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WELD JOINTS

The weld joint is where two or more metal parts are joined by welding. The five basic types of weld joints are the butt, corner, tee, lap, and edge, as shown in figure 3-6.

CAUTION

Figure 3-7.-Root of joint.

Figure 3-8.-The groove face, root face, and root edge of joints.

Figure 3-9.-Bevel angle, groove angle, groove radius, and root opening of joints for welding.

A butt joint is used to join two members aligned in the same plane (fig. 3-6, view A). This joint is frequently used in plate, sheet metal, and pipe work. A joint of this type may be either square or grooved. Some of the variations of this joint are discussed later in this chapter.

Corner and tee joints are used to join two members located at right angles to each other (fig. 3-6, views B and C). In cross section, the corner joint forms an L-shape, and the tee joint has the shape of the letter T. Various joint designs of both types have uses in many types of metal structures.

A lap joint, as the name implies, is made by lapping one piece of metal over another (fig. 3-6, view D). This is one of the strongest types of joints available; however, for maximum joint efficiency, you should overlap the metals a minimum of three times the thickness of the thinnest member you are joining. Lap joints are com­monly used with torch brazing and spot welding appli­cations.

An edge joint is used to join the edges of two or more members lying in the same plane. Inmost cases, one of the members is flanged, as shown in figure 3-6, view E. While this type of joint has some applications in platework, it is more fixquently used in sheet metal work An edge joint should only be used for joining metals 1/4 inch or less in thickness that are not subjected to heavy loads.

The above paragraphs discussed only the five basic types of joints; however, there are many possible vari­ations. Later in this chapter, we discuss some of these variations.

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