Dimensioning of welds

The dimensions of a weld may be added to a drawing in the following manner.

Dimensions relating to the cross section of the weld are symbolized by b and are given on the left-hand side of the symbol. The cross-sectional dimension to be indicated for a fillet weld is the leg length. If the design throat thickness is to be indicated then the leg-length dimension is prefixed with the letter b and the design throat thickness with the letter a.

Longitudinal dimensions are symbolized by l and are given on the right-hand side of the symbol. If the weld is not continuous then distances between adjacent weld elements are indicated in parentheses. Unless dimensional indication is added to the contrary, a fillet weld is assumed to be continuous along the entire length of the weld. Leg-length dimensions of fillet welds of 3, 4, 5, 6, 8, 10, 12, 16, 18, 20, 22 and 25 millimetres are the preferred sizes.

Applications of dimensions to different types of fillet welds are given in Table 26.5 in order to indicate the scope of the British Standard, which should be consulted to fully appreciate this topic. Table 26.5(a) shows dimensions applied to continuous fillet welds, (b) shows dimensions applied to intermittent fillet welds, and (c) shows dimensions applied to staggered intermittent fillet welds.

Table 26.5 The dimensioning of welds

Definition

Inscription

%

b

\\

W////

b is the leg length a is the design throat thickness (1) Continuous fillet welds

Throat Thickness Leg Length Fillet Weld

b a b b a b is the leg length a is the design throat thickness (1) Continuous fillet welds l ^e^ l ^e^ l

Innnn ddii)

Innnn ddii)

I)))))»

))))))»

)

i

e

i

l is the length of weld (without end craters) e is the distance between adjacent weld elements n is the number of weld elements b and a as defined above (2) Staggered intermittent fillet weld b a b a x l n x l

l is the length of weld (without end craters) e is the distance between adjacent weld elements n is the number of weld elements b and a as defined above (2) Staggered intermittent fillet weld l l

a, b, l, e and n as defined above (3) Intermittent fillet welds b b b e

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Responses

  • Craig
    How to check the thickness of fillet weld?
    8 years ago
  • Phillipp
    How to dimension weldments in drawing?
    7 years ago
  • lobelia
    How to dimension welding drawing?
    2 years ago
  • alison
    How to dimension weld?
    1 year ago
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    What are the dimensions of the weld?
    1 year ago
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    How to dimension weld length on a drawing?
    1 year ago
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    How to dimension welds on a drawing?
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    11 months ago
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    9 months ago
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    How to dimension butt welds symbol?
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    Do the welds get dimensioned in assembly?
    8 months ago
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    Why are some weld dimension in prentities?
    8 months ago
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    How a filet weld is dimensioned?
    7 months ago
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    When are weld dimensions reference dimensions?
    5 months ago
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