2. Objectives
• Define the following terms:
– Depth of filling
– Spacing of plug
– Number of welds
• Define the contour and finish of a
plug weld
• Define the contour and finish of a
slot weld
3. Objectives (cont’d.)
• Distinguish a plug weld from a slot
weld on a drawing
• Interpret the dimension applied to
the plug and slot weld symbols
4. Plug and Slot Welds
• Shape of hole differentiates plug
and slot welds
– Plug weld: round hole
– Slot weld: elongated hole
• Plug weld symbol designates a fillet
weld in a round or slotted hole
• Identified by same symbol
– Plug weld symbol has diameter
symbol on left side
5. Plug and Slot Welds
(cont’d.)
• Slot weld identified by reference to
detail drawing in tail
– Detail drawing shows shape, location,
orientation of slot weld
• Symbol located below reference
line: hole is in arrow side
• Symbol above reference line: hole
in other side
6.
7.
8.
9.
10. Dimensions Applied to the
Plug and Slot Weld
Symbol
• Dimensions applied to plug welds:
– Size, depth of filling, included angle of
countersink, number of welds, pitch
• Size refers to diameter (inches) at
base of weld
– Located to left of weld symbol
– Preceded by diameter symbol
11.
12. Dimensions Applied to the
Plug and Slot Weld
Symbol (cont’d.)
• Width dimension of slot weld
located to left of symbol
– Represents width of minor axis of slot
at its base
• Sides straight or tapered
– Included angle on same side of
symbol
13.
14.
15. Dimensions Applied to the
Plug and Slot Weld
Symbol (cont’d.)
• Number of welds shown in
parenthesis below an arrow side
– May be specified in tail
• Included angle placed below angle
dimension
– Shown above the symbol when
symbol has an other side significance
16.
17. Dimensions Applied to the
Plug and Slot Weld
Symbol (cont’d.)
• Spacing (pitch) specified to right
of plug weld symbol
– Slot welds: pitch dimension follows
length dimension
– Preceded by hyphen
– May be shown in detail drawing
18.
19.
20. Dimensions Applied to the
Plug and Slot Weld
Symbol (cont’d.)
• Depth of filling shown within the
symbol for both welds
– When not shown complete filling
required
• Dimensions located on same side
of reference line as the symbols
21.
22.
23.
24. Contour and Finishing
• Plug and slot welds finished with
flush or convex contour
• Contour symbol shown above or
below the weld symbol
– Depends on arrow side or other side
significance
• Postweld finish specified above or
below the contour symbol
– Flat finish specified in note in the tail
25.
26. Plug Welds with Three or
More Joints
• Two or more members welded to
another by means of plug weld
• Joints to be welded shown by
section drawing
• Section drawing shows members
that require joint preparation
27.
28. Summary
• Shape of hole differentiates plug
and slot welds
• Dimensions applied to plug weld:
– Size
– Depth of filling
– Included angle of countersink
– Number of welds
– Spacing (pitch)
29. Summary (cont’d.)
• Plug and slot welds finished with
flush or convex contour
• Flat finish specified by a note in the
tail
– Note for flush finish not needed
• When two or more members
welded to another:
– Joints shown in section drawing
