scholarly journals Mechanical and Metallurgical Characterisation of CO2 Laser Beam Welding AISI 4130 and AISI 310 Sheets of Steel

2021 ◽  
Vol 71 (2) ◽  
pp. 19-30
Author(s):  
Bijivemula Narayana Reddy ◽  
Pothur Hema ◽  
Chevireddy Eswara Reddy
Keyword(s):  
Laser Beam ◽  
Focal Point ◽  
Focal Length ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Processing Parameters ◽  
Fusion Welding ◽  
Work Piece ◽  
Steel Aisi ◽  
Aisi 4130

Abstract Laser Beam Welding (LBW) is the fusion welding technique in which coalescence is produced by heating the work piece by impingement of concentrated beam of laser light. In this paper a full depth butt welding of alloy steel AISI 4130 and stainless steel AISI 310 of 2 mm thickness by using CO2 Laser Beam Welding machine has been performed. Design of experiment is done by using Taguchi method L25 i.e. level 5 by considering process parameters i.e. power, welding speed, beam angle, focal point position and focal length. The experimental output results that are measured for the mechanical properties of welds (Ultimate Tensile Strength and Hardness). The analysis was carried out to explain the influence of the LBW processing parameters values on the mechanical and microstructural aspects. The weld Joint is analysed by Optical Microstructure and Scanning Electron Microscopy (SEM). The Energy Dispersive X-Ray Analysis (EDAX) was carried out to determinate the chemical composition of the weld zone.

scholarly journals An Analysis of the Mechanical and Metallurgical Behavior of AISI 4130 Steel After Co2 Laser Beam Welding Process

2020 ◽  
Vol 9 (4) ◽  
pp. 2230-2234
Keyword(s):  
Laser Beam ◽  
Weld Joint ◽  
Focal Point ◽  
Focal Length ◽  
Research Work ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Bead Width ◽  
Aisi 4130

Alloy metal has received special attention in the aerospace and defense areas. The AISI 4130 alloy steel had been also considered, since it is applied in landing gears, small aircrafts engine cradles, and besides general industries. The Laser Beam Welding of high strength metals obtained small Weld Zone and better quality with good appearance. In this research work, a Laser Beam Welding (LBW) is used to weld AISI 4130. The experiments are conducted accordingly combination of Taguchi L25 based 5 levels of Laser Power, Speed, Angle, Focal Length and Focal Point Position. The AISI 4130 weld joint Bead Width and tensile strength are measured and analysed by ANOVA. Microstructure and SEM with EDAX are using to analysis the AISI 4130 weld joint.

The Studies of Plasma Torch Processes by Laser Beam Welding

2017 ◽  
Vol 893 ◽  
pp. 190-194
Author(s):  
Igor Yu. Letyagin ◽  
Dmitriy Trushnikov ◽  
Vladimir Ya. Belenkiy
Keyword(s):  
Laser Beam ◽  
Thermal Processing ◽  
Plasma Torch ◽  
Laser Beam Welding ◽  
Melting Process ◽  
Work Piece ◽  
Testing Procedures ◽  
On Line

The manufacturing of significant products with help of laser beam welding technologies requires higher stability characteristics of such technologies; this explains the necessity to run on-line testing procedures of through pro-melting process. This type of testing can be carried out by the registration of plasma streams that occur under a work piece by through pro-melting [i.e. metal undergoes an intensive laser beam thermal processing].

Mechanical and Microstructural Characterization of 8 mm Thick Samples of SS 316L by CO2 Laser Welding

2012 ◽  
Vol 585 ◽  
pp. 430-434 ◽  
Author(s):  
B. Ramesh Kumar ◽  
N. Chauhan ◽  
P.M. Raole
Keyword(s):  
Laser Beam ◽  
Laser Welding ◽  
Tensile Properties ◽  
Base Metal ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Microstructural Characterization ◽  
Mechanical Tests ◽  
Destructive Testing

Laser beam welding offers various advantages over the other conventional weld processes. In fusion reactor, some critical components with high weld quality are proposed to be fabricated with Laser beam welding. The present paper reports the mechanical properties and micro structural characterization of 8 mm thick SS 316L samples fabricated with high power CO2 Laser welding system. The process parameters of 3.5 kW and speed of 600 mm/min with Argon shielding gas are used. The Laser welded samples are subjected to non destructive testing with X-ray radiography and ultrasonic tests. The welded samples tested have indicated good quality joints with full penetration and no significant porosity and cracks. Further, the samples are subjected to standard mechanical tests namely tensile properties test (UTS), bend test and Impact Fracture test. The Laser weld joints produced better tensile properties as compared to the base metal. In addition, Vickers hardness tests and optical microstructure are studied for the base metal (BM), Heat Affected Zone (HAZ) and weld zone(WZ).

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.

Experimental Determination of the Focal Length of a Laser Beam from the Output Nozzle of a Laser Cutting Head

2017 ◽  
Vol 756 ◽  
pp. 71-79
Author(s):  
Martin Lachman ◽  
Jiří Šafka
Keyword(s):  
Laser Beam ◽  
Laser Cutting ◽  
Focal Point ◽  
Focal Length ◽  
Cutting Speed ◽  
Vital Role ◽  
Fibre Laser ◽  
Cutting Head ◽  
Industrial Operations

Laser technologies are considered to be unconventional technologies. Laser cutting is one of the most popular industrial operations that use a laser beam. Fibre lasers are most commonly used for cutting metallic materials. The aim of this paper is to experimentally demonstrate a procedure for determining the focal length of a laser beam from the output of the cutting head of a JK400FL fibre laser. Along with other factors, the correct position of the focal point of a laser beam cutting materials, plays a vital role in the quality of the cut and also in determining the cutting speed. It is possible to use a higher cutting speed of the laser machine, without compromising the quality of the cut.

