In AWS D1.1, if a welder is qualified to make groove welds in the overhead position, which other positions can they also weld in?

When a welder is qualified to make groove welds in the overhead position according to AWS D1.1, they automatically gain the ability to weld in other positions such as flat and vertical. This is because the overhead position is generally considered to be one of the most challenging due to the angle of work and the need for precise control of the molten weld pool. As such, if a welder demonstrates proficiency in the overhead position, this competency indicates they are capable of handling less complex positions like flat or vertical.

Flat position welding usually involves less gravity influence on the weld pool and is typically easier to perform successfully. Likewise, vertical position welding often shares techniques and skill sets with overhead welding, allowing those capable of performing in one to handle the other effectively. Hence, qualification in the overhead position encompasses the skills necessary for both flat and vertical positions, reinforcing the idea that welder qualification in AWS D1.1 follows a logical progression based on the complexities of different welding positions.