Tanks and pressure vessels are used to store and transfer liquids and gases under high pressure. Welding on pressure vessels must be extremely high quality to withstand working conditions. From food processing and fermentation through to nuclear waste storage and pharmaceutical processing, tanks and pressure vessel are used in a myriad of industries to both store and transfer liquids and gases under high pressure. Given the critical nature of pressure vessels, the welds used in their fabrication undergo a rigorous quality control and assurance process, including X-ray inspections, ultrasonic testing and a variety of other forms of non-destructive testing (NDT).