scholarly journals Effect of Periodic Water Clusters on AISI 304 Welded Surfaces

Materials ◽  
2021 ◽  
Vol 14 (1) ◽  
pp. 210
Author(s):  
Madhulika Srivastava ◽  
Akash Nag ◽  
Lucie Krejčí ◽  
Jana Petrů ◽  
Somnath Chattopadhyaya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Welded Joints ◽  
Water Clusters ◽  
Water Pressure ◽  
Water Jet ◽  
Technological Parameters ◽  
Maximum Enhancement ◽  
Aisi 304 ◽  
Pulsating Water Jet

This study compared the effect of the interaction time of periodic water clusters on the surface integrity of AISI 304 tungsten inert gas (TIG) welded joints at different excitation frequencies, as the effect of the technological parameters of pulsating water jet (PWJ) on the mechanical properties of TIG welded joints are under-researched. The TIG welded joints were subjected to different frequencies (20 and 40 kHz) and traverse speeds (1–4 mm/s) at a water pressure of 40 MPa and a standoff distance of 70 mm. The effect of the interaction of the pulsating jet on the material and the enhancement in its mechanical properties were compared through residual stress measurements, surface roughness, and sub-surface microhardness. A maximum enhancement in the residual stress values of up to 480 MPa was observed in the heat-affected zone, along with a maximum roughness of 6.03 µm and a maximum hardness of 551 HV using a frequency of 40 kHz. The improvement in the surface characteristics of the welded joints shows the potential of utilizing pulsed water jet technology with an appropriate selection of process parameters in the treatment of welded structures.

scholarly journals TECHNOLOGINIŲ PARAMETRŲ ĮTAKOS VIRINTINĖS JUNGTIES SAVYBĖMS TYRIMAI, SUVIRINANT AISI 304 PLIENĄ / RESEARCH OF THE TECHNOLOGICAL PARAMETERS INFLUENCE ON THE WELD PROPERTIES OF WELDED STEEL AISI 304

2019 ◽  
Vol 11 (0) ◽  
pp. 1-4
Author(s):  
Mantvydas Sereika ◽  
Valentinas Varnauskas ◽  
Irmantas Gedzevičius
Keyword(s):  
Finite Element ◽  
Welded Joints ◽  
Visual Inspection ◽  
Hardness Testing ◽  
Technological Parameters ◽  
Welded Steel ◽  
Aisi 304 ◽  
Aisi 304 Steel ◽  
Weld Properties ◽  
Steel Aisi

The article analyzes the influence of technological parameters on the properties of welded joints by welding AISI 304 steel. In order to get the results was carried out computer modeling with the finite element modeling program ANSYS, welded samples performed visual inspection, hardness testing to make a seam. Results of the study are presented in tabular and graphic representation, the conclusions.

scholarly journals Experimental Research and Numerical Simulation of Weld Repair with High Energy Spark Deposition Method

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 980 ◽  
Author(s):  
Yingjie Zhang ◽  
Kai Yang ◽  
Jianping Zhao
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Residual Stress ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
High Energy ◽  
Repair Welding ◽  
Repair Processes ◽  
Repair Technology ◽  
Surface Repair

For long-serviced pressure equipment that is under severe working conditions such as a high temperature, high pressure, and corrosion, the material properties and structure will be unavoidably damaged or degraded, especially cracks and other damages at key positions such as welded joints, which seriously threaten the safe operation of the equipment. In order to promote the sustainable development of industries such as the chemical and petrochemical industries, remanufacturing technology has emerged worldwide, and various surface repair processes have also rapidly developed. As an important branch of surface repair technology, the high energy spark deposition (HESD) process is a new pulse cold welding repair technology developed from electro-spark deposition, which combines the advantages of multiple surface repair processes. The HESD process has the characteristics of a smaller heat affected zone and lower welding residual stress. It is a new type of repair method that is worthy of popularization and application. The process has been initially applied in the fields of surface modification and die steel repair. In this paper, the application of the HESD process to the repair of welded joints was introduced, the mechanical properties of the joints and the residual stress distribution after welding were analyzed, and the feasibility of HESD as a repair welding method for pressure structures was discussed. First, a numerical simulation of the temperature and stress field of HESD was proposed by using ABAQUS and the related subprograms, and the validity of the simulation results was verified by the residual stress test with the indentation strain method. Due to the precise control of the heat and pulse discharge working mode, the heat-affected zone and deformation caused by the HESD were extremely small, and the residual stress that was generated was low and only concentrated on the repair welding seam. Second, according to the numerical simulation and the test results of the mechanical properties of the welded joint, the optimal repair welding process parameters were obtained through the orthogonal experiment: peak current 45 A, pulse width 90 ms, and output voltage 10 V.