scholarly journals Bifocal Hybrid Laser Beam Welding and Friction Stir Welding of Aluminium Extrusion Components

2008 ◽  
Vol 43 ◽  
pp. 69-80 ◽  
Author(s):  
Michael F. Zaeh ◽  
Paul Gebhard ◽  
Sonja Huber ◽  
Markus Ruhstorfer
Keyword(s):  
Composite Materials ◽  
Friction Stir Welding ◽  
Laser Beam ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Global Market ◽  
Fusion Welding ◽  
Critical Parameters ◽  
Process Chain ◽  
Friction Stir

On a global market, new products are subject to rising requirements regarding strength and quality. Simultaneously, the conservation of the environment and natural resources has become a key priority. One approach to these demands is the weight reduction of mechanical components by lightweight construction. The Transregional Collaborative Research Center (TR 10), funded by the German Research Foundation (DFG), is therefore working on the “Integration of forming, cutting and joining for the flexible production of lightweight space structures”. The use of light metals, like aluminium and composite materials is a main part in the TR10 process chain. This paper deals with the challenges of welding of light weight components made out of EN AW-6060. It shows the use and potentials of two innovative joining processes, particularly suited for welding aluminium. Especially developed for the fusion welding of aluminium components, BHLW (Bifocal Hybrid Laser Beam Welding), combines a Nd:YAG and a high power diode laser. The paper will give insight into the findings of the achieved results so far and line out the further proceedings with regard to critical parameters and their effect on the overall laser welding process. For the welding of aluminium composite materials, which play a big role in the TR10 process chain, Friction Stir Welding (FSW) is evaluated. As a solid state joining process, it can be used for the welding of materials that are hardly weldable with fusion welding techniques. In this paper, results of basic experiment for the joining of reinforced aluminium and the resulting process forces are presented.

scholarly journals Influence of the ultrasonic vibration amplitude on the melt pool dynamics and the weld shape of laser beam welded EN AW-6082 utilizing a new excitation system for laser beam welding

2021 ◽  
Author(s):  
H. Ohrdes ◽  
S. Nothdurft ◽  
C. Nowroth ◽  
J. Grajczak ◽  
J. Twiefel ◽  
...  
Keyword(s):  
Laser Beam ◽  
Ultrasonic Vibration ◽  
Vibration Amplitude ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Dissimilar Materials ◽  
Marginal Effect ◽  
Weld Shape ◽  
Melt Pool ◽  
6082 Aluminum Alloy

AbstractLaser beam welding is a commonly used technology for joining similar and dissimilar materials. In order to improve the mechanical properties of the weld, the introduction of ultrasonic vibration into the weld zone has been proposed [5]. The ultrasonic system consists of an electronic control, a power supply, a piezoelectric converter and a sonotrode, which introduces the vibration into the weld zone. Its proper design is of great importance for the process performance. Furthermore, the effects of ultrasound in a melt pool need to be understood to evaluate and optimize the process parameters. In addition, it is important to find out the limits of ultrasonic excitation with respect to a maximum vibration amplitude. Therefore, firstly different methods of ultrasonic excitation are investigated and compared with respect to their performance. A system which is based on using longitudinal vibrations turns out to be the best alternative. Secondly, the system design is described in detail to understand the boundary conditions of the excitation and finally, simulations about the influence of ultrasonic vibrations are done by using a simplified model. The system is used to perform experiments, which aim at detecting the maximum vibration amplitude doing bead on plate welds of EN AW-6082 aluminum alloy. The experiments reveal a significant change of the weld shape with increasing ultrasonic amplitude, which matches the simulative findings. If the amplitudes are small, there is a marginal effect on the weld shape. If the amplitudes are high, melt is ejected and the weld shape is disturbed. In the present case, amplitudes over 4 µm were found to disturb the weld shape.

Double closed-loop control of the focal point position in laser beam welding

2003 ◽  
Vol 14 (11) ◽  
pp. 1938-1943 ◽  
Author(s):  
Zhang Xudong ◽  
Chen Wuzhu ◽  
Jiang Ping ◽  
Liu Chun ◽  
Guo Jing
Keyword(s):  
Laser Beam ◽  
Closed Loop ◽  
Focal Point ◽  
Laser Beam Welding ◽  
Closed Loop Control ◽  
Loop Control ◽  
Point Position

Experiments and efficient simulations of distortions of laser beam–welded thin-sheet close beam steel structures

2018 ◽  
Vol 233 (3) ◽  
pp. 787-796 ◽  
Author(s):  
Oscar Andersson ◽  
Karl Fahlström ◽  
Arne Melander
Keyword(s):  
Laser Beam ◽  
Elevated Temperatures ◽  
Thin Sheet ◽  
Weld Zone ◽  
Laser Beam Welding ◽  
Welding Process ◽  
Steel Structures ◽  
Simulation Method ◽  
Beam Structures ◽  
Shrinkage Method

In this article, geometrical distortions of steel structures due to laser beam welding were analyzed. Two 700-mm-long U-beam structures were welded in overlap configurations: a double U-beam structure and a U-beam/flat structure. The structures were in different material combinations from mild steel to ultrahigh-strength steel welded with different process parameters. Different measures of distortions of the U-beam structures were evaluated after cooling. Significant factors of the welding process and the geometry of the structures were identified. Furthermore, welding distortions were modeled using two predictive finite element simulation models. The previously known shrinkage method and a newly developed time-efficient simulation method were evaluated. The new model describes the effects of expansion and shrinkage of the weld zone during welding and material plasticity at elevated temperatures. The new simulation method has reasonable computation times for industrial applications and improved agreement with experiments compared to the often used so-called shrinkage method.

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