WELDING POSITIONS

                           

WELDING POSITIONS- PLATE

·         It is found that there is lots of confusion regarding knowledge of welding position symbols for ISO and EN.

·         Also the positional notation is different for the Groove welding and Fillet welding.

·         Welding position is nothing but the position in which welder doing the specified welding.

·         As we know for all time welder not doing welding in the same position.

·         As per design of various jobs, structures, products having various shapes hence welding position is also varies as per the job position.

·         There are various welding position is defined by ISO and EN standards.

·         Basic welding position symbols are as below

·         1 indicates flat position

·         2 indicates horizontal position

·         3 indicates vertical position

·         4 indicates overhead position

WELDING POSITIONS AS PER ASME

WELD POSITION: FLAT POSITION

·         Symbol: 1G or 1F

·         G stands for groove welding and F stands for Fillet welding.

·         This type of welding is performed by placing base metals on the ground in such a way that weld preparation is on upper side.

·         It is also called down hand welding position.

·         It is the easiest type of the welding.

·         In this welding type the welded material is goes and insert the groove by means of gravity.

  

WELD POSITION: HORIZONTAL POSITION

·         Symbol: 2G or 2F

·         2G is the horizontal groove welding in which the base metal is kept in such a way that the plates are perpendicular to the ground surface and welding joint axis is parallel to the ground.

·         2F is the horizontal fillet welding in which the base metal is kept parallel to the ground and fillet metal is perpendicular to the base metal and welding axis is parallel to the ground surface.

·         It is quite hard to welding in this position require good skill worker to do this type of welding.

·         Chances of occurring defects like incomplete fusion or undercut.

  

WELD POSITION: VERTICAL POSITION

·         Symbol: 3G or 3F

·         In this position weld metals and welding axis are both perpendicular to the ground surface.

·         In this welding there are two different method of welding that is by Uphill or downward and downhill or upward.

·         Due to the gravity force the molten metal in the welding is flows downward and hence there is possibility to occur pile up.

·         Pile up is nothing but the metal droplets comes over the welding without melting properly with base metal.

·         To control this type of defect the welding torch or welding gun is kept at 45° angle with the plate.

  

WELD POSITION: OVERHEAD POSITION

·         Symbols: 4G or 4F

·         In this position base metals are overhead of the welder and axis of welding is parallel to the ground surface.

·         It is very difficult to weld in this position and hence highly skilled welder is required to welding.

·         During welding in this position there is a possibility to drops down of molten metal before cooling.

·         Hence to avoid this type of defects welder welds small portion and give time to cooling the weld bid.

  

ISO AND EN SYMBOLS

Sr no	Weld position	ISO & EN symbol
		Groove weld	Fillet weld
1	Flat position	PA	PA
2	Horizontal position	PC	PB
3	Vertical upward	PF	PF
4	Vertical downward	PG	PG
5	Overhead	PE	PD