Gas metal arc welding

Adonyi, Y.; Nadzam, J.

doi:10.1201/9781439823729.ch1

Cited by 2 publications

(2 citation statements)

References 3 publications

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“…Four different types of specimens are tested: unnotched specimens made of base and heataffected-zone material, the latter produced by a Gleeble welding simulator (see [15] for details of the machine), notched specimens of base material and welded specimens. Base material and Gleeble specimens are tested at different temperatures between ambient temperature and 350°C.…”

Section: Material Specimens and Testingmentioning

confidence: 99%

Fatigue Lives of Power Plant Structures Due to Load Sequence Effects Originating from Fluctuating Production of Renewable Energy

et al. 2018

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Abstract. The change in operation of power plants due to the increasing use of renewable energies causes additional stresses to the components by a high number of smaller load cycles. This fact results in a demand for validated new approaches to estimate fatigue life especially for welded joints that are the weak parts within the piping. The components are operated in the LCF regime where short fatigue crack growth determines the life. Therefore, a non-linear fracture mechanics based approach is appropriate. For the development and validation of the model, an experimental campaign was performed including fatigue tests of smooth specimens with various microstructures of X6CrNiNb18-10 (AISI 347) as well as specimens containing mechanical and microstructural notches. Experiments are performed with all types of specimens with an increasing complexity from constant to variable amplitude loading, the latter also applied as pseudorandom sequence derived from measurements in power plants. The developed non-linear fracture mechanics based model uses the effective cyclic J-Integral normalized to the crack length to replace crack growth calculation by a linear damage accumulation. To consider the loading history an algorithm for the calculation of crack opening and crack closure is used. The advantages of this approach are evident when comparing calculated with experimentally determined fatigue lives. Remaining differences serve for further considerations of how to improve the life prediction for variable amplitudes.

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Section: Material Specimens and Testingmentioning

confidence: 99%

Fatigue Lives of Power Plant Structures Due to Load Sequence Effects Originating from Fluctuating Production of Renewable Energy

et al. 2018

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“…Using of current pulse power supplies with programmable control significantly expands the possibilities of regulation of electrode metal transfer, in particular, pulse-spray transfer with controlled surface tension of molten metal. The main methods of control of characteristics of regulated transfer are based on a force balance, determining droplet detachment from electrode wire [5].…”

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confidence: 99%

Physical-metallurgical and welding-technological properties of gas-shielded flux-cored wires for welding of structural steels

Shlepakov¹

2014

The Paton Welding J.

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Peculiarities of process of gas-shielded arc welding using flux-cored wire are considered. Given are the data on metallurgical characteristics and classification of the gas-shielded flux-cored wires with different core types as well as examples of their successful application in industry. 6 Ref., 1 Long-term application of solid flux-cored wires in mechanized and automatic gas-shielded welding was mainly caused by their availability and small price. Eventually, understanding of technological and economic advantages of application of the flux-cored wires was verified by the results of analysis of expenses for welding performance and quality of welded joints. This allows the flux-cored wire taking the leading position in performance of welding operations in different branches of industry and building in countries with high level of economic development [1]. Gas-arc welding using the flux-cored wire allows responsing the demands of manufacturers of welding structures, since it differs by versatile, good operation characteristics and high efficiency, that provides for significant reduction of economic expenses.Today a variety of types of the flux-cored wires are classified on international standards ISO in accordance with class of steel, for which they are designed. Standard ISO 17632 [2] is used for the most widespread classes of normal strength structural steels, and ISO 18276 [3] is applied for high strength ones. Shielding gases for performance of gas-arc welding are classified on standard ISO 14175 [4]. The classification in accordance with indicated standards is further used.The specialists in area of fusion arc welding know well that change of solid wire to flux-cored one does not require variation of basic technology or application of another equipment. Current welding equipment provide for a wide range of regulation of statistical and dynamic characteristics of power sources with the help of microprocessor technology, that allows setting of the optimum welding parameters for each wire type. Feed mechanisms of the semi-automatic machines are as a rule equipped with two pairs of rolls for reduction of wire pressure, prevention of its deformation or break of geometry, that deteriorate wire feeding through the hoses.Metallurgical characteristics of gas-shielded flux-cored wires. Established classification of the flux-cored wires on type of flux core, which is included into international standards, divide them on three main types, namely rutile, basic and metallic.Rutile type (on title of mineral -rutile) includes the wires with basis of a slag system composed of titanium oxides in combination with other oxides (for example, silicates and alumosilicates), formed in melting of low-basicity slags. Change of composition and application of fluxing agents reveal wide capabilities for regulation of technological properties of these wires. They are divided on rutile ones with slowly setting and rapidly setting slag according to the welding technological properties, that determines a possibility of their application for...

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Gas metal arc welding

Cited by 2 publications

References 3 publications

Fatigue Lives of Power Plant Structures Due to Load Sequence Effects Originating from Fluctuating Production of Renewable Energy

Fatigue Lives of Power Plant Structures Due to Load Sequence Effects Originating from Fluctuating Production of Renewable Energy

Physical-metallurgical and welding-technological properties of gas-shielded flux-cored wires for welding of structural steels

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