FIGURE 17.1 ■ Typical joints to which the edge weld symbol is applied.

The edge weld symbol __ has replaced the flange butt JL and corner flange L weld symbols, which have become obsolete. These former weld symbols are identified as joints to which the edge weld symbol is applied, Figure 17.1(a) and (b). Note that an edge weld symbol may also be applied to an edge joint, Figure 17.1(c).

FIGURE 17.2 ■ Application of edge weld symbol to indicate arrow side, other side, and both sides welds.

The edge weld symbol is used particularly for sheet metal joinery (welding metal 3/іб" or less in thickness). It may be shown having an arrow side, other side, or both sides sig­nificance, Figure 17.2(a) and (b). It has a both sides application only to an edge joint. When so used, the symbols are placed opposite each other on the reference line, Figure 17.2(c).

Dimensions that may be added to the edge weld symbol are size, length, and spacing (pitch of intermittent welds). The standard locations for these dimensions are shown in Figure 17.3.

FIGURE 17.3 ■ Dimensions applied to the edge weld symbol.

In instances where the weld is to be the full length of the joint, no length dimension is required. However, when the weld is to be specified for a particular length, dimensions within the extension lines are used, Figure 17.4. Hatching lines may also be applied to a detail drawing to indicate lengths to be welded.

When specifying the length and spacing of intermittent edge welds, the dimensions are placed to the right side of the weld symbol. The first dimension represents the length of the weld and the second, separated by a hyphen, the pitch, Figure 17.5.

To specify a chain intermittent edge weld, the edge weld symbol is applied to the weld­ing symbol as shown in Figure 17.6. Note that the edge welds are directly opposite each other, and the length and pitch dimensions are located to the right of the symbols on both sides of the reference line. Length is the first dimension followed by a hyphen (-) and then the pitch.

FIGURE 17.4 ■ Identifying sections to be welded by the use of hatching lines and dimensions within extension lines.

FIGURE 17.6 ■ Chain intermittent edge welds.

FIGURE 17.5 ■ Application of length and pitch dimensions to an edge weld symbol.

FIGURE 17.7 ■ Location of symbols for staggered intermittent edge welds.

17.8 ■ Application of a staggered intermittent edge weld symbol.

For staggered intermittent edge welds, the edge weld symbol is shown offset, Figure 17.7 and Figure 17.8. Applicable length and pitch dimen­sions are placed on the right side of each symbol.

The edge weld symbol has the same applica­tion to multiple members of a flanged butt joint, flanged corner joint and edge joint consisting of more than two members, 17.9(a) and (b).

Other symbols that may be used in combina­tion with the edge weld symbol are the melt - thru symbol ^b, the flare V-groove symbol ~r, and the flare bevel groove symbol ІЛ The melt- thru symbol is added when complete joint penetration is to be specified, Figure 17.10. Note that in this process the joint loses its identity.

The flare V-groove and flare-bevel groove symbols are used in combination with the edge weld symbol to reinforce the welded joint, Figure 17.11 and Figure 17.12.

ТГГ

b.

в»

WELD

WELD

WELD

THREE MEMBER FOUR MEMBER

FLANGE BUTT JOINT FLANGED CORNER JOINT EDGE JOINT

FIGURE 17.9 ■ Application of edge weld symbol to joints consisting of more than two members.

THREE MEMBER

FIGURE 17.10 ■ Combination edge weld and melt-thru symbol.

. bevel groove symbol.

To summarize, the edge weld symbol has many of the elements applied to other weld symbols—size, length, pitch, weld-all-around, weld-in-field, finishing and methods of finishing welds. It is applied to flange-butt, flanged corner, and edge joints, and may be used in conjunction with melt-thru, flare-groove, and flare-bevel symbols.

UNIT 17: REVIEW

Graph paper is provided at the end of this review for your use.

1. a. Identify three joints to which an edge weld 4. a. List three dimensions that may be applied to

symbol may be applied. an edge weld symb°l.

b. Sketch examples of these joints.

b. Sketch a welding symbol with an edge weld that includes the standard locations for these dimensions.

c. Apply the edge weld symbol with an arrow side significance to each of these joints.

Sketch how the edge weld symbol would be shown for an intermittent other side edge weld. Use a welding symbol for this purpose.

c. Identify each dimension on the sketch.

Sketch welding symbols that include an edge weld symbol having the following elements:

Convex contour Concave contour Flush or flat contour Weld-all-around Machine flat Planish flat

3. a. What other weld symbols may be used in conjunction with the edge weld symbol?

b. Sketch combination edge weld symbols to include the other weld symbols identified in 3(a).

6. Sketch a welding symbol that includes an edge weld symbol applied to extension and hatching lines to show the location and extent of an edge view.

7. Complete the following symbols to show: 9. Up to what metal thickness size is an edge weld

symbol usually applied?

a. A chain intermittent edge weld.

b. A staggered intermittent edge weld.

10. On the drawing that follows, sketch how the completed weld will appear as indicated by the weld symbols.

A weld-all-around edge weld including finish and method of finish.

11. Sketch a welding symbol to specify a both sides edge weld with a %" thickness on an edge joint.

8. a. Identify the joints that lose their identity upon completion of an edge weld when com­plete penetration is specified.

------------------------------------------------------------------ 12. In the following drawing, edge welds are to be

specified for the edges identified by hatched lines. Apply the appropriate symbol(s).

b. Using sketches, illustrate the joints and their appearance identified in 8(a) upon their completion.

c. Complete the following welding symbol to indicate an edge weld requiring complete penetration.