Which weld test is rotated while in the horizontal position?

The 1G weld test is conducted with the pipe placed in a horizontal position and is rotated during the welding process. This testing format allows for the assessment of the welder's ability to produce sound welds while managing the position and alignment of the pipe as it turns. The rotation mimics the scenarios that a welder would encounter when working on large pipes or tanks that are connected or joined in a similar manner during installation.

The focus of the 1G position is on flat and horizontal welding, which maxes out the level of comfort and effectiveness for welders since both the pipe and the joining elements maintain a consistent distance and alignment. This allows welders to demonstrate their skills in producing quality welds under conditions that are realistic and common in high-pressure piping applications.

On the other hand, weld tests like the 2G, 4G, and 6G involve different positions – vertical, overhead, and inclined respectively. Each of these has its unique challenges and requires different techniques and skills from the welder. The 1G test’s focus on a horizontal and rotating pipe distinguishes it from the other options specified, making it the correct choice for this question.