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FIGURE 26.27 Examples showing the effect of correct and incorrect throat dimension in determining the allowable load on a combination weld. (a) The weld allowable load would be incorrectly figured by adding each weld throat separately; (b) weld allowable load is correctly figured using the minimum throat. (The Lincoln Electric Company.)
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It is not very practical to first calculate the stresses resulting in a weldment when the unit is loaded within a predetermined dimensional tolerance and then use these stresses to determine the forces that must be transferred through the connecting welds. A very practical method, however, is to design the weld for the thinner plate, making it sufficient to carry one-third to one-half the carrying capacity of the plate. This means that if the plate were stressed to one-third to one-half its usual value, the weld would be sufficient. Most rigidity designs are stressed much below these values; however, any reduction in weld size below one-third the full-strength value would give a weld too small an appearance for general acceptance. 26.8.4 Groove Joints Figure 26.28a indicates that the root opening R is the separation between the members to be joined.A root opening is used for electrode accessibility to the base or root of the joint. The smaller the angle of the bevel, the larger the root opening must be to get good fusion at the root. If the root opening is too small, root fusion is more difficult to obtain, and smaller electrodes must be used, thus slowing down the welding process. If the root opening is too large, weld quality does not suffer, but more weld metal is required; this increases welding cost and will tend to increase distortion.
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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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TABLE 26.8 Rule-of-Thumb Fillet-Weld Sizes for Use in Cases Where the Strength of the Weld Metal Matches the Strength of the Plate
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Figure 26.28b indicates how the root opening must be increased as the included angle of the bevel is decreased. Backup strips are used on larger root openings. All three preparations are acceptable; all are conducive to good welding procedure and good weld quality. Selection, therefore, is usually based on cost. Root openings and joint preparation will directly affect weld cost (mass of weld metal required), and the choice should be made with this in mind. Joint preparation involves the work required on plate edges prior to welding and includes beveling and providing a root face. Using a double-groove joint in preference to a single-groove joint (Fig. 26.29) cuts in half the amount of welding. This reduces distortion and makes possible alternating the weld passes on each side of the joint, again reducing distortion. In Fig. 26.30a, if the bevel or gap is too small, the weld will bridge the gap, leaving slag at the root. Excessive back-gouging is then required. Figure 26.30b shows how
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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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FIGURE 26.28 (a) Root opening is designated as R; (b) size of root opening depends on bevel angle. (The Lincoln Electric Company.)
proper joint preparation and procedure will produce good root fusion and will minimize back-gouging. In Fig. 26.30c, a large root opening will result in burnthrough. Spacer strip may be used, in which case the joint must be back-gouged. Backup strips are commonly used when all welding must be done from one side or when the root opening is excessive. Backup strips, shown in Fig. 26.31a through c, are generally left in place and become an integral part of the joint. Spacer strips may be used, especially in the case of double-V joints, to prevent burnthrough.The spacer in Fig. 26.31d used to prevent burnthrough will be gouged out before welding the second side.
26.8.5 Backup Strips Backup strip material should conform to the base metal. Feather edges of the plate are recommended when using a backup strip. Short, intermittent tack welds should be used to hold the backup strip in place, and these should preferably be staggered to reduce any initial restraint on the joint. They should not be directly opposite one another (Fig. 26.32). The backup strip should be in intimate contact with both plate edges to avoid trapped slag at the root, as shown in Fig. 26.33. On a butt joint, a nominal weld reinforcement (approximately 1 16 in above flush) is all that is necessary, as shown in Fig.
FIGURE 26.29 Using a double-groove joint in place of a single-groove joint reduces the amount of welding. (The Lincoln Electric Company.)
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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