Have you ever been in a situation in which you need a qualified welding procedure immediately? Maybe you just failed an audit and have to halt production until a valid welding procedure is provided. Or maybe you’re just in a hurry to get started with a new job. Regardless of the reason you need the […]
Preheat is used when a base material, due to its chemical composition, thickness or level or restraint, is susceptible to cold cracking (hydrogen induced cracking). Knowing what temperature to preheat your base metal is sometimes a complicated matter. You may hear people say “preheat to 300F to be safe.” The reality is that 300F may […]
Prequalified welding procedures must adhere to the strict requiremnts of the welding codes which permit their use. AWS D1.1 Structural Welding Code (Steel) is one that allows their use. Prequalified WPSs are exempt from testing becasue there is reasonable assurance that as long as all the requirements are met the deposited weld will be sound […]
If you have taken or hope to take the CWI exam you probably have searched for some practice exam questions. In practicing for the code book portion of the test you may have come across a few questions for which you could find the answer, but didn’t really understand the importance of the question or […]
If you are a CWI, welding engineer or serve in a capacity that requires you to use and interpret welding codes, you probably have run into instances where the code is not very clear. Many of the questions we receive from our readers deal with interpreting codes and standards. Many times it is not about […]
Have you ever seen a welding procedure specification with established amperage ranging from 200 to 550 amps? Or voltage ranging from 21 to 29 volts? Or some other variable with a huge window? This is all too common, but extremely dangerous. Why? Because changes to essential variables beyond that which is reasonable will affect the […]
A qualified welding procedure is a welding procedure that has been proven to produce sound welds after undergoing extensive testing. When using structural welding codes, these tests include both destructive and nondestructive tests. Some of these tests are: Visual examination Macroetch Break test Bend test Ultrasonic inspection Radiographic inspection Hardness test Tensile test The reason […]
One of the advantages of using prequalified welding procedures is that you can save a lot of time and money because they are exempt from testing. This means you don’t need to perform any destructive or nondestructive testing. You simply follow the requirements of AWS D1.1 and you can write a prequalified welding procedure and […]
The following FAQ are related to 322 Prequalified Welding Procedure Specifications for Steel Fabricators. To learn more or to get your copy simply click here Is this a physical book? No. The procedures are provided as digital files (PDF) and are available for immediate download. The user has the option to print the files […]
Heat input is important because it has an effect on cooling rates which in turn can significantly affect the mechanical properties of the weld and heat affected zone. It also plays a role in susceptibility to distortion. High heat input can be beneficial in some cases and detrimental in others. A common misconception is that […]
