Which welding position is identified as "flat" position?

The "flat" position in welding is characterized by the welder working on the top of a joint that is essentially horizontal. In this position, the face of the weld is flat, allowing for ease of access and control during the welding process. When welding in this position, gravity aids in the flow and pooling of the molten metal, contributing to a more uniform and stronger weld bead.

In this context, the description of the joint being horizontal and the welding being performed from the upper side aligns perfectly with the definition of flat position welding, as it ensures that the welder has optimal visibility and access to the weld area.