On Mechanical Properties of Dissimilar Friction Welded Steel Bars

2005 ◽  
Vol 297-300 ◽  
pp. 2831-2836 ◽  
Author(s):  
Seon Jin Kim ◽  
Yu Sik Kong ◽  
Yeong Sik Kim ◽  
Sang Woo Kwon
Keyword(s):  
Friction Welding ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Base Metals ◽  
Visual Examination ◽  
Welded Steel ◽  
Bending Fatigue ◽  
Notched Specimens ◽  
Steel Bars ◽  
Molybdenum Steel

An experimental study of dissimilar friction welding was conducted using 15mm diameter solid bar in chrome molybdenum steel (SCM440) to carbon steel (S45C) not only to optimize the friction welding conditions, but also to investigate the fatigue performance. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Vickers hardness surveys of the bond of area and HAZ, and microstructure investigations. In this study, the specimens were tested as welded. For fatigue strength, the notched specimens for the optimal conditions were rotary bending fatigue tested. The results were compared with S-N curves for the base metals.

EVALUATION OF THE JOINT-INTERFACE PROPERTIES OF SCM440-S45C STEELS JOINED BY FRICTION WELDING

2010 ◽  
Vol 24 (15n16) ◽  
pp. 2621-2626
Author(s):  
SEON-JIN KIM ◽  
YU-SIK KONG ◽  
HAN-KI YOON ◽  
WON-TAEK JUNG ◽  
SUNG-WOONG CHOI
Keyword(s):  
Friction Welding ◽  
Tensile Tests ◽  
Dissimilar Welding ◽  
Welding Parameters ◽  
Joint Interface ◽  
Interface Properties ◽  
Visual Examination ◽  
Dissimilar Joints ◽  
Molybdenum Steel ◽  
Set Up

The purpose of this study is to investigate experimentally the hardness distributions and micro-structural properties of the dissimilar joints using chrome molybdenum steel (SCM440) to carbon steel (S45C) parts. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up, constructed as a continuous-drive brake type. The pilot dissimilar welding experiments under different friction pressure and friction time were carried out to obtain optimum welding parameters using visual examination and tensile tests. Vicker's hardness distributions and microstructures in the interfaces of the dissimilar joints for PWHT were also obtained and examined. The obtained results were compared with those of the previous study.

Optimization of Dissimilar Friction Welding and Creep Rupture Tests for Nuclear Reactor Component Materials

2006 ◽  
Vol 306-308 ◽  
pp. 1019-1024 ◽  
Author(s):  
Yu Sik Kong ◽  
Sang Woo Kwon ◽  
Seon Jin Kim
Keyword(s):  
Stainless Steel ◽  
Friction Welding ◽  
Copper Alloy ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Heating Time ◽  
Creep Rupture ◽  
Welding Parameters ◽  
Parameter Method ◽  
Steel Bars

An experimental work of dissimilar friction welding was conducted using 15 mm diameter solid bar in copper alloy (Cu-1Cr-0.5Zr) to stainless steel (STS316L) for being used as fusion reactor component materials, not only to optimize the friction welding parameters, but also to investigate the elevated temperature tensile strength and creep rupture properties for the friction welded joints under the optimal welding conditions. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Vickers hardness survey of the bond area and HAZ. For friction weld joining of copper alloy to stainless steel bars, the total upset increases lineally as increasing heating time. Optimal welding conditions were selected as follows: Rotational speed 2000rpm, friction pressure 80MPa, upsetting pressure 140MPa, heating time 2 second, upsetting time 5 second and total upset 13mm. The weld interface of dissimilar friction welded steel bars was mixed strongly. And also the creep properties and creep life prediction by Larson-Miller parameter method were presented at the elevated temperatures of 300, 400 and 500oC.

Influence of Rotary Friction Welding Parameters on Tensile Strength and Length of TMAZ of Dissimilar Welded Joints from 32G2 and 40KhN Steels

2021 ◽  
Vol 410 ◽  
pp. 299-305
Author(s):  
Artem S. Atamashkin ◽  
Elena Y. Priymak ◽  
Elena A. Kuzmina
Keyword(s):  
Tensile Strength ◽  
Base Metal ◽  
Process Parameters ◽  
Welded Joints ◽  
Friction Welding ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Rotary Friction Welding ◽  
Study Results ◽  
Friction Pressure

In this work, pipe billets with a diameter of 73 mm and a wall thickness of 9 mm from steels 32G2 and 40KhN are friction welded with an aim to optimize the process parameters. The friction pressure, the forging pressure and the length of the fusion varied. After the implementation of various welding modes, tensile tests and metallographic studies were carried out. The optimal welding parameters have been established, which make it possible to obtain tensile strength at the level of the 32G2 base metal. The study results of the microstructure and SEM fractographs after the optimal welding mode are presented.

