Welding Symbols AA

8/16/2019 Welding Symbols AA

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For Indication of Welding Details on

Drawings.

Presentation By: ADNAN ASHRAF.Senior Project Engineer 2

T joints

Butt joints

Presentation By: ADNAN A SHRAF.Senior Project Engineer 3

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.


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


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

Presentation By: ADNAN A SHRAF.Senior Project Engineer 7

Single J

Single U

Double bevel


Double V

Double J

Double U


It is a flat position with

plate.

Use this position, if at

a poss e.

“G” represents groove

and “F” refers fillet

welds.


It is a horizontal weld

position.

A little more difficult

, ecause e mo en

metal tends to sag.

Use split bead

technique.


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


Horizontal pipe axis.

Pipe rotation is allowed during welding tomake it flat position.

Either a split bead or weave techniquemay be used.


Pipe axis vertical.

Pipe is considered in a “fixed”

position.

Always use a split bead

technique


Axis of the pipe is horizontal.

No pipe rotation allowed.

A weave bead is best used.


Pipe axis is fixed inposition at a 45 degreeinclination.

The osition includes flat, horizontal,vertical, and overheadwelds.

A split bead techniqueis best used.


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

Presentation By: ADNAN ASHRAF.Senior Project Engineer 19 Presentation By: ADNAN ASHRAF. Senior Project Engineer 20

SINGLE DOUBLE


SINGLE DOUBLE


SINGLE DOUBLE


GROOVE

SINGLE DOUBLE

-



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SINGLE DOUBLE

-


SINGLE DOUBLE

-


SINGLE DOUBLE

FLARE-


GROOVE

SINGLE DOUBLE

-


-

GROOVE

The arrow line

Shall touch the joint

intersection

a not e para e to t e

drawing


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


OTHER SIDE


ARROW SIDE

1/4 2-10 10 in


1/4 2-10

2-101/4


10 in

10 in

-

A circle at the tangent of the arrow and the reference line means welding to be all around


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)


10 4 x 50 (50)

Fillet weld Double bevel Double J


Double V Double U

8

8


5

a 5 b 8

8

Tail of the symbol designates the welding

specification, procedures, or other

information used to make the weld


Presentation By: ADNAN ASHRAF.Senior Project Engineer 41 Presentation By: ADNAN ASHRAF. Senior Project Engineer 42


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THANKS


Documents

Welding Symbols AA