The Ultrasonic Phased Array Inspection Technology Used in Tubular Joint Welds of Offshore Platform Structures
Aimed at the practical requirement of tubular joint wel ds inspection of offshore platform structures, the ultrasonic phased array inspection algorit hm for offshore platform structures is proposed in this paper, and the ultrasonic phased array inspec tion system for offshore platform structures is developed. The experiment of tubula r joint model is performed with the ultrasonic phased array inspection system for offshore platform structures, the flaws characteristic could be exactly estimated and the flaw s size could be measured through ultrasonic phased array inspection software system. Expe riment results show that the ultrasonic phased array inspection algorithm for offshor e platform structures is feasible, the ultrasonic phased array inspection system could detect fl aws in tubular joint model, the whole development trend of flaws is factually imaging by the ul trasonic phased array inspection technology of offshore platform structures.
Groundwork for Rail Flaw Detection Using Ultrasonic Phased Array Inspection
An apparent increase in the detectability of certain flaws results when the ultrasonic inspection beam was oriented off the longitudinal axis of railroad rail. Here, artificial reflectors were used to better define the extent of material “seen” by inspection beams, and determine how surface curvature might affect the inspection. Presumably, such information could be useful for suggesting optimum positioning of linear array probes in testing, and help determine the validity of simulation models of this inspection for various cases.
IMPACT OF STRONTIUM, MAGNESIUM AND NICKEL ON MECHANICAL PROPERTIES OF Al-5 Si-3 Cu (A319) ALUMINIUM ALLOY
1Workshop Instructor, Sreerama Govt. Polytechnic College, Thriprayar, Thrissur 2Professor, Dean, Faculty of Engineering CUSAT, Kerala, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Aluminium and its alloys have number of applications, mainly, in the field of aerospace and automobile industry. A319 (Al-Si) based alloys are used in cylinder heads, engine blocks, suspension etc. The major drawback for this alloy is that of low tensile strength (180 220MPa). Porosity also is a major problem in high pressure and gravity die casting process used for the manufacturing of components. In the present work the major aim is to study the effects of alloying elements Strontium, Magnesium and Nickel in the mechanical properties ofA319. Development of porous free castings using Stir casting technique is also an objective of this work. Six castings were developed for this study (A319, A319 – 0.04Sr, A319 0.05 Ni, A319 –0.5Mg 0.04Sr and A319 – 0.5Mg – 0.5Ni – 0.04Sr). The microstructure and EDAX analysis were done to identify the phases present. Different mechanical tests were carried out to study the effect of these alloying elements on basic A319 alloy. The results showed that these alloying elements have a positive influence on A319 alloy. It is seen that the tensile strength of the material has improved for each alloy composition and maximum tensile strength is obtained as238 MPa for A319 – 0.5Mg –0.5Ni – 0.04Sr alloy.