What is WPS PQR WPQ?

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Welding Procedure Specification (WPS) :

WPS is specification wrote to Provide direction

to the welder or Welding operator for Making

Sound quality of Weld as per Code

Requirements. 

The welding variables are 

Joints(QW-402), 

Base metal(QW-403),

Filler metal(QW-404), 

Positions(QW-405), 

Pre-heat(QW-406), 

PWHT(QW-407), 

Gas(QW-408),

E characteristics QW-409), 

Techniques(QW-410).

WPS Welding Variables categorised as Essential Welding Variable, Supplementary essential Variables and Non Essential variables.

Essential Welding Variables : If any changes in the variable will make difference in mechanical properties of the weld joints then the requalification of WPS required.

Supplementary essential variable : If any changes intin affect thoughness properties of the joint where the thoughness testing is necessary at this case supplementary variable becomes an essential variable and requalification of WPS is required for this. When toughness testing is not needed for procedure Qualification then supplementary essential variable is will not make any difference in WPS.

Non Essential Variables : These Variables are will not affect any Mechanical Properties of the joint, So the WPS requalification not required when any Changes made to this variables.

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