: The weld is made on the underside of a horizontal surface where two pieces of metal meet at a right angle (T-joint or lap joint).
This article provides a full, deep dive into the 4F welding position—covering its definition, techniques for different processes (SMAW, GMAW, FCAW), common defects, troubleshooting, and certification tips. 4f welding position full
In all cases, the , but the weld face is below the welder (overhead). : The weld is made on the underside
The is a specialized designation for an overhead fillet weld . In this configuration, the welder works from underneath the joint, depositing weld metal onto the underside of a horizontal surface and against a vertical surface. Because gravity pulls the molten metal away from the joint, 4F is widely considered one of the most difficult and technical positions to master. Core Definition and Standards The is a specialized designation for an overhead fillet weld
: The weld is made on the underside of a horizontal surface where two pieces of metal meet at a right angle (T-joint or lap joint).
This article provides a full, deep dive into the 4F welding position—covering its definition, techniques for different processes (SMAW, GMAW, FCAW), common defects, troubleshooting, and certification tips.
In all cases, the , but the weld face is below the welder (overhead).
The is a specialized designation for an overhead fillet weld . In this configuration, the welder works from underneath the joint, depositing weld metal onto the underside of a horizontal surface and against a vertical surface. Because gravity pulls the molten metal away from the joint, 4F is widely considered one of the most difficult and technical positions to master. Core Definition and Standards