Characterization of Mechanical Properties and Residual Stress in API 5L X80 Steel Welded Joints

2017 ◽  
Vol 27 (1) ◽  
pp. 124-137 ◽  
Author(s):  
Amilton de Sousa Lins ◽  
Luís Felipe Guimarães de Souza ◽  
Maria Cindra Fonseca
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Welded Joints ◽  
X80 Steel

Modification of Microstrucure and Residual Stress on Friction Welding Surface of Titanium Alloy by Water-Jet Cavitation Peening

2011 ◽  
Vol 317-319 ◽  
pp. 429-435 ◽  
Author(s):  
Dong Ying Ju ◽  
Xin Mao Fu ◽  
Shun Na ◽  
Bing Han ◽  
Xiao Hu Deng
Keyword(s):  
Electron Microscopy ◽  
Residual Stress ◽  
Welded Joints ◽  
Compressive Residual Stress ◽  
Welded Joint ◽  
Water Jet ◽  
X Ray Diffraction ◽  
X Ray ◽  
Welding Surface ◽  
Scanning Electron

Water jet cavitation peening is applied to improve the strength and mechanical properties of the friction-welded joints of titanium alloys. Scanning electron microscopy observations of the microstructure of the welded joints and welded area before/after water jet cavitation peening confirm slip dislocation at the microstructure near the surface of the specimens. The residual stress on the surface of the welded joint is measured by X-ray diffraction. The results indicate the effect of peening time on the strength of compressive residual stress.

scholarly journals Effect of Residual Stress on the Mechanical Properties of FSW Joints with SUS409L

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Yeong-Seok Lim ◽  
Sang-Hyuk Kim ◽  
Kwang-Jin Lee
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Residual Stresses ◽  
Welded Joints ◽  
Stress Measurement ◽  
Charpy Impact ◽  
Stir Zone ◽  
Hole Drilling ◽  
Friction Stir ◽  
Compressive Residual Stresses

This study was performed to investigate both the residual stress distribution and the effect of the residual stress formed at the welding region on the mechanical properties of the friction stir welded joints with 409L stainless steel sheets. Residual stress measurement with hole-drilling method; mechanical property evaluation including tensile test, Charpy impact test, and fatigue test; and microstructure observation were conducted. It has got no residual stresses to speak of at the center region of the stir zone because the stored stresses are released in the process of the dynamic recrystallization, while a small quantity of compressive residual stresses is formed at the surface region of the stir zone because of strong compression reaction by the tool shoulder. A considerable amount of compressive residual stresses is formed at the thermomechanical affected zone because of the synergy between the thermal expansion due to the heat conduction from the stir zone and mechanical compression by the tool. The formation of residual stresses shows a similar tendency between the advancing side and the retreating side. Both the mitigation of residual stress in the stir zone and the formation of compressive residual stress in the thermomechanical affected zone contribute to the improvement of the mechanical properties of the friction stir welded joints.

scholarly journals Influence of Residual Stress on Fatigue Design of AISI 304 Stainless Steel

2011 ◽  
Vol 7 (2) ◽  
pp. 44 ◽  
Author(s):  
L. Singh ◽  
R.A. Khan ◽  
M.L. Aggarwal
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Stainless Steel ◽  
Fatigue Strength ◽  
Stress Field ◽  
Shot Peening ◽  
Compressive Residual Stress ◽  
Residual Stress Field ◽  
Aisi 304 ◽  
Fatigue Design

 Austenitic stainless steel cannot be hardened by any form of heat treatment, in fact, quenching from 10000C merely softens them. They are usually cold worked to increase the hardness. Shot peening is a cold working process that changes micro-structure as well as residual stress in the surface layer. In the present work, the compressive residual stress and fatigue strength of AISI 304 austenitic stainless steel have been evaluated at various shot peening conditions. The improvement in various mechanical properties such as hardness, damping factors and fatigue strength was noticed. Compressive residual stress induced by shot peening varies with cyclic loading due to relaxation of compressive residual stress field. The consideration of relaxed compressive residual stress field instead of original compressive residual stress field provides reliable fatigue design of components. In this paper, the exact reductions in weight and control of mechanical properties due to shot peening process are discussed. 

scholarly journals An Investigation on the Effect of Axial Pressures on the Mechanical Properties of Friction Welded Dissimilar Steels

2014 ◽  
Vol 6 ◽  
pp. 639378 ◽  
Author(s):  
Amit Handa ◽  
Vikas Chawla
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Impact Strength ◽  
Welded Joints ◽  
Experimental Setup ◽  
Low Alloy Steel ◽  
Aisi 304 ◽  
Mechanical Joining

The aim of the present study was to investigate the effect of axial pressures on the mechanical properties of friction welded AISI 304 with AISI 1021 steels, produced by mechanical joining. In the present study, an experimental setup was designed in order to accomplish friction welded joints between austenitic stainless steel and low alloy steel. Samples were welded under different axial pressures, at a constant speed of 800 rpm. The tensile strength, impact strength, and microhardness values of the welded joints were determined and evaluated and on the basis of the results obtained from the experimentation, the graphs were plotted.

Surface Treatment of AISI 304 Using Pulsating Water Jet Peening

2017 ◽  
pp. 535-548 ◽  
Author(s):  
Madhulika Srivastava ◽  
Rupam Tripathi ◽  
Sergej Hloch ◽  
Ayush Rajput ◽  
Drupad Khublani ◽  
...  
Keyword(s):  
Surface Treatment ◽  
Water Jet ◽  
Aisi 304 ◽  
Pulsating Water Jet

Residual stress and surface properties of stainless steel welded joints induced by ultrasonic pulsed water jet peening

Measurement ◽  
2018 ◽  
Vol 127 ◽  
pp. 453-462 ◽  
Author(s):  
Madhulika Srivastava ◽  
Sergej Hloch ◽  
Lucie Krejci ◽  
Somnath Chattopadhyaya ◽  
Amit Rai Dixit ◽  
...  
Keyword(s):  
Residual Stress ◽  
Stainless Steel ◽  
Surface Properties ◽  
Welded Joints ◽  
Water Jet ◽  
Pulsed Water Jet
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