The Measurement of Hardness and Elastic Modulus of non-Metallic Inclusions in Steely Welding Joints
Journal Title: TEM JOURNAL - Year 2015, Vol 4, Issue 3
Abstract
Trunk pipelines work under a cyclic dynamical mechanical load because when oil or gas is pumped, the pressure constantly changes - pulsates. Therefore, the fatigue phenomenon is a common reason of accidents. The fatigue phenomenon more often happens in the zone of non-metallic inclusions concentration. To know how the characteristics of nonmetallic inclusions influence the probability of an accident the most modern research methods should be used. It is determined with the help of the modern research methods that the accident rate of welded joints of pipelines is mostly influenced by their morphological type, composition and size of nonmetallic inclusions, this effect is more important than the common level of pollution by non-metallic inclusions. The article presents the results of the investigations of welded joints, obtained after the use of different common welding materials. We used the methods, described in the state standards: scanning electronic microscopy, spectral microprobe analysis and nano-indentation. We found out that non-metallic inclusions act like stress concentrators because they shrink, forming a blank space between metal and nonmetallic inclusions; it strengthens the differential properties on this boundary. Nonmetallic inclusion is not fixed, it can move. The data that we have received mean that during welded joints’ contamination (with non-metallic inclusions) monitoring process, more attention should be paid to the content of definite inclusions, but not to total contamination.
Authors and Affiliations
Ignatova Anna, Ignatov Mikhail
Keywords
Related Articles
- EP ID EP132740
- DOI -
- Views 158
- Downloads 0
Security Measures Against Malware Penetration and Spreading
As the title implies the article describes the problems of protection against malicious programs. The widely used method of protection, which is currently the signature analysis, is described. Also the article considers...
Investigation of Partially Crystalline Zr77Ni23 Metallic Glass
This paper presents the results of an extensive research of partially crystalline Zr77Ni23 metallic glass (indicated numbers refer to atomic percentages). The partially crystalline Zr77Ni23 samples were prepared by...
Hand Detection Based on Skin Color Segmentation and Classification of Image Local Features
–This paper presents a hand localization method. It built using adaptive skin tone segmentation and identification of image keypoints specific for a hand. Details about skin detector implementations p...
Model Based Design and Hardware in the Loop Testing in Power Electronics Courses
In this paper a low cost virtual test bed for educational purposes is developed and tested.Hardware-In-the-Loop (HIL) design concept as an experimental part of power electronics is considered. Software si...
Mathematical Model of Induction Heating Processes in Axial Symmetric Inductor-Detail Systems
The wide variety of models for analysis of processes in the inductor-detail systems makes it necessary to summarize them. This is a difficult task because of the variety of inductor-detail system configurations. Th...