Difference Between WPS and PQR

Last Updated : Sep 6, 2022 / By Piyush Yadav / Fact Checked / 4 mins

WPS  is popularly known as the welder’s guide that comprises all the product features, standard, quality, and also code requirements.

PQR doesn’t usually talk about any ranges. It is just a result of the test conducted by the high officials who check the quality. It consists of the results obtained from the quality tests performed on the welded materials.

Comparison Table Between WPS and PQR

Parameters of Comparison	WPS	PQR
Contents	WPS contains information from the PQR and is written with PQR as guidance.	PQR is not documented with the WPS as the reference.
Generic or Not	WPS is not generic and contains a wide variety of relevant information.	PQR is generic and does not contain random information apart from whatever is needed.
Definition	WPS is a document of rules, restrictions, guidance, and procedure to be followed during the process of welding.	PQR contains the observations prepared from the test conducted on the manufactured products.
Usage	WPS is used before the product is to be welded.	PQR is used after the product has been welded and the tests have been completed.
Place of Use	WPS is used by welders in industries, factories, and workshops.	PQR is usually done by licensed officers and it is an out-of-industry document.

What is WPS?

The procedure and the process specified in the document are tested and proved to aid the welders in a successful way. It makes sure the safety, quality, and other factors are in check.

That is the main reason why the product should be manufactured and produced with the utmost care, and in compliance with all the rules.

This is a great tool that might come in handy for new welders, it helps them to hone and develop their skills to the same level as the welders who have been welding for years.

This helps in achieving perfection and also the customers can rely on the welders if they follow the WPS and the customers will receive good quality products. Some of the mechanical properties that are being specified in the WPS are strength, toughness, durability, and much more.

What is PQR?

PQR contains the original method of preparation, testing, and quality test results of the product. It is the document that has the final results of all the tests conducted on the product.

It also enables and ensures the welder that this product is safe and worthy to be redesigned, manufactured, or replicated in future years.

The observations and inference obtained from the tests are documented in this to provide easy, appropriate, and standard access to people who would like to consider the purchase of the product and replication.

The results also include that of the tensile tests and also guided bend tests. It also discloses the name of the welder who has manufactured, the person in charge of inspection, and also the names of the people who were involved in making observations from tests.

Main Differences Between WPS and PQR

1. documented after the production of the product.
2. WPS is used inside the industries whereas PQR is used outside the industries.

Conclusion 

These documents apart from the similarities vary in a few features and orientation is one among them. These documents have their own unique way of orientation.

Its main purpose is to make sure the quality of the product is high and it is safe to be in use. It is also prepared on the basis of considering replication and bulk manufacturing of the products in the future.

PQR consists of all the related information and data in addition to the information of welding whereas WPS doesn’t consider much information of the PQR.

References

1. https://www.koreascience.or.kr/article/JAKO201608450940747.page
2. https://inis.iaea.org/search/search.aspx?orig_q=RN:41116877