Journal SUDURA (Welding)

Nr. 2/2015

 
 

Revista Sudura 1/2015

The articoles are published in romanian and english languages

 

Checking the Strength and Toughness of the Welded Joints Performed for the In-Service Repair of Transmission Pipelines Prof. dr. ing. ZECHERU Gheorghe (1), Dr. ing. BIRSAN Florin Marius (2), Conf. dr. ing. DUMITRESCU Andrei (1), Conf. dr. ing. DRAGHICI Gheorghe (1) 1) Universitatea Petrol – Gaze din Ploieşti; 2) S.N.T.G.N. „TRANSGAZ” Medias e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract The qualification of the welding procedures required for the repair of in-service transmission pipelines is typically based upon the mechanical strength and toughness properties, determined by testing some specimens containing the welded joints performed, complying with the requirements of some preliminary specifications, on test pieces obtained by applying by welding, on a pipe section through which a cooling fluid is circulated, a sleeve made of two semi-cylindrical components (type B sleeve). In order to check the mechanical properties of the welded joints which are carried out (using welding procedures qualified in such manner) for the repair of transmission pipelines with different working regimes (characterized by pressure, flow rate and velocity of the transported fluid), the authors have proposed the following technical solution: a. deposition of some weld runs (single or multiple) or the application of welded small plates onto the in-service pipelines (with a given operating regime); b. extraction of coupons containing the runs deposited by welding or the welded small plates, using the hot-tapping and stoppling equipment and technologies for pipelines; c. checking, by means of tests and examinations carried out on specimens and samples cut from the extracted coupons, the microstructure and mechanical properties of the welded joints.

The paper presents the types of investigations and tests which have to be performed on the samples and specimens cut from coupons in order to be able to obtain a pertinent characterization of the quality of the welded joints executed on the in-service pipelines and the manner in which a consistent database can be built to underlie the range of welding procedures qualification. Key words: transmission pipeline; maintenance work; in-service pipeline repair; repair by welding; qualification of welding procedures; quality assurance of welding joints.

Aspects of the use of welding standards as reference standards in the application standards for welded products Ing. Petru Tenchea Presedinte ASRO/CT 39 – Sudare si procedee conexe e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract The welding and allied processes related standards were created to have a general character, for the use in as more as possible industrial fields. The New Approach has created the framework for the preparation of many European standards families for welded products. These standards use the general welding standards as reference standards. In this work, the application standards families (pressure equipment, construction products, railway application, pipelines of the gas infrastructure...) are synthetically presented, including the relations with the European Directives/Regulations and the general welding and allied processes related standards. Key words: swelding standard; application standard; reference standard; ISO; CEN

Development of the welding engineers training in Romanian higher education Prof. dr. ing. Radu Iovanas - Universitatea Transilvania din Brasov e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract We consider a debt of honour, honouring founders „welding” specialization in higher education in Romania, the beginnings and subsequent crossings with changes produced in the country at both the industrial and changes Romanian education in the last 25 years. The work consists of gathering and ordering data and information on the evolution of specialization WELDING, from the place of origin and initial development, to Politehnica University of Timișoara, continuing with the creation and development explosive (1978), in several universities in Romania, respectively Bucharest, Galati, Brasov, later in Constanta, Craiova – Drobeta Turnu Severin and for short periods in Arad, Resita, Oradea, Iasi and Cluj - Napoca. It presents the current state of civil welding engineering specialization in Romania after the new system under the Bologna reforms, the license (4 years), master (1.5-2 years) and PhD, and a statistical test to graduate after 1979 / 1980 nationwide (over 6000 graduates!) and each university. Welding Engineering Specialization (WE) is one of the few specializations in the field of Industrial Engineering, who remained higher technical education in Romania and was improved over time and is characterized by personality and unanimous recognition, confirming that: „In life and in nature is nothing without ... Welding!”

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  • ASR General Assembly and Conference “WELDING 2015”, 22-24.04.2015, Arad
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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.

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  • ASR Conference ”Welding 2016”, Piteşti, 14-
  • 15.04.2016
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Nr. 3/2016

 
 

Welding Journal 2016

The articles abstracts are published in Romanian and English languages

 

Quality of welding consumables. Status and trends in European and international standardization Ing. Petru Tenchea, Presedinte ASRO/CT 39 – Sudare si procedee conexe E-QSE CONSULTING S.R.L. Timisoara e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract The activity of ISO/TC 44/SC 3, IIW and CEN/TC 121 and the cooperation between the three organizations are presented. The matrix of ISO Filler Metal Draft Standards, prepared by IIW Commission II, adapted and updated, gives information on the status and the trends of the international / European / Romanian standardization in this field, based on the cohabitation approach.

