Nr. 4/2015

 
 

Welding Journal 4/2015

The articles are published in Romanian and English languages

 

Risk Engineering of Load-Carrying Structures Part I – Basics of failure risk assessment Prof. Dumitru Dragoș Cioclov (1) (1) Honorary Professor of Politehnica University from Timisoara e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract Essay is dedicated to the reliability of load-carrying structures in operations under varying circumstances of loading and environment actions. The debuts is made by making explicit the concept of risk in engineering view. The definition of risk is expressed in terms of frequency of damage and failures occurrence and their associated severities. In this approach are evoked, in the modern context of inspection procedures, specifically, the non-destructive testing, applied for the assurance of structural integrity in service. The exposure is constructed around the quantification of probabilities of structural materials damage and failures which might occur in service. There are treated, in probabilistic terms, an adequate paradigm for numeric quantification of risk for the purpose of decisions substantiation regarding structural health, their reliability and the possibility of structural life extension under secure operations. There are evoked advanced mathematical methods and computation procedures in consonance with impetuous development of digital computation technology. There are presented comprehensive statistical data gathered over a long time period from varied domains in which load-carrying structures operate. There are met in evidence connections and interactions with economic, social and politic milieu.

Technological solutions for preventing hydrogen induced cracking when repairing by welding hydrocarbons transmission pipelines – Part I Prof. Gheorghe Zecheru (1), Dr. Marius Florin Barsan (2), Dr. Andrei Dumitrescu (1), Dr. Gheorghe Draghici (1) (1) Universitatea Petrol – Gaze din Ploiești, (2) S.N.T.G.N. „TRANSGAZ” Mediaș e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract When repairing the defective areas of the transmission pipelines intended for petroleum, liquid petroleum products and natural gas, using procedures which include fusion welding operations executed onto out of service or in-service pipelines, two unwanted phenomena could take place: burn through of the pipe wall due to the action of the electric arc used as an energy source for welding and hydrogen induced cracking (also named cold cracking or delayed cracking) of welded joints. This paper presents the results of a theoretical and experimental research program aiming at tracing and ranking according to their importance the factors that determine the occurrence of the second phenomenon and at assessing the technical and technological solutions which avoid its triggering and ensure the good quality of the welded joints when repairing transmission pipelines by welding.

TMIG/MAG welding performances improvement by using HPS transfer Ing. Adrian Banu (1), Dr. Luigi Renato Mistodie (2), Dr. Carmen Cătălina Rusu (2) (1) DUCTIL S.A., Buzau (2) Facultatea de Inginerie, Universitatea „Dunărea de Jos” din Galați e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract This paper presents a complex experimental research program that aims to highlight the performance of the gas metal arc welding (GMAW) process, using a new type of mass transfer called High Penetration Speed (HPS). Using programmable equipment, including type invertor technology can also control and linear energy introduced in process. The new type of mass transfer, HPS combines the advantages of using high wire feed speeds and low heat input, in comparison with the standard spray-arc transfer (SA). In the first part of the paper, the research targeted the analysis of thermal field produced by the GMAW process for the two types of transfer, SA and HPS, using infrared thermography method. The experiments have focused on deposits and welds on E36 steel sheets with 8 and 20 mm thickness, using two types of transfer SA and HPS and two gas mixtures Ar + 18% CO2 (G1) and Ar + 8% CO2 (G2) respectively. In the second part of the paper, the experiments focused on the physical aspects and characteristic of the welding arc, in case of the two types of transfer and shielded gas, and the estimation of the chemical composition of the deposited material. After the analysis of experimental results and comparison between the two types of mass transfer, important advantages and benefits of using the new developed HPS transfer are highlighted.

❯ THE SOCIETY INFORMS YOU

  • ASR Conference ”Welding 2016”, Piteşti, 14-
  • 15.04.2016
  • Welding European Contest WELDCUP 2015
  • Welding Training School from Damen Shipyards Galati
  • ASR Professional contest ”The youth is welding” 2016
  • ASR Gouverning Council meeting, Buzau, 28.10.2016
  • ASR Conference of welding coordinators, Buzau, 29-30.10.2015
  • Personals
  • Award of ASR medal ”Acad. Corneliul Mikloşi”
  • Prices for advertisments in Sudura journal 
  • for 2016
  • ASR fees for 2016
  • Calendar of scientific events 2016
  • List of companies with advertisements in SUDURA 4/2015