Optimisation of design and geometrical parameters of butt welded joints in heat resisting dissimilar steels

1988 ◽  
Vol 2 (8) ◽  
pp. 687-691
Author(s):  
M V Shakhmatov
Keyword(s):  
Welded Joints ◽  
Geometrical Parameters ◽  
Dissimilar Steels

Simulation of Structure Formation Processes of Dissimilar Steels Welded Joints Using an Intermediate Layer

2015 ◽  
Vol 788 ◽  
pp. 218-224
Author(s):  
Aelita Nikulina ◽  
Vadim Yu. Skeeba ◽  
Alexandra Chevakinskaya ◽  
Pavel Komarov
Keyword(s):  
Carbon Steel ◽  
Welded Joints ◽  
High Carbon Steel ◽  
Variable Parameter ◽  
Low Carbon Steel ◽  
Welding Process ◽  
Nickel Steel ◽  
Low Carbon ◽  
High Carbon ◽  
Dissimilar Steels

This paper shows the results of solving a 3D problem to define types of structures and tensions which can appear during the butt contact welding process of dissimilar steels through low carbon steel inserts. The finite element method to calculate welded structures was used. The thickness of inserts was the main variable parameter. According to the results of numerical simulation using inserts can increase the reliability of welded joints between pearlitic high-carbon steel and austenitic chromium-nickel steel. The best result was obtained by using an insert with a thickness less than 20 mm. Structural studies of the welded joints between high-carbon steel and chromium-nickel steel through low-carbon inserts confirm the results of mathematical modeling.

The Effect of Stand - Off Distance on the Mechanical Properties of TIG Butt Joints of 316 Stainless Steel

2020 ◽  
Vol 833 ◽  
pp. 59-65
Author(s):  
Hala M. Gnedi ◽  
Khawla T. Snoussi ◽  
Abulmaali M. Taher ◽  
Thoria G. Sharef ◽  
Yousef Arebi
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Base Metal ◽  
Welded Joints ◽  
Hardness Test ◽  
Scanning Speed ◽  
Geometrical Parameters ◽  
Worst Case ◽  
316 Stainless Steel ◽  
Hardness Values

The objective of this study is to investigate and determine the effect of the stand-off distance (distance between the welded plates) on the mechanical properties of the Tungsten Inert Gas (TIG) welded joints. Butt TIG welding was performed for 316 stainless steel (SS) by using different pre welding stand-off distances with fixing the other parameters (thickness of welded plates, voltage, current, groove shape, and scanning speed). The influence of the stand-off distance parameter was examined by using tensile test, hardness test in the three different regions (base metal, heat effected zone, and molten zone), non-destructive testing (including visual inspection, liquid pentrant and X – ray) and microscopic examinations. Results show that the stand-off distance is one of the most important geometrical parameters of the Butt welded joints to end by good mechanical properties. It is found that the optimum stand-off distance was about 1 mm (shows the highest hardness results), but still there were some defects in some spots in the molten metal zone which caused a decrease in the hardness values in these locations. The 2 mm stand-off distance shows reasonable results, and the worst case was recorded for the 0 mm stand-off distance condition. Generally the hardness values of the heat affected zone in all conditions were the highest when compared to both metal welding zone and the base metal zone.

scholarly journals Thermal treatment of dissimilar steels' welded joints

2016 ◽  
Vol 124 ◽  
pp. 012131
Author(s):  
A A Nikulina ◽  
A S Denisova ◽  
I N Gradusov ◽  
P A Ryabinkina ◽  
M V Rushkovets
Keyword(s):  
Thermal Treatment ◽  
Welded Joints ◽  
Dissimilar Steels

Development of failure in welded joints in dissimilar steels in transverse shear

1987 ◽  
Vol 1 (11) ◽  
pp. 1006-1009
Author(s):  
V F Luk'yanov ◽  
V V Naprasnikov ◽  
V P Golovin ◽  
E I Kolokolov
Keyword(s):  
Transverse Shear ◽  
Welded Joints ◽  
Dissimilar Steels

Formation of a Transition Zone Structure in Welded Joints between Dissimilar Steels

2014 ◽  
Vol 698 ◽  
pp. 283-287 ◽  
Author(s):  
Aelita Nikulina ◽  
Aleksandr Smirnov ◽  
Alexandra Chevakinskaya
Keyword(s):  
Carbon Steel ◽  
Transition Zone ◽  
Welded Joints ◽  
High Carbon Steel ◽  
Nickel Steel ◽  
Orientation Relationships ◽  
High Carbon ◽  
Mechanical Mixing ◽  
Zone Structure ◽  
Dissimilar Steels

The results of structural research of welded joints between pearlitic high-carbon steel and austenitic chrome-nickel steel obtained by contact welding are presented. As a result of the diffusion process and mechanical mixing of steels local alloyed areas surrounded by pearlitic colonies of high-carbon steel are formed in the transition zone of the weld. The transmission electron microscopy (TEM) has been employed. The formation of the austenitic-martensitic microstructure occurs due to reducing the amount of alloying elements in local areas as compared to the original austenitic chrome-nickel steel chemical composition. Both austenite and martensite have crystallographic characteristics with the following orientation relationships: [211] γ-Fe || [011] α-Fe; [11-1] γ-Fe || [-110] α-Fe. The presence of high-strength local regions in the transition area may lead to a significant reduction in сrack resistance of dissimilar steels welded joints.

Impact of Weld Locations of TWBs of Different Thickness Ratios on Dissimilar Steels on its Bulging Formability

2017 ◽  
Vol 744 ◽  
pp. 233-238
Author(s):  
Jiang Min Xu ◽  
Chuan Lin Hu
Keyword(s):  
Laser Welding ◽  
Heat Affected Zone ◽  
Welded Joints ◽  
Weld Seam ◽  
Asymmetric Distribution ◽  
Parent Metal ◽  
Dissimilar Steels ◽  
The Impact ◽  
Different Thickness ◽  
Hemispherical Punch

This study aimed to analyze the impact of the weld location of TWBs of different thickness ratios on dissimilar steels, particularly on its height, which is known as the rigid hemispherical punch bulging formability. Laser welding was conducted on St12 (0.8 mm) and St16 (1.2 mm) samples using three different width ratios (1:2, 1:1, and 2:1). Then, the microstructure and microhardness of the TWBs and welded joints were tested. Finally, a rigid hemispherical punch bulging formability test was conducted to obtain the bulging formability of the TWBs for the study. Further, the results were compared to the bulging formability of the parent metal. The results show that the microstructure of welds contain all types of ferrites, bainites and lath martensites. The hardness on both sides of the weld is different, and it appears to be an asymmetric distribution. The hardness of the weld seam and heat-affected zone is much higher than the parent metal. The limit dome of the TWBs is lower for each side of the parent metal. When the weld location is parallel to the direction of the principal strain, the bulging formability of TWBs of different thickness ratios is much better. Under certain combinations of material and thickness, the thicker the plate is, the better the bulging formability of the different thickness TWBs is.

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