Process parameter influence on performance of friction taper stud welds in AISI 4140 steel

Hattingh, D.G.; Bulbring, D.L.H.; Botes, Annelize; James, M.N.

doi:10.1016/j.matdes.2011.02.001

Cited by 47 publications

(21 citation statements)

References 3 publications

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“…Normally, conventional arc welding processes are employed in cases where structure repairs are needed. The concept of filling weld repair of localized damage process which allow fast, efficient and cost-effective led to the design of Friction Hydro Pillar Processing (FHPP) 6,[8][9][10] macrostructure and mechanical properties in AISI 4140 steel. It also presents 3D residual stress data for a typical friction taper stud weld.…”

Section: Introductionmentioning

confidence: 99%

“…Hence, the result of having minor microestructural modifications in base materials is the possibility of using this welding process in situ, i.e., without the necessity of any requirement of plant shutdown in order to repair a single or group of components. Consequently, FHPP welds may offer considerable time, energy and cost savings over fusion welding in repairs applications 10 macrostructure and mechanical properties in AISI 4140 steel. It also presents 3D residual stress data for a typical friction taper stud weld.…”

Section: Introductionmentioning

confidence: 99%

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Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

et al. 2016

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The Friction Hydro-Pillar Process (FHPP) is an innovative process that has been recently studied regarding its possible in situ repair applications. There is still no literature about usage of the FHPP on duplex stainless steel (DSS) base materials to smaller forces than 25 kN. The investigation on DSS processing is crucial due his wide variety of critical uses in pipes and storage structures applied in chemical industry plants, where usual welding processes may lead to safety concerns. The aim of this study is to qualify the processing of SAF 2205 (UNS 31803) duplex stainless steel welded joints using FHPP as feasible repair procedure. For this, the studied samples were welded applying a range of axial forces. The welded joints were characterized by, α/γ phase ratio, intermetallic quantification, austenite spacing measurement, microhardness profile and microstructural qualitative studies. The results showed the efficiency in repair of the FHPP process on the production of DSS joints according with the material recommendations from the standard DNV-RP-F112.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

et al. 2016

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“…For each rod applied a new cavity is machined (Figure 1b) [3]. In the world, few institutions have explored this technique [4][5][6][7][8][9][10]. The Physical Metallurgy Laboratory (LAMEF) from the Federal University of Rio Grande do Sul (UFRGS) started in 2007 studies in friction welding and has since conducted several studies on the subject.…”

Section: Introductionmentioning

confidence: 99%

Friction Hydro Pillar Processing: Characteristics and Applications

Buzzatti

Santos

et al. 2015

Soldag. insp.

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Abstract:The friction welding process is shown as an effective alternative compared to the conventional methods of joining materials, in particular Friction Hydro Pillar Processing (FHPP). With the use of automated equipment joints are produced with reliable quality and repeatability, making it possible to follow in real time the welding process. The study of the application of this process in different materials proves its use in production systems. The development of several lines of research shows that even varying materials and geometry of joints with at least 20 mm deep in thick plates, the processing time remains less than 6 (six) minutes. Furthermore, as a result joints with suitable metal/mechanical properties are made with low production cost and high productivity, even for materials with low weldability and with different characteristics. In this work will be presented various materials joined by FHPP, as well as its advantages and applicability.

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“…When using this last possibility the process may be called Friction Taper Stud Welding (FTSW). 4) FHPP is an innovative solid state technique capable of joining dissimilar materials with applications in the transportation, energy and offshore industries. It can be automated and distance operated ensuring greater reproducibility and reliability for in-situ repairs.…”

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confidence: 99%

Evaluation of Discontinuities in A36 Steel Repairs with Friction Hydro Pillar Processing Using Different Axial Forces

et al. 2013

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Friction welding techniques are widely used in several industrial sectors. A non-destructive inspection is mandatory in postprocessing for repair quality evaluation. The present study examines through conventional ultrasonic technique Friction Hydro Pillar Processing (FHPP) repairs on ASTM A36 low carbon steel plates. The repairs were made using four different axial forces, 200, 250, 300 and 350 kN with constant rotational speed of 1 000 rpm. The features of the echogram signals obtained made possible to identify and distinguish microcracks, lack of bound, clustered inclusions and isolated inclusions, forming three critical regions within the weld. It was seen that high processing forces increases probability to generate microcracks from discontinuities. These ultrasonic results were related and validated with micrographic analysis and it was possible to make a relationship between echograms features and micrographs to differentiate the discontinuities founded within the repairs. This information could be used as a guideline for operating procedure to locate discontinuities.

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Process parameter influence on performance of friction taper stud welds in AISI 4140 steel

Cited by 47 publications

References 3 publications

Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

Microstructural behavior of SAF 2205 Duplex Stainless Steel Welded by Friction Hydro Pillar Processing

Friction Hydro Pillar Processing: Characteristics and Applications

Evaluation of Discontinuities in A36 Steel Repairs with Friction Hydro Pillar Processing Using Different Axial Forces

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