AG Mechanics CDE Practice Exam 2026 – The Comprehensive All-in-One Guide for Success

Flat weld is considered to be the most difficult due to its position and constant need for vertical movement. Flat welding often requires working on a horizontal plane that can make it challenging to achieve proper penetration, maintain an even bead, and avoid burn-through. In contrast, the other options (horizontal, vertical down, and vertical up weld) typically involve more stable positions and more manageable movement patterns, making them less difficult.