foundation system of burj al arab

Groove Welds

Groove Welds: This post provides the requirements for the design of connectors (Groove welds) and connecting elements such as plates, stiffeners, gussets, angles, brackets, etc. The requirements for groove welds are stated here following AWS : D 1.1 : Structural Welding Code-Steel.

Effective area
Effective area of groove welds shall be considered as the effective length of the welds times the effective throat thickness.

The effective length of groove weld shall be the width of the part joined.

The effective throat thickness of a complete penetration groove weld shall be thickness of the thinner part joined.

The effective throat thickness of a partial-penetration groove weld shall be as shown in Table-1.

Table-1: Effective throat thickness of a partial-penetration groove welds.

Welding Process
Welding Position
Include Angle of Root of Groove
Effective throat Thickness
Shielded Metal Arc

Submerged Arc

Gas Metal Arc


Flux-Cored Arc



All
J or U Unit



Depth of Chamfer

Bevel or V
joint ≥600

 
Bevel or V
joint <600 ≥450
Depth of Chamfer minus 3 mm.
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The effective throat thickness of a flare groove welds when flush to the surface of bar or 900 bend in a formed section shall be as shown in Table-2. Random sections of a production weld for each welding procedure, or such test sections as may be required by design documents, shall be used to verify that the effective throat is consistently obtained.

Table-2: Effective throat thickness of a Flare groove welds.
Type of Weld
Radius (R) of Bar or Bend
Effective throat Thickness
Flare Bevel Groove
All
5/16 R
Flare V- Groove
All
½ R*
Use 3/8 for Gas Metal Arc Welding (except short circuiting transfer process when R≥12mm.

Limitations
The minimum effective throat thickness of a partial penetration groove weld shall be as shown in Table-3. Minimum effective throat thickness is determined by the thicker of the two parts joined, except that the weld size need not exceed the thickness of the thinnest part joined though a large size is required by calculation. For this exception, particular care shall be taken to provide sufficient pre-heat foe soundness of the weld.

Table-3: Minimum effective throat thickness of a partial-penetration groove welds.
Material Thickness of Thicker part joined, mm
Minimum Effective Throat Thickness,mm
To 6 Inclusive
3
Over 6 to 12
5
Over 12 to 20
6
Over 20 to 40
8
Over 40 to 60
10
Over 60 to 150
12
Over 150
16

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