What is a Welding Procedure Specification (WPS)? 6 steps to write and understand one
August 22, 2018
Whether you are an occasional welder or a professional experienced one, WPS will play a key role everytime you need to perform a weld. In a trade like Welding, attention to detail and specifications is crucial, so every welder must be really clear on all the details a weld requires.
The main objective of a WPS is to serve as a guide that allows the welder to perform welds that are safe, repeatable and efficient. In other words, they serve as the manual you need to follow to perform a high quality weld.
What is a WPS?
A WPS or Welding Procedure Specification is the written document that contains all the information a welder requires to start a welding process. Position, gas, technique, base material, filler metals… are some of the variables that must be featured. A WPS may seem confusing and difficult to understand for new welders, but it is one of the most relevant documents in the welding field and that is why they are an important part of welding training. How should it be written? The best way to do it is using an example of a real WPS and following these steps:
All the basic information about the welding procedure:
Name of the company and person who developed it
Specification number and date
Most WPS will be backed on a PQR (Procedure Qualification Record), you should refer to it in order to make it easy to trace the document back.
Number and date of the last revision
Welding processes and type
Details of the joint design, including root spacing and backing (if the joint needs it and the backing material). This information should feature a graphic representation of the joint to make it easier for the welder.
Base and filler metals:
Information about the base and filler metals that are going to be used in the welding procedure. You should specify the weld type (fillet or groove) and the thickness range of the base metal.
Pre and post weld heat treatment required, gas used and the positions in which the procedure will be performed. The welding progression should be specified if it is required.
Information about each weld pass, including:
Filler metal classification and diameter
Current type and polarity
Wire feed speed range
Energy of power range
Travel speed range
Other electrical specifications
String or weave bead
Orifice, nozzle or gas cup size
Initial and interpass cleaning
Method of back gouging
Contact tube to work distance
Multiple or single pass (per side)
Multiple or single electrodes
Knowing how to write and understand a WPS is key in welders’ training, that’s why real WPS can be introduced in the Soldamatic Augmented Training welding simulator. This way trainees can learn how to understand a WPS and subsequently practice that same procedure with Augmented Reality.
Why do you need a WPS?
The Welding Procedure Specification is a crucial document for a company and its quality standards. It is not just a document with all the information that the welder requires, but it is also the guideline to guarantee that the weld will follow the high quality standards required.
From the welder’s perspective, the WPS will provide all the information needed to perform the weld, so the first step any welder should take is going through the document and make sure all the specifications are understood and followed.
For companies, WPSs are so important that they are legally required in certain industries to make sure a tested and safe weld is performed, it would be accurate to say that they are not only a quality requirement but also a legal one!
Cookies estrictamente necesarias
Las cookies estrictamente necesarias tiene que activarse siempre para que podamos guardar tus preferencias de ajustes de cookies.
Si desactivas esta cookie no podremos guardar tus preferencias. Esto significa que cada vez que visites esta web tendrás que activar o desactivar las cookies de nuevo.
Third party cookies
This website uses Google Analytics to collect anonymous information such as the number of visitors to the site, or the most popular pages.
Leaving this cookie active allows us to improve our website.
¡Por favor, activa primero las cookies estrictamente necesarias para que podamos guardar tus preferencias!