Friction Stir Welding of Pipeline Steels

Mahoney, Murray W.; Sanderson, S. J.; Feng, Zhili; Steel, Russell; Packer, Scott; Fleck, Dale

doi:10.1007/978-3-319-48108-1_7

Cited by 11 publications

(15 citation statements)

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“…This observation contradicted the results reported by previous researchers where they observed the material flow was in upward direction in the advancing side. 31,32 However, it has been reported by Kumar et al 24 and London et al 33 that the direction of flow of the shoulder driven material was in downward direction in the advancing side. The reason reported was the tilt angle given on the tool that increased the heat generation and caused the material stirring at the trailing edge which led to the ploughing action.…”

Section: Resultsmentioning

confidence: 96%

Effect of tool concavity on flash formation during fabrication of tubes through friction stir welding

Sen

Pal

Panda

2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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Tubular components are challenging to weld using friction stir welding (FSW) process due to its curvature. In the present work, a novel strategy involving concave shoulder tool with three different concavities (3°, 6° and 9°) coupled with double pass was devised to fabricate longitudinal FSWed tubes of AA5083-O. An increase in concavity resulted in formation of flash and thinning of weld zone (WZ) due to excessive heat generation caused by enhanced tool contact with tube curvature. The flash generation led to the formation of porosity in the WZ. The tool with 6° concavity resulted in spherical pores whereas long and needle shaped pores were witnessed in case of 9° concave tool. However, negligible pores were observed with 3° concave tool leading to excellent WZ strength. Therefore, it was inferred that concave shoulder tool with small concavity along with double pass was suitable for welding tubes using FSW.

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Section: Resultsmentioning

confidence: 96%

Effect of tool concavity on flash formation during fabrication of tubes through friction stir welding

Sen

Pal

Panda

2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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“…The retractable pin can also be used as a mechanism to avoid the inevitable defect created during the extraction of the tool at the end of the process, referred to as a keyhole, which may not be acceptable for most orbital welding applications. Nonetheless, there are other approaches to preventing the keyhole defect, such as using a run-off ramp [26], which will be better explained later in this work. Similar to the fixed probe tools, the adjustable ones also require a back anvil and allow the use of a tilt angle during the process.…”

Section: Fsw Toolsmentioning

confidence: 99%

A Review of Orbital Friction Stir Welding

Ferreira

Felice

Brito

et al. 2023

Metals

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Friction stir welding is a solid-state joining process widely used in several industrial applications. One of its variants, orbital friction stir welding, is of key importance in fundamental industries such as oil and gas and aerospace. For orbital friction stir welding, there is a need to develop not only new process parameters but also tools and ancillary mechanisms that can ensure sound, high-performing joints are obtained. This review assesses the current state of orbital friction stir welding, highlighting several key aspects related to this technology.

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“…After FSP of such alloys as well as AA7050 and the cast alloy AA356 superplastic ductilities exceeding 500 pct. at strain rates >10 -2 s -1 have been attained [17][18][19][20][21][22][23][24][25][26][27][28]. Grain sizes are typically <5 μm and thus finer than in conventionally processed material although the grain size depends strongly on FSP conditions.…”

Section: Achieving Superplasticity By Fspmentioning

confidence: 99%

Friction stir processing (FSP) and superplasticity

McNelley¹

2015

LoM

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FSP is an allied technology of friction stir welding (FSW). The development and applications of these technologies are reviewed and additional considerations such as processing pattern and step over distance between successive passes in FSP are discussed. The deformation field for a rotating and advancing tool is not symmetric about the axis of tool motion. Thus, various spiral patterns with step over distances less than the tool pin diameter result in replacement of advancing interfaces (tool tangential velocity and traversing speed add) retreating interfaces (tool tangential velocity and traversing speed subtract) and greater homogeneity of the resulting stir zone microstructures. Microstructures formed as a result FSP often exhibit refined and uniform distributions of non-deforming constituents as well as highly refined grain structures, and superplastic response following FSP of wrought 7XXX and 5XXX Al alloys has been achieved. The application of multi-pass FSP to cast metals, including continuously cast (CC) AA5083 and AA356 as well as a Na modified Al-7Si will be summarized and the conversion of as-cast microstructures to a wrought condition in the absence of external shape change will be shown. Grain refinement is the result of recrystallization during the rapid thermomechanical cycle of FSP. The mechanisms involved in homogenization of constituent particle distributions remains to be determined. The FSP-induced superplastic response of the AA5083 will be documented. In contrast, grain refinement in the Na modified Al-7Si alloy was insufficient to support superplasticity.Keywords: friction stir processing, recrystallzation, grain refinement, micrsotructure homogenization, particle refinement, microstructure stability, superplasticity Обработка трением с перемешиванием (ОТП) и сверхпластичностьОбработка трением с перемешиванием (ОТП) представляет собой технологию, родственную технологии сварки трением с перемешиванием (СТП). Дан обзор развития и применения этих технологий и обсуждены дополни-тельные вопросы, такие как схема обработки и длина шага по поверхности между последовательными проходами при ОТП. Поле деформации для вращающегося и движущегося поступательно инструмента несимметрично отно-сительно направления движения инструмента. Поэтому различные спиральные схемы обработки с длиной шага менее диаметра наконечника инструмента приводят к замене интерфейсов движущейся вперед стороны (тан-генциальная скорость инструмента и скорость поступательного движения складываются) интерфейсами движу-щейся назад стороны (тангенциальная скорость инструмента и скорость поступательного движения вычитаются) и к более высокой однородности микроструктуры зоны перемешивания. Микроструктуры, формируемые в ре-зультате ОТП, часто демонстрируют однородное распределение измельченных недеформируемых составляющих, а также сильно измельченную зеренную структуру, и после ОТП кованых алюминиевых сплавов 7XXX и 5XXX достигается сверхпластическое поведение. Обобщены данные о применении многопроходной ОТП к литым ме-таллам, включая с...

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Friction Stir Welding of Pipeline Steels

Cited by 11 publications

References 0 publications

Effect of tool concavity on flash formation during fabrication of tubes through friction stir welding

Effect of tool concavity on flash formation during fabrication of tubes through friction stir welding

A Review of Orbital Friction Stir Welding

Friction stir processing (FSP) and superplasticity

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