welding symbol: difference between ISO vs AWS welding symbol

Difference between ISO Vs AWS Welding Symbol

In ISO welding symbol, a identification line is additionally added when compared to AWS welding symbol

In ISO welding symbol, irrespective of weld symbol position either on top or bottom, the weld symbol placement on line is much concerned,

When the symbol is placed on the reference (continuous) line, it means the weld is on the same side, refer Fig 2.

And when the symbol is placed on the identification line (dashed line), it means the weld is on the other side, refer Fig 1.

The symbol is to be placed either above or beneath the reference line, in accordance with the following regulation:

OTHER SIDE FILLET WELD

FIG 1: The symbol is placed on the identification line (dashed line) side if the weld (weld face) is on the other side of the joint

irrespective of weld symbol placed either on top or bottom, when the weld symbol is placed on identification line (dashed line) it means that, the weld is on other side.

SAME SIDE FILLET WELD

FIG 2: The symbol is placed on the continuous line side of the reference line if the weld (weld face) is on the arrow side of the joint

irrespective of weld symbol placed either on top or bottom, when the weld symbol is placed on reference line (line continuous) line it means that, the weld is on same side.

SYMMETRICAL FILLET WELD
 

FIG 4: The identification line (dashed line) is not required for symmetrical welds

DIFFERENT BETWEEN z & a
 

FIG 3: when prefix "z" is used before weld size, it means weld leg long, when prefix "a" is used before weld size then it means throat thickness

Comparison between ISO Vs AWS Welding Symbol

the table comparison of ISO welding symbols Vs AWS welding symbol is show in FIG 5

WELDING SYMBOL STANDARD LOCATION OF ELEMENTS ARE GIVEN BELOW