scholarly journals The influence of welding heat input on the quality and properties of high strength low-alloy dissimilar steel butt joints

2020 ◽  
Vol 92 (2) ◽  
pp. 15-23
Author(s):  
Jacek Tomków ◽  
Jacek Haras
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
High Strength ◽  
Bending Test ◽  
Carbon Equivalent ◽  
Butt Joints ◽  
Dissimilar Steel ◽  
Static Tensile ◽  
Steel Joints ◽  
Non Destructive

The paper presents the results of non-destructive and destructive tests od dissimilar high-strength low-alloy S460ML and S460N butt joints. These steels are characterized by similar mechanical properties, but their carbon equivalent CeIIW is much different. The joints were made using different values of heat input for each welding bead. They were tested by non-destructive methods: visual, penetrant, radiographic and ultrasonic tests. Then, the destructive tests were made: static tensile test, bending test, impact test and Vickers HV10 hardness measurements. The results of prepared examinations showed, that welding with higher heat input has significant impact on the mechanical properties of the dissimilar steel joints – the joint welded with bigger heat input was characterized by better mechanical properties.

Crystal Phase Formation and Mechanical Properties of Lithium Disilicate Glass-Ceramics for Dental Restoration

2010 ◽  
Vol 177 ◽  
pp. 447-450 ◽  
Author(s):  
Xin Zhang ◽  
Yi Wen Hu ◽  
Yin Wu ◽  
Wen Jie Si
Keyword(s):  
Mechanical Properties ◽  
Phase Formation ◽  
Glass Ceramics ◽  
High Strength ◽  
Lithium Disilicate ◽  
Sem Analysis ◽  
Dental Restoration ◽  
Bending Test ◽  
Crystal Phase ◽  
High Temperature Xrd

The purpose of this study was to evaluate the crystal phase formation behavior and its influence on the mechanical properties of LiO2-SiO2-P2O5 glass-ceramics system. High temperature XRD was used to analyze the crystal phase formation in situ. The crystalline phases in the material both before and after heat-treatment were also analyzed. The flexural strength was measured by three-point bending test according to ISO 6872:2008(E). The SEM analysis showed that the high strength of the glass-ceramics is attributed to the continuous interlocking microstructure with fine lithium disilicate crystallines.

Microstructures and mechanical properties of flash butt welded high strength steel joints

2016 ◽  
Vol 96 ◽  
pp. 506-514 ◽  
Author(s):  
Chenyao Xi ◽  
Daqian Sun ◽  
Zhaozhi Xuan ◽  
Jiegong Wang ◽  
Guoshan Song
Keyword(s):  
Mechanical Properties ◽  
High Strength Steel ◽  
High Strength ◽  
Microstructures And Mechanical Properties ◽  
Steel Joints

High-Strength Steels Produced by Advanced Metallurgical Processes

1988 ◽  
Vol 4 (03) ◽  
pp. 169-185
Author(s):  
I. L. Stern ◽  
M. Wheatcroft ◽  
D. Y. Ku ◽  
R. F. Waite ◽  
W. Hanzalek
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
High Strength Steels ◽  
High Strength ◽  
Marine Industry ◽  
Metallurgical Processes ◽  
Strength And Toughness

Advanced metallurgical processes have made possible the manufacture of steels that—in addition to possessing high strength and toughness characteristics—maintain modest carbon equivalents for good weldabiiity results. These steels show promise of application in the marine industry because of their potential relative insensitivity to heat input and hardening and their potential for reduced requirements for preheat. This paper reviews several candidate steels, their composition, metallurgy and mechanical properties, and analyzes the results of a series of weldabiiity and toughness tests.

Aging Treatment on the Microstructures and Mechanical Properties of New Groove T92/Super 304H Dissimilar Steel Joints

2015 ◽  
Vol 34 (5) ◽  
Author(s):  
Jianguo Deng ◽  
Zhiyuan Liang ◽  
Shi’en Hui ◽  
Qinxin Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Heat Affected Zone ◽  
Weld Seam ◽  
Aging Treatment ◽  
Coarse Grained ◽  
Dissimilar Steel ◽  
Weld Joints ◽  
Microstructures And Mechanical Properties ◽  
Steel Joints

AbstractThe effect of aging treatment on the microstructures and mechanical properties of new groove T92/Super 304H dissimilar steel joints is studied in this paper. The experimental results show that the heat-affected zone (HAZ) of T92 is mainly composed of coarse-grained and fine-grained martensitic, whereas the microstructure of Super 304H HAZ and weld seam exhibit an austenitic structure. Aging treatment increases the nucleation and growth of second phase particles of the weld joints, especially at T92 side. The weld joints have a low tensile strength (<700 Mpa) and a high tensile strength (>700 Mpa) when the tensile fractures are located at weld seam and T92 base metal, respectively. With increasing aging time, the hardness and tensile strength of the weld joints initially decrease, then increase, and finally stabilize. Moreover, the weld joints have a maximum hardness value at the T92 heat-affected zone. At room temperature condition, the impact absorbed energy reaches the minimum value, which is related to the coarse grain containing equiaxed dendrites in the weld seam.

