What is the difference between wps and pqr

Bit of a basic question really PQR, sometimes referred to as a WPQT - Weld Procedure Qualification Test tests the weld using various destructive tests to demonstrate that the weld procedure works and results in a weld that is stronger than the parent metal and doesn't introduce any brittleness into the weld area.

This can take some time to complete before it is all tested and approved, usually by a testing house. Each WPS should also have a list of welders qualified under that WPS, either the welder that did the test or any new welder where the first production weld, which is then subject to NDT, qualifies him for that welding peocedure. Good luck! El que no puede andar, se sienta.

Thank you very much, Redpicker and Littleinch. If I had to guess, QW Once again, thank you Redpicker. You have explained my query satisfactorily. Red Flag This Post Please let us know here why this post is inappropriate.

Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. A WPS is usually filled with numerous texts, images, and sentences in accordance to its being an instructional guide.

On the other hand, a PQR is like a checklist with blank lines and spaces for written notes that will be filled out by the inspector during the inspection. Before the inspection, the WPS document is the object of attention of the welders. PQR is more like an official document whereas the WPS is the document that is used in the workshops or industries. 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.

The person who prepares this document is a qualified official who has the knowledge of providing reliable and accurate results. 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. While WPS has texts, pictures according to the instructions specified in the given guide. Its main purpose is to make sure the quality of the product is high and it is safe to be in use. It has been compared to a recipe for welders.

When cooking a roast, the recipe includes all the ingredients you need, plus the actual steps you will need to make sure the roast works out right and is repeatable. A WPS is very similar. It includes details on what you will need and the welding processes to follow that will create a sound weld. However, instead of listing type of meat, barbeque temperature, time you should for, a WPS lists information such as base metal grade, amps, volts and travel speed along with many other details.

The WPS is a proven process of welding and is important to ensure welding operators in the field are maintaining the same, required standards across the board.

The mechanical properties of a weld cannot be verified in production welds after welding so control of the welding process using a WPS is critical. If either a novice or experienced welder follow the WPS, they should be able to produce welds with similar mechanical properties. This helps new welders grow to the same level as experienced welders.

It ensures clients are receiving serviceable welds that are the strength, toughness and soundness required by the design. A WPS always has ranges to allow for joint and operator technique variation, it is unlikely every joint is the same or every welder uses the same technique.

These ranges are different for every standard. The ranges are based on what is known as essential variables. Things which if changed require you to requalify the WPS. It is a record of the test.