Set OS 54 = 1 to suppress all welds.
Set OS 54 = 2 to only plot site welds.
Set OS 54 = 3 to only plot fabrication welds.
Set OS 54 = 0 to make all welds appear as erection welds.
Set OS 54 = 4 to make all welds appear as fabrication welds.
This option switch also changes the type of weld numbers generated.