ISO 2553 Weld Symbol letters

[PeterSl]

Can anyone tell me if the letter "s" is required before the dimension for weld penetration on anything other than fillet welds? I can see from the standard that an "a" or a "z" is required when specifying fillet weld size but the examples for other welds are unclear as to the requirement for the "s".
Thanks
Pete

 

[denlow60]

S is symbool four A,Z,I,V

 

[TVP]

s indicates the throat thickness for a deep penetration fillet weld. See section 6.2.3 for definition.

 

[denlow60]

@ TVP
you are read in section 6.2.3 is explain

 

[PeterSl]

Thanks all for trying to help.
The standard is fairly clear on what the letters stand for, what is not so clear is whether or not the letter s has to precede the penetration dimension when one is used (no dimension implies full penetration.

 

[TVP]

The letter precedes the dimension, whether it is z, a, or s.

 

[rodofgod]

The letter 's' is also required for partial penetrant welds such as shown in 'Single-V butt weld with broad root face' and with the 'Single-bevel butt weld with broad root face',Items 5&6 in table 1).It states this in the footnote at the bottom of that table.If their is no 's' value buttweld are to have complete penetration.(6.2.2).