Microstructure and Mechanical Properties of Aluminum/Stainless Steel Joints Welded by Different Weld Heat Input

2011 ◽  
Vol 189-193 ◽  
pp. 3253-3256
Author(s):  
Hong Tao Zhang ◽  
Jia Kun Liu ◽  
Hong Yun Zhao
Keyword(s):  
Mechanical Properties ◽  
Heat Input ◽  
Filler Metal ◽  
Dissimilar Metals ◽  
Coated Steel ◽  
Microstructure And Mechanical Properties ◽  
Zinc Coated Steel ◽  
Interfacial Intermetallic Compound ◽  
Steel Joints ◽  
Aluminum Base

Dissimilar metals joints between aluminum and zinc-coated steel were joined by CMT machine with ER4043 filler metal. The microstructure and mechanical properties of the joints obtained with different heat input were analyzed. The results showed that the thickness of interfacial intermetallic compound was determined by the welding heat input. Tensile specimens were broken in HAZ of aluminum base metal and the tensile strength of the joint can reach 122.3MPa.

IMPACT TENSILE PROPERTIES OF YAG LASER WELDED BUTT JOINTS MADE BY DIFFERENT STEEL SHEETS FOR VEHICLES

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1712-1717
Author(s):  
Y. TAKAHASHI ◽  
M. DAIMARUYA ◽  
H. KOBAYASHI ◽  
H. TSUDA ◽  
H. FUJIKI
Keyword(s):  
Tensile Properties ◽  
Welded Joints ◽  
Testing Machine ◽  
High Strength ◽  
Tensile Tests ◽  
Butt Joints ◽  
Yag Laser ◽  
Steel Sheets ◽  
Static Tensile ◽  
The Impact

The tensile properties of YAG laser welded butt joints using different high strength steel sheets with a tensile strength of 270 MPa, 590 MPa and 980 MPa (denoted HR270, HR590 and HR980, respectively) were investigated at static and dynamic rates, together with the three kinds of laser welded joints made by the same steel sheets. The impact tensile tests were performed by using the vertical type of split Hopkinson tension bar apparatus, while the static tensile tests were carried out using a universal testing machine INSTRON5586. The impact tensile strengths were significantly increased in comparison with the static ones due to the effect of strain rate, which might be the contribution of the part of HR270 base metal. And in both of static and impact tests, the fracture strains of HR270-HR590 joint, HR270-HR980 joint and HR590-HR980 joint were about one half of the fracture strains observed in the same steel welded joints of HR270-HR270, HR270-HR270 and HR590-HR590, respectively.

scholarly journals The Assessment of Selected Properties of Welded Joints in High-Strength Steels

2020 ◽  
pp. 73-79
Author(s):  
Lechosław Tuz
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Welded Joints ◽  
Heat Input ◽  
Structural Changes ◽  
High Strength Steels ◽  
High Strength ◽  
High Quality ◽  
Treatment Processes ◽  
Welding Processes

The use of technologically advanced structural materials entails the necessity of adjusting typical welding processes to special requirements resulting from the limited weldability of certain material groups. Difficulties obtaining high-quality joints may be the consequence of deteriorated mechanical properties and structural changes in materials (beyond requirements of related standards). One of the aforementioned materials is steel characterised by a guaranteed yield point of 1300 MPa, where high strength is obtained through the addition of slight amounts of carbide-forming elements and the application of complex heat treatment processes. A heat input during welding may worsen the aforesaid properties not only in the weld but also in the adjacent material. The tests discussed in the article revealed that the crucial area was that heated below a temperature of 600°C, where the hardness of the material decreased from approximately 520 HV to 330 HV.

scholarly journals Experimental and Numerical Investigation of the Effect of Different Temperature and Deformation Speeds on Mechanical Properties and Springback behaviour in Al-Zn-Mg-Cu Alloy

Mechanika ◽  
2019 ◽  
Vol 25 (5) ◽  
pp. 406-412
Author(s):  
Suleyman Kilic
Keyword(s):  
Mechanical Properties ◽  
Rate Sensitivity ◽  
High Strength ◽  
Bending Test ◽  
Element Analysis ◽  
Cu Alloy ◽  
Modeling Process ◽  
The Finite Element Analysis ◽  
Bending Process ◽  
Loss Of Strength

Thanks to their low density and high strength, the 7XXX series aluminum alloys are widely used as a support/beam parts in the aerospace industry. This alloy is target in the lightening studies of the automotive industry and surveys for sheet metal are still in progress. It is a series of alloys that can be applied to the aging process and has the most effect on mechanical properties. As formability is quite weak, methods are investigated. In this study, tensile test, bending test and Erichsen tests are performed at different deformation rates and temperatures. As a result of the experiments, it has been seen that the formability increases at high temperature and low deformation rates. If paint baking time is long, there will be no loss of strength. Also, the bending process is modeled with the help of the finite element analysis programs and the springback estimations are examined. It is seen that the results of the modeling process are quite successful. The effect of the strain rate sensitivity is determined.

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