When dealing in ultrasonic testing with inhomogeneous material structure data interpretation can be rather difficult. This is especially the case when using anisotropic dissimilar welds made from austenitic steel or nickel based alloys, which are currently used for modern power plant concepts. For better understanding of the complex interaction between the sound field and the component under te...

I. TECHNICAL PROGRESS The objective of this program was to seek improved process control and weldment reliability during laser welding of automotive aluminum alloys while retaining the high speed and accuracy of the laser beam welding process. In particular, we undertook a comprehensive experimental and theoretical research to understand the effects of various welding variables on the loss of a...

Resistance spot welding is one of the most widely used processes in sheet metal fabrication. Improvements in quality assurance are important to increase welding productivity. Until now, quality estimation was performed using dynamic resistance at the secondary circuit, which is easily measured. However, this method has many problems when applied to in-process real-time systems. In this study, w...

Defects detection is very important to guarantee the welding quality. Many researchers have been done on this area. However, most of them are limited in efficiency. Different from these researches, a method that is used to detect defects from the radiographic images of welding is put forward. This paper discusses an effective method to segment of the defects in welding images. We also use Two D...

Fast Breeder Reactor (FBR) steam generator assembly, is a shell and tube heat exchanger. In this equipment, steam is generated by the transfer of heat from sodium on shell side to water on tube side. Due to inherent dangers of sodiumwater reaction, the integrity and leak tightness of weld joints separating sodium and water/steam is very important. The tube to tube sheet (TTS) weldsin steam gene...

the present article considers the nd:yag pulsed laser welding of 304 stainless steels with two different compositions. the effects of various laser operational parameters and cooling rates on the weld microstructures were considered. the results show that ferritic solidification is produced in the stainless steel with the creq/nieq ratio of 1.7, and austenitic solidification is produced in the ...

Radiography is one of the oldest and the most widely used NDT method for the detection of volumetric defects in welds and castings. Once a radiograph of a weld or a casting or an assembly is taken, the radiographer examines the same. The task of the radiographer consists of identifying the defects and quantitatively evaluating the same based on codes and specifications. Radiographic interpretat...