Welding Procedure Development: Qualification
Developing welding procedures requires an understanding of all the different essential variables as well as the process of qualifying or prequalifying such procedures.
Welding Procedure Development: Selecting Welding Parameters
When writing a welding procedure one of the most critical steps is selecting our welding parameters. This means determining the appropriate amperage and voltage as well as other critical aspects that the welder must adhere to such as travel speed and travel and work (transverse) angles. What follows is an explanation as to the importance […]
Welding Procedure Development: Selecting the right filler metal
Selecting the filler metal should not be a trivial matter. The easy way out is to select a filler metal that has matching strength, meaning that the minimum specified tensile strength of the filler metal matches that of the base metal. However, this is not always the best option. In some cases it may be beneficial to use undermatching filler metals. There are many factors to consider when selecting the right filler metal. Understanding requirements in the areas of strength, ductility, wear resistance, corrosion resistance, in-service demands, cost and productivity is essential.
Welding Procedure Development: Selecting the right welding process
Selecting the best welding process is a critical step in developing a welding procedure that attains the desired quality and optimizes productivity. Many times we look for the welding process that can give us the highest deposition rate to optimize productivity. However, every welding process has limitations. For example, submerged arc welding (SAW) has extremely […]
Who should develop welding procedures?
Developing a welding procedure is the responsibility of the welding engineer. Most fabricators don’t have a welding engineer on staff and require that those with the most welding knowledge develop the WPS. Many times this falls in the hands of the certified welding inspector (CWI).
Welding Stainless Steel to Carbon Steel
Welding of austenitic stainless steel and carbon steel base metal should use a filler metal that prevents solidification cracking. 309 is the preferred filler metal as it provides ferrite number of at least 3.
Special considerations for welding Stainless Steel
Stainless steels possess many properties that make them different from those of carbon steels. These differences provide certain advantages, such as corrosion resistance, but we must be aware of some of the intricacies of welding stainless steel to avoid problems. Many welding professionals, including welding engineers, that have worked primarily with carbon steels develop welding […]
How to write AWS D1.1 Prequalified Welding Procedure Specifications
Learn to write prequalified welding procedures in conformance with AWS D1.1 Structural Welding Code. Follow this step-by-step guide to writing your first prequalified welding procedure today!
Troubleshooting Welding Burn-through
Burn-through is a common defect in welding of light gauge materials. It is typically results in costly scrapping of parts since it can be difficult to fix. Or, if left in place when there are not structural integrity concerns it looks awful and portrays extremely poor quality. The following is an excerpt from our guide: […]
Understanding the Difference between Qualified and Prequalified Welding Procedures
One of the most common questions we get around the topic of welding procedure qualification is regarding the differences between qualified and prequalified welding procedures. The main question is typically: is one better than the other? Before we answer this question, let’s first discuss the need for qualified, or prequalified, welding procedures. If you have […]