 

 

TOPTIG - a welding process with high productivity and quality Jean-Marie Fortain (1), ), Laurent Rimano (2), Viwek Vaidya (2), Viwek Vaidya (4) (1) Air Liquide Welding and Cutting Research Centre, (2) Air Liquide Canada, (3) Ductil SA Buzau , e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract Gas tungsten arc welding (GTAW) is widely used in manufacturing for manual, automatic, and robotic applications. The main advantage of this process is the high quality of welds and good appearance of the seam without spatter or slag. However, on the downside, GTAW is limited in terms of welding speed and penetration compared to other robotic welding processes. For this scope we have developed a new process for welding parts with small thickness (0.8 - 4 mm), which combines quality TIG process, with good features high welding speed and good penetration of the process of arc welding with fusible electrode in protective gas (MIG / MAG). The key part of this technology is an original torch design concept. The new welding process, in the name TOPTIG is patented by Air Liquide Welding group. Filler material is oriented at an angle (optimum), crossing the gas nozzle and is very close to the tungsten electrode. This configuration provides the advantage of reduced overall dimensions of accessibility and good head for welding, robotic welding for parts with complex shapes and sizes. The tests were conducted under Air Liquide Welding group for various applications on thin sheets of various qualities: carbon steel, stainless steel, coated parts (galvanized sheets).

TPS/i – Solutions for the robotisation of arc welding processes applied to the transport vehicle parts S. l. dr. ing. Luigi Renato Mistodie (1), Ing. Alexandru Joni (2), S. l. dr. ing. Carmen Catalina (1) (1)Universitatea “Dunarea de Jos” din Galati, (2) ROBCONTM S.R.L. Timisoara e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract The paper presents the state of the art related to the technological solutions for the arc welding processes robotisation which are applied to the subassemblies of transport vehicles. In the first part of the paper, traditional and modern arc welding processes applied to the transport vehicle subassemblies are presented as well as the new range of base and filler materials used in the manufacturing processes are described. In the second part of the paper, the authors conduct an investigation on the types of welded joints used in the manufacturing processes from automotive, railway and aerospace industries, in order to achieve specific correlations between welded joints characteristics and the appropriate robotised technological solution. Finally, several applications using modern robotic systems, specific to the automotive, railway and aerospace industries are considered, that highlights the improvement of the manufacturing processes productivity and welded joints quality.

Welding engineering” specialization at „Dunărea de Jos” University from Galaţi Prof. dr. ing. Danut Mihailescu (1) (1) Universitatea “Dunarea de Jos” din Galati e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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• A new book • ASR Conference “Welding 2017”, Iasi, 6-7 April 2017 • Calendar of scientific events 2016 • The annual ASR Confernce of welding coordinators, Galaţi, 6-7 October 2016 • For standards users • ASR course of international designer of welded structures – comprehensive level • Romanian team participation at the international contest „ARC CUP 2016”, Beijing • A new book • Press release – Flexifab project • New Erasmus+ projects approved in 2016 • Erasmus+ project of „Dunarea de Jos” University from Galati

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Nr. 2/2016

 
 

Welding Journal 2/2016

The articles are published in Romanian and English languages

 

The effects of the run lengths on the validity of the welding procedures in the particular cases of repair welding Viorel Miclosi (1) (1) Bucuresti e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract Because of the fact that the cooling rates are much greater in the case of nonstationary thermal field by welding, in report to the quasistationary thermal field, generally speaking, the welding procedures specifications established for normal welding, repair welding with short raws need special welding procedures. Some solutions for the special repair welding procedures are presented.

The reduction of the filler material consumption using two wire Tandem MAG robot welding, as compared to SAW + MAG Daniela Maria Iovanas (1), Cosmin Toma (2), Radu Iovanas (1) (1) Universitatea Transilvania, Brasov, (2) Arcelor Mittal Tubular Products, Galati e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. 

Abstract This article presents the consumption of filler materials (wire and gas) in 2-wire Tandem MAG robot welding, as compared to SAW + MAG welding of 12 mm thick X52 MS steel plates. The analysis was performed on horizontal butt welds with Y-joints (unilaterally with 2 and 3 welding seams) and X-joints (with two bilateral seams). The joints were achieved using a welding robot, with a two-wire Tandem MIG / MAG welding head, supplied by two welding sources, with the possibility of programming all the welding parameters (Is, Ua, Vas,) for each filler material wire, as well as of the welding speed, Vs. The experiments were conducted by positioning the welding head so as to obtain welding seams, once with the wires placed one after the other (tandem), or alternatively across (perpendicular on the welding direction), obtaining, through correlation with the welding speed, optimal linear energies and, implicitly, seams of different widths and degrees of penetration. 

