4g Weld Test !!exclusive!! May 2026

1. Overview & Definition The 4G weld test (4G = 4th Position, Groove weld) is a qualification test for welders performing overhead groove welding . In this position, the weld axis lies approximately horizontal, but the welder deposits the weld from the underside of the joint . The face of the weld is in a horizontal plane, and the welder must push the molten metal upward against gravity.

AWS D1.1 (Structural Steel), ASME Section IX (Pressure Vessels), API 1104 (Pipelines).