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For Indication of Welding Details on
Drawings.
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T joints
Butt joints
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Closed
corner
Open
corner
Lap joints
Corner joints
1. Root gap: separation between theedges to be welded at the root of the joint.
2. Root face: surface of the jointpreparation perpendicular to thesurface of the plate.
3. Bevel surface: oblique surface of the joint preparation
4. Bevel angle: angle between thebeveled surface and a planeperpendicular to the plate.
5. Included angle: total angle betweenthe two bevel surfaces.
6. Seam width: effective width of the joint(distance between the bevels plusdepth of penetration).
7. Thickness of the plate.
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1. Throat thickness: distance betweenseam root and surface measured onthe bisector of the angle
2. Leg length: distance between seamroot and edge
3. Joint root: point in which the bottomof the seam intersects the surface ofthe basemetal l
4. Joint edge: junction point betweenseam surface and base metalsurface
5. Joint surface: external surface of theseam
6. Fusion depth: depth reached by thefusion bath from the surface of thebase metal
7. Seam width: distance between the joint edges
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The purposes of a weld preparation is to allow
access for the welding process, penetration
and fusion through the area of the joint and its
faces. The more you take out, then the more you
must put back in.
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Single bevel
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Single J
Single U
Double bevel
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Double V
Double J
Double U
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It is a flat position with
plate.
Use this position, if at
a poss e.
“G” represents groove
and “F” refers fillet
welds.
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It is a horizontal weld
position.
A little more difficult
, ecause e mo en
metal tends to sag.
Use split bead
technique.
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It is a vertical position.
Welding is usually
done in uphill position.
Use weave bead
technique.
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It is a overhead weld
position. It is the most difficult
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Horizontal pipe axis.
Pipe rotation is allowed during welding tomake it flat position.
Either a split bead or weave techniquemay be used.
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Pipe axis vertical.
Pipe is considered in a “fixed”
position.
Always use a split bead
technique
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Axis of the pipe is horizontal.
No pipe rotation allowed.
A weave bead is best used.
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Pipe axis is fixed inposition at a 45 degreeinclination.
The osition includes flat, horizontal,vertical, and overheadwelds.
A split bead techniqueis best used.
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Weld symbol indicates the type of weld Welding symbol is a method of representing
the weld on drawings. It includes
su lementar
information
&
consists
of
the
8 elements.
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Welding Symbol is a method of representingthe weld on drawings. It includes:
Reference line
Arrow
Basic weld symbol
Dimension and other data
Supplementary symbols
Finish symbols
Tail
Specification, process or other reference
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SINGLE DOUBLE
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SINGLE DOUBLE
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SINGLE DOUBLE
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GROOVE
SINGLE DOUBLE
-
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SINGLE DOUBLE
-
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SINGLE DOUBLE
-
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SINGLE DOUBLE
FLARE-
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GROOVE
SINGLE DOUBLE
-
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-
GROOVE
The arrow line
Shall touch the joint
intersection
a not e para e to t e
drawing
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The reference line
Shall touch the arrow line
Shall be parallel to the bottom of the drawing
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Welds on the arrow side of the joint are
shown
by
placing
the
weld
symbol
below the
reference line
Welds on the other side of the joint are shown by placing the weld symbol above the
reference line Welds on both sides of the joint are shown by
placing the weld symbol on both sides of the
reference line
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OTHER SIDE
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ARROW SIDE
1/4 2-10 10 in
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1/4 2-10
2-101/4
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10 in
10 in
-
A circle at the tangent of the arrow and the reference line means welding to be all around
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A flag at the tangent of the reference line and
arrow means Field Weld.
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Welds this side of joint, go underneath the reference line Welds the other side of the joint, go on top of the
reference line Symbols with a vertical line component must be drawnwith the vertical line to the left side of the symbol
All standard dimension of weld are shown to the left oft e sym o
All linear dimensions are shown on the right of the symboli.e. Number of welds, length of welds, length of any
(spaces)
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10 4 x 50 (50)
Fillet weld Double bevel Double J
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Double V Double U
8
8
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5
a 5 b 8
8
Tail of the symbol designates the welding
specification, procedures, or other
information used to make the weld
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THANKS
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