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Weld Symbol Interpreter Calculator

Interpret welding symbols to determine effective throat, effective area, joint category, and weld volume.

Inputs

in
in
in

Results

Effective Throat

0.18 in

Effective Area

2.12 in²

Joint Category1 (1=Fillet, 2=CJP/PJP, 3=Special)
Weld Volume0.38 in³
How to Use This Calculator
  1. Enter Weld Type, Weld Size, and Weld Length.
  2. Set Pitch (Center-to-Center), Arrow Side, and Other Side.
  3. Adjust Field Weld as needed.
  4. Review Effective Throat (in) and Effective Area (in²).
  5. Use Joint Category ((1=Fillet, 2=CJP/PJP, 3=Special)) and Weld Volume (in³) to inform your decision.

How the result changes with Weld Size

Weld SizeEffective ThroatEffective Area
0.460.32 in3.86 in²
1.441.02 in12.22 in²
2.621.85 in22.22 in²
3.612.55 in30.62 in²

What each input means

Weld Type
1 = Fillet, 2 = Square Groove, 3 = V-Groove, 4 = Bevel Groove, 5 = U-Groove, 6 = J-Groove.
Weld Size
Leg size for fillet or depth for groove welds as shown on the symbol.
Weld Length
Length of the weld segment as shown on the symbol.
Pitch (Center-to-Center)
Center-to-center spacing for intermittent welds. Enter 0 for continuous welds.
Arrow Side
1 = Weld on arrow side, 0 = No weld on arrow side.
Other Side
1 = Weld on other side, 0 = No weld on other side.
Field Weld
1 = Field weld (flag symbol present), 0 = Shop weld.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Weld Type = 1, Weld Size = 0.25, Weld Length = 12, Pitch (Center-to-Center) = 0 = 7 input(s) provided
  2. Calculate Effective Throat
    Effective Throat
    0.177 = 0.177
  3. Calculate Effective Area
    Effective Area
    2.124 = 2.124
  4. Calculate Joint Category
    Joint Category
    1 = 1
  5. Calculate Weld Volume
    Weld Volume
    0.375 = 0.375

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