scholarly journals Influence of Friction Pressure at a Given Burn-off Length on the Mechanical and Microstructural Properties of Welded Joints from Medium-Carbon Alloyed Steels in Rotaty Friction Welding

2018 ◽  
Vol 7 (4.36) ◽  
pp. 978
Author(s):  
Elena Priymak ◽  
Nadezhda Firsova ◽  
Elena Bashirova ◽  
Svetlana Sergienko ◽  
Elena Kuzmina ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Welded Joints ◽  
Friction Welding ◽  
Thermal Deformation ◽  
Tensile Tests ◽  
Welding Parameters ◽  
Microstructural Properties ◽  
Medium Carbon ◽  
Friction Pressure ◽  
Mechanical And Microstructural Properties

This study investigates the influence of friction pressure at a given  burn-off length on the microhardness, tensile properties and microstructure of the welded joints from steel 32-2-Mn and 40-Cr-Ni. Phase transformations occurring in the materials to be welded as a result of thermal deformation effects are analyzed. The change in the length of the thermomechanical affected zone (TMAZ) depending on the friction pressure is shown. The results of the distribution of microhardness in the weld, clearly illustrating the formation of hardened and weakened areas. The results of tensile tests of welded joints are given. Analyzed the place of fracture at various welding parameters. The necessity of studying the distribution of internal residual stresses to explain the mechanism of fracture of welded joints is shown.  

Prevention of Fracture of Cracked Steel Bars Using Laser: Part II—Laser Welding

1986 ◽  
Vol 108 (1) ◽  
pp. 63-67
Author(s):  
Akira Kato
Keyword(s):  
Laser Welding ◽  
Co2 Laser ◽  
Fracture Prevention ◽  
Tensile Tests ◽  
Bending Fatigue ◽  
Laser Part ◽  
Steel Bars ◽  
Static Tensile

This paper investigates the effect of laser welding on the prevention of fracture of cracked steel specimens. Precracks occurred in shaft specimens of SAE 1015 were welded by a CO2 laser, and then the rotary bending fatigue and static tensile tests were executed. Both strengths of fatigue and tensile of specimens having a diameter 11mm with a fairly large precrack 13mm long could be raised up to that of virgin specimens. It was shown that laser welding is very effective for the fracture prevention of cracked steel shafts.

scholarly journals The Performance of CR180IF and DP600 Laser Welded Steel Sheets under Different Strain Rates

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1553
Author(s):  
Mária Mihaliková ◽  
Kristína Zgodavová ◽  
Peter Bober ◽  
Anna Špegárová
Keyword(s):  
Sheet Steel ◽  
Testing Machine ◽  
Dynamic Test ◽  
Tensile Tests ◽  
Joint Surface ◽  
Strain Rates ◽  
Interstitial Free ◽  
Welded Steel ◽  
Steel Sheets ◽  
Static Tensile

The presented research background is a car body manufacturer’s request to test the car body’s components welded from dissimilar steel sheets. In view of the vehicle crew’s protection, it is necessary to study the static and dynamic behavior of welded steels. Therefore, the influence of laser welding on the mechanical and dynamical properties, microstructure, microhardness, and welded joint surface roughness of interstitial free CR180IF and dual-phase DP600 steels were investigated. Static tensile tests were carried out by using testing machine Zwick 1387, and dynamic test used rotary hammer machine RSO. Sheet steel was tested at different strain rates ranging from 10−3 to 103 s−1. The laser welds’ microstructure and microhardness were evaluated in the base metal, heat-affected zone, and fusion zone. The comprehensive analysis also included chemical analysis, fracture surface analysis, and roughness measurement. The research results showed that the strain rate had an influence on the mechanical properties of base materials and welded joints. The dynamic loading increases the yield stress more than the ultimate tensile strength for the monitored steels, while the most significant increase was recorded for the welded material.

A Study on the Coupled Thermal and Damage Effects in Deforming Solids

2011 ◽  
Vol 312-315 ◽  
pp. 229-234
Author(s):  
M. Vaz ◽  
Pablo A. Muñoz-Rojas ◽  
M.R. Lange
Keyword(s):  
Metal Forming ◽  
Ductile Failure ◽  
Tensile Tests ◽  
Thermal Softening ◽  
Mechanical Degradation ◽  
Material Behaviour ◽  
Temperature Variations ◽  
Damage Models ◽  
Notched Specimens ◽  
Fully Coupled

Mechanical degradation and ductile failure in metal forming operations can be successfully modelled using fully coupled damage models. In addition, it has been largely reported in the literature that temperature variations affect material behaviour, especially thermal softening. This paper presents a numerical discussion of the coupled effects between ductile damage and temperature evolution based on the simulation of tensile tests of notched specimens.

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