There are various types of welding opinion in different workshop for exact method of welding position. Weld positions are varying for different countries welders. So this type of confusion can be avoided by follow the given guideline of British Standards Institution, which have been collaboration with some leading British welding firms.
Generally there are main five types of welding position followed.
The another weld position is weld slope, which is defined as the angle formed between the line of the weld root and a horizontal reference plane bellow the lowest portion of the weld (follow bellow picture).