TPS/i – New possibilities and technologies for automotive Industry Jürgen Bruckner (1), Dr. Gerhard Posch (1), Goran Dzomba (1), Stefan Höglinger (1) (1)Fronius International GmbH e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Abstract The TPS/i power source is the successor of the TPS. But it is not only a successor, it is also a real evolution of already proven technology. All the experience and the knowledge about MIG/MAG welding, which has been collected with the TPS and the CMT technology, has been put into the new system. Besides the introduction of new technologies like PMC (PULS Multi Control) and LSC (Low Spatter Control) some brand new features like “arc stabilization control” and “short arc control” have been implemented into the new system. These functionalities lead to new possibilities and benefits for the automotive industry in welding, which are explained and shown in this paper by use of industrial applications. 35 generations of “WELDING” at TRANSILVANIA University of Brasov - Engineering and Research Prof. dr. ing. Radu Iovanas (1) (1) Universitatea Transilvania din Brasov e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it. Rezumat This paper presents the evolution of the “WELDING” specialization at “Transylvania” University of Braşov, occasioned by the graduation of the 35th class. Starting from the recognition of the place of origin and initial development of the specialization at the “Polytechnic” University of Timişoara in 1952/1953, it depicts, gradually the initiation, evolution and achievements obtained in Braşov since its establishment in 1977/1978, at the same time with the beginning of the activity in the Universities of Bucharest and Galati. It presents briefly the two aspects of the teaching and research activities which took place concomitantly and overlapped each other. THE SOCIETY INFORMS YOU

• A new book • Personals • ASR course of international/European welding engineer – 2016 / 2017 • Calendar of scientific events 2016 • ASR members at Metalshow exhibition 2016 • ASR course of international welded structures designer • List of companies with advertisements in SUDURA 2/2016 • ASR training programme - semester 2 / 2016 • ASR events from April 2016, Pitesti • The list of books available at ASR Secretariat

Nr. 4/2016

 

 

 

Revista Sudura 4/2016

The abstracts are published in romanian and english languages

 

 European standards harmonized with the European Directive on machinery, applicable in welding and allied processes

Petru Țenchea, President ASRO/CT 39 – Sudare și procedee conexe, E-QSE Consulting SRL Timișoara, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: The three types of safety standards, based on the Directive on machinery are presented, with examples. Some terms and definitions from the A type standard EN ISO 12100:2010, Safety of machinery – General principles for design – Risk assessment and risk reduction (ISO 12100:2010) are detailed. The tow specific standards for welding and allies processes are presented (EN ISO 15012-4-2016 – Equipment for capture and separation of welding fume – Part 4: General requirements, a type B standard, and EN ISO 17916:2016 – Safety of thermal cutting machines, a type C standard). Keywords: European Directive, harmonized standard, welding, allied processes, welding fume, thermal cutting machine.

 Practical aspects of the coordination of thermal spraying activities

Florica Dumitrașcu, FAN WELDING CONSULTING SRL București, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: The tasks and responsabilities of the thermal spray coordination personnel are highlighted. New information on the standardization of coating specification, of thermal spray procedure specification and of qualification of thermal sprayers are given. All the requirements are focused to the satisfaction of EN ISO 14922 requirements. Keywords: thermal spraying, thermal spraying coordination, specification, procedure specification, qualification, standardization.

 

 Welded steel structures – Execution classes according to SR EN 1090

Anamaria Feier1), Radu Băncilă2), Edward Petzek2, 3) 1)Asociația de Sudură din România, 2) Universitatea Politehnica din Timișoara, Facultatea de Construcții și Arhitectură, 3) SSF RO SRL Timișoara e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract: The importance of standardization for the welded steel construction industry is well evidenced by the examples which occur day by day in the factory, on site or even in the early stages of design. This paper highlights the fact that the designer, the customer and the constructor all must attach great importance to the strict conformity to the standards; communication between designer - beneficiary - constructor is very important. The decision to apply for a particular consequence class and execution class of a structure or some elements of it is very important; if from the beginning the choice of a consequence class or execution class is incorect can occur unpleasant events. Sometimes a wrong decision may even lead to the collapse of the structure. Through the examples presented in the paper highlights the importance of framing a structure or its elements depending on the loads they are subjected and its importance. Keywords: execution classes, consequences classes, SR EN 1090 Requirements, service category.

 

 Robotic Friction Stir Welding – a challenge for the fabrication of aluminium structures for the transportation sector

Dorin Dehelean, Asociaţia de Sudură din România, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Abstract: The paper presents the main characteristics of the Friction stir welding process and its applications in the transportation sector. The difficulties for the implementation of robotic Friction stir welding are identified. A new robotic welding system developed by a multidisciplinary research team in the frame of an European project is presented. The system is capable of performing welded joints of aluminium alloys having 3 D complex configurations. Keywords: friction stir welding, robotic welding, aluminium alloys.

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