In addition to the basic joints, there is an assortment of other joints for special purposes, Figure 11.3. Corner flange and edge flange joints are used for light metals. The flare bevel and flare V-groove joints are used in weldments of heavier gage materials where one or two of the members have a curved shape. The scarf joint is used for brazed weldments.

JOINTS COMMONLY USED WITH STRUCTURAL SHAPES

Many methods can be used to assemble structural members to form a joint. There are also many different weld and groove designs that may be used with these structural members. The design of the weld and/or the groove is usually the function of the designer. Standard welding symbols are used to indicate the welds required. Weldments may be fabricated using only one type of structural shape or combinations of different structural shapes. Figure 11.4 illustrates a few methods of joining similar and dissimilar structural shapes.

THIS LEG MAY BE HEATED IF NECESSARY

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FIGURE 11.5 ■ Fabricating joints by cutting and bending.

Joints for structural shapes may also be formed by cutting and bending the members, Figure 11.5. In cer­tain cases, this procedure may be more economical, since less cutting and welding are required. Although the examples shown are for an angle bar, the same principles apply to other structural shapes.

When a grooved joint is required on heavy structural shapes, it may be possible to provide for a groove without formal preparation of the joint members. The angle and T-bar joints shown in Figure 11.6 illustrate this point.