scholarly journals Mechanical Properties of Laser Welded SS316 and SS321

2020 ◽  
Vol 9 (6) ◽  
pp. 192-195
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Welded Joints ◽  
Flexural Rigidity ◽  
Laser Beam Welding ◽  
Energy Concentration ◽  
Maximum Temperature ◽  
Steel Grades ◽  
Three Point Bend Test ◽  
Point Bend

Stainless steel is used in a plenitude of domains from low end applications, like surgical products to high-end applications like aerospace sector. Stainless steels are iron-carbon based alloys with more than 10.5% chromium. The chromium present in stainless steel has greater affinity towards oxygen atom and will result in the formation of chromium oxide film over the surface at molecular level. Stainless steel grades SS321 and SS316 are considered in this work due to its better flexural rigidity, corrosion resistance and maximum temperature withstanding capacity. The laser beam welding was preferred due to high local energy concentration of the laser beam, which makes it more suitable method for stainless steel welding. Chromium precipitation on the grain boundaries is avoided by using a high laser welding speed that diminishes the exposure of the weld to high temperatures. The microstructure of the welded joints are examined using metallurgical microscope to find out the flaws over the weld joint. Three-point bend test was conducted to quantify the mechanical strength of the welded joints.

scholarly journals Influence of Parameters of Laser Beam Welding on Structure of 2205 Duplex Stainless Steel

2019 ◽  
Vol 19 (1) ◽  
pp. 21-31 ◽  
Author(s):  
M. Landowski
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Duplex Stainless Steel ◽  
Welded Joints ◽  
Laser Beam Welding ◽  
Welding Parameters ◽  
Processing Technologies ◽  
High Level ◽  
The Impact

AbstractLaser welding is used in modern industry, having many advantages comparing to traditional welding technologies. Nowadays, industry sectors such as shipbuilding, automotive and aviation can’t be imagined without laser processing technologies. Possibility of increase of welded joint properties, autogenous welding and high level of process automation makes the technology of laser welding perspective part of the industry. Physical multidimensional processes complexity requires a deeper understanding of the impact of laser welding parameters on the quality of welded joints for industrial implementation. The paper presents results of microstructure investigations of laser beam welded stainless steel under various welding parameters. Welded joints was achieved by Ytterbium fiber laser type without the use of the filler material. Material for test was 2205 ferritic-austenitic duplex stainless steel (DSS) plates with thickness of 8 mm in delivery condition. The objectives of this research was to investigate influence of laser welding parameters on weld geometry of butt-welded joints. Investigations of bead shape revealed correlation between laser beam focus position and weld penetration depth.

Characterization of Dissimilar Welded Joints Between Austenitic and Duplex Stainless Steel Grades for Liquid Tank Applications

2018 ◽  
Author(s):  
G. Ubertalli ◽  
M. Ferraris ◽  
P. Matteis ◽  
D. Di Saverio
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Stainless Steels ◽  
Welded Joints ◽  
Industrial Applications ◽  
Duplex Stainless Steels ◽  
Steel Pipes ◽  
Steel Grades ◽  
Welding Processes

Lean duplex stainless steels have similar corrosion and better mechanical properties than the austenitic grades, which ensure their extensive spreading in industrial applications as a substitute of austenitic grades. In the construction of liquid tanks, however, it is often necessary to weld such steels with a range of fittings which are commonly fabricated with austenitic stainless steel grades. Therefore, this paper examines dissimilar welded joints between LDX 2101 (or X2CrMnNiN22-5-2) lean duplex stainless steels plates and austenitic stainless steel pipes, carried out by different arc welding processes. The investigation focuses on the correlation between the welding procedures and the microstructural and mechanical properties of the welded joints.

scholarly journals Assessment of the Effect of Laser Welding on the Properties and Structure of TMCP Steel Butt Joints

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1312 ◽  
Author(s):  
Jacek Górka
Keyword(s):  
Laser Beam ◽  
Welded Joints ◽  
Research Work ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Tensile Tests ◽  
Carbon Equivalent ◽  
Quality Level ◽  
Butt Joints ◽  
Plastic Properties

The research work and related tests aimed to identify the effect of filler metal-free laser beam welding on the structure and properties of butt joints made of steel 700MC subjected to the TMCP (thermo-mechanically controlled processed) process. The tests involved 10-mm thick welded joints and a welding linear energy of 4 kJ/mm and 5 kJ/mm. The inert gas shielded welding process was performed in the flat position (PA) and horizontal position (PC). Non-destructive testing enabled classification of the tested welded joints as representing the quality level B in accordance with the requirements set out in standard 13919-1. Destructive tests revealed that the tensile strength of the joints was 5% lower than S700MC steel. The results of tensile tests and changes in structure were referred to joints made using the MAG (Metal Active Gas) method. The tests of thin films performed using a high-resolution scanning transmission electron microscope revealed that, during laser beam welding, an increase in dilution was accompanied by an increase in the content of alloying microadditions titanium and niobium, particularly in the fusion area. A significant content of hardening phases in the welded joint during cooling led to significant precipitation hardening by fine-dispersive (Ti,Nb)(C,N) type precipitates being of several nanometres in size, which, in turn, resulted in the reduction of plastic properties. An increase in the concentration of elements responsible for steel hardening, i.e., Ti and Nb, also contributed to reducing the weld toughness below the acceptable value, which amounts to 25 J/cm2. In cases of S700MC, the analysis of the phase transformation of austenite exposed to welding thermal cycles and the value of carbon equivalent cannot be the only factors taken into consideration when assessing weldability.

Laser Welding Simulations of Stainless Steel Joints Using Finite Element Analysis

2011 ◽  
Vol 383-390 ◽  
pp. 6225-6230
Author(s):  
K.R. Balasubramanian ◽  
T. Suthakar ◽  
K. Sankaranarayanasamy ◽  
G. Buvanashekaran
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Laser Beam ◽  
Laser Welding ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Weld Bead ◽  
Heat Of Fusion ◽  
T Joints ◽  
Finite Element Software

Laser beam welding (LBW) is a fusion joining process that uses the energy from a laser beam to melt and subsequently crystallize a metal, resulting in a bond between parts. In this study, finite element method (FEM) is used for predicting the weld bead profile of laser welding butt, lap and T-joints. A three-dimensional finite element model is used to analyze the temperature distribution weld bead shape for different weld configurations produced by the laser welding process. In the model temperature-dependent thermo physical properties of AISI304 stainless steel, effect of latent heat of fusion and convective and radiative boundary conditions are incorporated. The heat input to the FEM model is assumed to be a 3D conical Gaussian heat source. The finite element software SYSWELD is employed to obtain the numerical results. The computed weld bead profiles for butt, lap and T-joints are compared with the experimental profiles and are found to be in agreement.

Laser Beam Welding of Borated Stainless Steel

2015 ◽  
Vol 775 ◽  
pp. 138-142
Author(s):  
Daniel Drimal ◽  
Frantisek Kolenic
Keyword(s):  
Stainless Steel ◽  
Laser Beam ◽  
Boron Content ◽  
Spent Nuclear Fuel ◽  
Laser Beam Welding ◽  
Production Method ◽  
Aisi 304 ◽  
Weld Joints ◽  
Steel Aisi ◽  
Borated Stainless Steel

Laser beam welding of the absorption tubes made from stainless steel with increased boron content represent suitable production method of storage for spent nuclear fuel. This contribution presents results of weld joints investigation. The experiments were performed on borated stainless steel AISI 304 B6B with boron content 1.74 % wt. Weld joints were prepared by laser beam welding using fiber laser generator and examined by optical and electron microscopy.

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