Need help urgently!

Hi guys,

What is the meaning of 1D , 2D , 3D , any welding position.

Does 1D, 2D , 3D refer to the geometry of the welding material ? is there any define standard for 1D , 2D , 3D ( for welding )

i am unable to get a clear define using internet search... is there any keyword that i can try to refine my search. actually i am not sure what
does 1D 2D 3D really means therefore seeking help here!

From,

Begineer