With respect to shielding gases AWS D1.1 states the following: A procedure qualification record (PQR) requires requalification when “A change in shielding gas from a single gas to any other single gas or mixture of gas, or in the specified nominal percentage composition of a gas mixture, or to no gas”.
In developing a WPS for gas metal arc welding (GMAW) or gas tungsten arc welding (GTAW), there are many variables which must be taken into account such as voltage, amperage, electrical stick-out, and shielding gas, these variables and others are called essential variables as defined in AWS D1.1, Structural Welding Code. These procedure specifications give the welder or welding operator the recipe to produce acceptable welds on a given application time after time. In order to maintain a stable consistent welding process, and assure repeatable results, welding procedure specifications (WPS’s) are implemented. Whether your goal is ISO certification or maintaining your own internal quality program, you must be confident that: A) your processes are consistent and repeatable, and B) the products being used in production meet specific requirements, and specifications. Every time! In today’s manufacturing environment, quality and consistency are key requirements of any quality assurance program. Are You Welding with a Shielding Gas that conforms to AWS Specification A5.32?
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