or butt joint.
26.8.1 Fillet-Welded Joints The fillet weld, requiring no groove preparation, is one of the most commonly used welds. Corner welds are also widely used in machine design. Various corner arrangements are illustrated in Fig. 26.16. The corner-to-corner joint, as in Fig. 26.16a, is difficult to assemble because neither plate can be supported by the other. A small electrode with low welding current must be used so that the first welding pass does not burn through.The joint requires a large amount of metal.The corner joint shown in Fig. 26.16b is easy to assemble, does not easily burn through, and requires just half
FIGURE 26.15 (a) Single-bevel weld used in T joint and (b) corner joint; (c) single-V weld in corner joint. (The Lincoln Electric Company.)
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WELDED CONNECTIONS 26.27
WELDED CONNECTIONS
FIGURE 26.16 Various corner joints. (The Lincoln Electric Company.)
the amount of the weld metal as the joint in Fig. 26.16a. However, by using half the weld size but placing two welds, one outside and the other inside, as in Fig. 26.16c, it is possible to obtain the same total throat as with the first weld, but only half the weld metal need be used. With thick plates, a partial-penetration groove joint, as in Fig. 26.16d, is often used. This requires beveling. For a deeper joint, a J preparation, as in Fig. 26.16e, may be used in preference to a bevel. The fillet weld in Fig. 26.16f is out of sight and makes a neat and economical corner. The size of the weld should always be designed with reference to the size of the thinner member. The joint cannot be made any stronger by using the thicker member for the weld size, and much more weld metal will be required, as illustrated in Fig. 26.17.
FIGURE 26.17 Size of weld should be determined with reference to thinner member. (The Lincoln Electric Company.)
In the United States, a fillet weld is measured by the leg size of the largest right triangle that may be inscribed within the cross-sectional area (Fig. 26.18).The throat, a better index to strength, is the shortest distance between the root of the joint and the face of the diagrammatical weld. As Fig. 26.18 shows, the leg size used may be shorter than the actual leg of the weld. With convex fillets, the actual throat may be longer than the throat of the inscribed triangle.
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