“I was truly surprised by the results from our initial testing and am now looking at all of our equipment problems to find other areas where this technology can help us”
Post Weld Heat Treatment, often simply referred to as PWHT, uses the application of heat to reduce and redistribute residual stresses in weldments. PWHT is one of the most common methods of stress relief and is used in a wide-range of industries and high-pressure applications where brittle fracture is likely to occur.
While PWHT definitely provides some benefits it also has some significant challenges. If not performed properly Post Weld Heat Treatment can actually harm the material properties of the treated component. In addition, it often cannot be applied to a tightly controlled area and can take a substantial amount of time to apply.
Ultrasonic Impact Technology, or UIT for short, uses ultrasonic energy to improve metal, reduce residual tensile stress in critical zones and introduce beneficial compressive stress where it is most needed. The technology was developed and first brought to market by Progress Rail's Ultrasonic Technology (UIT) Division and is specifically designed to be applied to welds. The Ultrasonic Impact Technology is portable and can be applied by a single technician using a handheld tool. Unlike heat treatment, UIT can be applied in hard-to-reach places and even robotically. This flexibility makes it the perfect solution for field, shop, manual or automated applications. As a result, UIT has proven to be an extremely safe, efficient and effective method of stress relief and is currently utilized in oil and gas, defense, shipbuilding, mining, infrastructure maintenance (weld treatment on bridges) and a host of other industries.
Faster, easier to apply, more precise and controllable! Ultrasonic Impact Technology has many benefits compared to traditional post weld heat treatment. Learn more about UIT from Progress Rail and how you can use UIT in your industry to relieve stress from welds.