Friction Hydro Pillar Processing: Characteristics and Applications

Buzzatti, Diogo Trento; Buzzatti, Jonas Trento; Santos, Rafael; Mattei, Fabiano; Chludzinski, Mariane; Strohaecker, Telmo Roberto

doi:10.1590/0104-9224/si2003.04

Cited by 5 publications

(3 citation statements)

References 4 publications

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“…The axial forces required for FHPP are lower than those required for FSW and no lateral forces are required. To weld AISI4140 steel, for example, a downward pushing force of 10.5 kN and a rotational speed of 6,000 rpm are required ( Kanan et al, 2018 ; Buzzatti et al, 2015 ).…”

Section: Manipulation and Maintenance Methodsmentioning

confidence: 99%

Inspection and maintenance of industrial infrastructure with autonomous underwater robots

Nauert,

Kampmann

2023

Front. Robot. AI

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Underwater infrastructure, such as pipelines, requires regular inspection and maintenance including cleaning, welding of defects and valve-turning or hot-stabbing. At the moment, these tasks are mostly performed by divers and Remotely Operated Vehicles (ROVs) but the use of intervention Autonomous Underwater Vehicles (intervention-AUVs) can greatly reduce operation time, risk, and cost. However, autonomous underwater manipulation has not yet reached a high technological readiness and is an intensively researched topic. This review identifies key requirements based on necessary inspection and maintenance methods, linking them to the current technology and deriving major challenges which need to be addressed in development. These include the handling of tools, where a separation between handheld and mounted tools is detected in already employed underwater intervention vehicles such as the Sabertooth by Saab Seaeye or the Aquanaut by Nauticus robotics, two vehicles capable of semi-autonomous intervention. The main challenge identified concerns high level autonomy, i.e., the process of decision-making. This process includes detecting the correct point of interest, maximizing the workspace of the manipulator, planning the manipulation considering required forces, and monitoring the progress to allow for corrections and high quality results. In order to overcome these issues, reliable close range sensing and precise end point navigation is needed. By identifying these persisting challenges, the paper provides inspiration for further development directions in the field of autonomous underwater intervention.

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Section: Manipulation and Maintenance Methodsmentioning

confidence: 99%

Inspection and maintenance of industrial infrastructure with autonomous underwater robots

Nauert,

Kampmann

2023

Front. Robot. AI

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“…As these are automatized processes, repeatability and reproducibility are guaranteed; in addition, the low emission of gases and radiation characterizes them as eco-friendly processes [3,5]. In addition, the low temperature involved allows the welding of similar and dissimilar materials, avoiding melting defects [3,[6][7][8]. As presented by Vyas et al [9], the solid-state process generated reliable Al-steel joints.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

dos Santos,

Chludzinski,

Nunes

et al. 2023

JMMP

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Repairing links of offshore mooring chains has presented a significant industry challenge, primarily arising from modifications in material properties, encompassing alterations in microstructure, hardness, and residual stress. In this context, the present work investigates the method of friction hydro-pillar processing (FHPP) applied to R4 grade mooring chain steel. Joints in as-repaired and post-weld heat treatment (PWHT) conditions were subjected to residual stress (RS) tests using the neutron diffraction technique, microhardness mapping, and microstructural evaluations. The process generated peaks of tensile and compressive stresses in different directions and hardness below that of the parent material in the softening zone. The friction zone promoted high hardness levels in the thermo-mechanically affected zone (TMAZ) with a maximum of 19% of the ultimate tensile strength of the parent material. As expected, the PWHT restored the RS and reduced the hardness; however, 4 h PWHT allowed the elimination of a hardness higher than that of the base material.

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“…Since no fusion is involved in the process, typical solidification-related problems are avoided, thus offering a convenient and economical way of repairing damaged components. Furthermore, the process is fast and can be completely automated [7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the residual stress distribution in repairs in H13 steel by friction hydro pillar processing

Amavisca

Fonseca

Diehl

et al. 2020

Science and Technology of Welding and Joining

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The distribution of residual stresses (RS) in repairs generated by Friction Hydro-Pillar Processing (FHPP) in AISI H13 was investigated. Three axial force levels, with consequent different deposition rates, were applied to replicate possible repaired conditions. The contour (CM) and X-ray diffraction (XRD) methods were employed for RS analysis in samples that were also evaluated through metallography, microhardness analysis, micro-tensile and Charpy testing. CM produced 2D maps of the RS in the joints, showing symmetrical distributions around the welded rod for all welded conditions. Other common features for all conditions were the maximum level of compressive RS, which was found in the TMAZ of the rod, and the maximum tensile residual stress, which was found near the HAZ of the base block. There was good agreement between the RS measurement techniques. Mechanical tests show similar tensile resistance for all conditions and an apparent increase in toughness at higher force levels.

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Friction Hydro Pillar Processing: Characteristics and Applications

Cited by 5 publications

References 4 publications

Inspection and maintenance of industrial infrastructure with autonomous underwater robots

Inspection and maintenance of industrial infrastructure with autonomous underwater robots

Investigation of Friction Hydro-Pillar Processing as a Repair Technique for Offshore Mooring Chain Links

Investigation of the residual stress distribution in repairs in H13 steel by friction hydro pillar processing

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