Final answer:
The angle in question is known as the work angle or travel angle in welding, and it influences filler deposition and weld bead quality.
Step-by-step explanation:
The correct answer is option travel angle or work angle in welding terminology. When discussing the angle that is less than 90 degrees between a line perpendicular to the surface of the work-piece and a plane determined by the electrode axis and the weld axis, this is typically referred to as the work angle or travel angle in the context of welding.
Specifically, this angle influences the direction of the filler material deposition and can affect the shape and quality of the weld bead. In a situation where no electric flux passes through the surface, as mentioned in the provided notes, the angle between the electric field and the normal to the surface needs to be 90 degrees.
Therefore, the angle in question would be the complement to 90 degrees, which is the work angle in the welding process.