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FIGURE 26.30 (a) If the gap is too small, the weld will bridge the gap, leaving slag at the root; (b) a proper joint preparation; (c) a root opening that is too large will result in burnthrough. (The Lincoln Electric Company.)
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26.34a. Additional buildup, as shown in Fig. 26.34b, serves no useful purpose and will increase the weld cost. Care should be taken to keep both the width and the height of the reinforcement to a minimum. 26.8.6 Edge Preparation The main purpose of a root face (Fig. 26.35a) is to provide an additional thickness of metal, as opposed to a feather edge, in order to minimize any burnthrough tendency. A feather-edge preparation is more prone to burnthrough than a joint with a root face, especially if the gap gets a little too large (Fig. 26.35b). A root face is not as easily obtained as a feather edge. A feather edge is generally a matter of one cut with a torch, whereas a root face will usually require two cuts or possibly a torch cut plus machining. A root face usually requires back-gouging if a 100 percent weld is required. A root face is not recommended when welding into a backup strip, since a gas pocket would be formed. Plate edges are beveled to permit accessibility to all parts of the joint and to ensure good fusion throughout the entire weld cross section. Accessibility can be gained by compromising between maximum bevel and minimum root opening (Fig. 26.36).
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FIGURE 26.31 The backup strips shown in (a), (b), and (c) are used when all welding is done from one side or when the root opening is excessive; a spacer to prevent burnthrough as shown in (d) will be gouged out before welding the second side. (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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FIGURE 26.32 Short, intermittent tack welds should be used to hold the backup strip in place. (The Lincoln Electric Company.)
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Degree of bevel may be dictated by the importance of maintaining proper electrode angle in confined quarters (Fig. 26.37). For the joint illustrated, the minimum recommended bevel is 45 degrees. J and U preparations are excellent to work with, but economically they may have little to offer because preparation requires machining as opposed to simple torch cutting. Also, a J or U groove requires a root face (Fig. 26.38) and thus back-gouging. To consistently obtain complete fusion when welding a plate, back-gouging is required on virtually all joints except bevel joints with a feather edge. This may be done by any convenient means: grinding, chipping, or gouging. The latter method is generally the most economical and leaves an ideal contour for subsequent beads.
FIGURE 26.33 The backup strip should be in intimate contact with both edges of the plate. (The Lincoln Electric Company.)
FIGURE 26.34 (a) A minimum reinforcement on a butt joint is preferred; (b) too much reinforcement. (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.
WELDED CONNECTIONS 26.38
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FIGURE 26.35 (a) A root face minimizes the tendency to burnthrough; (b) a feather edge is more prone to burnthrough than a joint with a root face. (The Lincoln Electric Company.)
FIGURE 26.36 Accessibility is gained by compromising between bevel and root opening. (The Lincoln Electric Company.)
FIGURE 26.37 Degree of bevel may be dictated by the need for maintaining proper electrode angle. (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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