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EDGE JOINTS.
-Edge joints
are used to join two or more parallel or nearly parallel members. Edge joints are not very strong, and are used to join edges of sheet
metal, reinforcing plates in flanges of I-beams, and for edges of angles. Two parallel plates are joined together,
as shown in view A of figure 15-41. On heavy plates, sufficient filler metal is added to fuse or melt each plate
edge completely and to reinforce the joint. Light sheets are welded as shown in view B of figure 15-41. No preparation is necessary other than to clean
Figure 15-42.-Corner joints for sheets and plates. the edges and tack weld them in position. The edges are CORNER JOINTS . -Corner joints are used to join two members located approximately at right angles to each other in the form of an L. The fillet weld corner joint (view A of fig. 15-42) is used in the construction of boxes, box frames, and similar fabrications. The closed corner joint (view B of fig. 15-42) is used on lighter sheets when high strength is not required at the joint. In making the joint by oxyacetylene welding, the overlapping edge is melted down, and little or no filler metal is added. When the closed joint is used for heavy sections, the lapped plate is V-beveled or U-grooved to permit penetration to the root of the joint. The open corner joint (view C of fig. 15-42) is used on heavier sheets and plates. The two edges are melted down, and filler metal is added to fill up the corner. Corner joints on heavy plates are welded from both sides, as shown in view D of figure 15-42. The joint is first welded from the outside, and then reinforced from the back side with a seal bead. |
 
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