ASME Section IX - Weld Positions

Flat position (1G)

The test plates are placed in an approximately horizontal plane and the weld metal deposited from the upper side

Horizontal position (2G) 

The test plates are placed in an approximately vertical plane with the welding groove approximately horizontal

Vertical position (3G)

The test plates are placed in an approximately vertical plane with the welding groove approximately vertical

Overhead position (4G)

The test plates are placed in an approximately horizontal plane and the weld metal deposited from the underside

Horizontal rolled (1G)

The pipe is placed with its axis in an approximately horizontal plane with the welding groove in an approximately vertical plane and the pipe is rolled during welding

Vertical (2G)

The pipe is placed with its axis in an approximately vertical position with the welding groove in an approximately horizontal plane

Horizontal fixed (5G)

The pipe is placed with its axis in an approximately horizontal plane with the welding groove in an approximately vertical plane and the pipe is not to be rolled or turned during welding

Inclined fixed (6G)

The pipe is inclined fixed (45Deg. plus or Minus 5 Deg.) and not rotating during welding

For fillet welds in plates, different positions are defined as below

Flat position (1F)

The test plates are so placed that each fillet weld is deposited with its axis approximately horizontal and its throat approximately vertical

Horizontal position (2F)

The test plates are so placed that each fillet weld is deposited on the upper side of the horizontal surface and against the vertical surface

Vertical position (3F)

Each fillet weld is made vertically

Overhead position (4F)

The test plates are so placed that each fillet weld is deposited on the underside of the horizontal surface and against the vertical surface