Guide to writing fillet welding symbols
Fillet welds are dimensioned according to the following:
These dimensions are written on the same side of the reference line as the weld symbol.
The standard weld symbol location of elements is illustrated below. For beginners, you can use the illustration as a guide on where to place these dimensional parameters.
As you may notice not all of these parameters can be used in a filet welding symbol. Listed below are the following that will not be used:
These parameters are used for groove welds where root preparation are required. Also, for the spot, seam, plug, slot and projection welds, those are a whole host of different welding types altogether.
Fillet welding dimension placement
Fillet size - located to the left of the weld symbol and not enclosed in parentheses as for groove welds. For unequal legs, dimensional data will not indicate which size applies to which leg, this must be shown in the drawing detail similar to the illustration below.
Fillet length - placed to the right of the welding symbol. Length dimensions do not appear if the weld is made for the full length of the joint. The extent of the weld length is represented in the drawing.
Chain intermittent fillet weld dimensions - are placed on both sides of the reference line that is the welds are made opposite of each other on both joints. It will be called intermittent welds if these welds are placed on one side only. The length and pitch of the weld are written as follows, they are separated by hyphen on the right side of the welding symbol
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Staggered intermittent fillet welds - dimensioned similarly with chain intermittent weld but spaced symmetrically as shown. The welds are not directly opposite of each other as with chain intermittent welds.
Chain intermittent weld and continuous weld (meaning the weld with no breaks) can also be combined on both sides of the joint as shown below.
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