Effect of Beam Oscillations on Formation of Defects in Electron Beam Welding of Copper Plate

2019 ◽  
Author(s):  
Sanjib Jaypuria ◽  
Debalay Chakrabarti ◽  
D. K. Pratihar ◽  
M. N. Jha
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
Volume Fraction ◽  
Oscillation Amplitude ◽  
Copper Plate ◽  
Random Oscillation ◽  
Large Size ◽  
Mean Diameter ◽  
Beam Oscillation

Abstract In the present study, electron beam welding bead-on-plate of electrolytic pitched copper (ETP-Cu) plate was carried out to study the behavior of different defects formed in the weld by varying the beam oscillation amplitudes. The defects like spattering, spiking and porosity were considered in this study. Spattering and spiking phenomena were determined with visual inspection and image analysis software, respectively. Porosity measurement was conducted with X-ray tomography. Spattering was found to decrease with the oscillation amplitude up to the optimized value and then, it showed an increasing effect with it. Spatters in the weld also contributed to the pore formation in the weld by the inside pores available in it. Spiking was found to be more dynamic, and not directly related to the oscillation amplitude. But, in general, it was increasing with the increase of amplitude. Spiking was found to have a linear relationship with mean diameter of pores, which implied that a weld with the sharper spikes was more prone to large size root pores in the weld. Mean diameter and volume fraction of the pores were tending to increase with oscillation amplitude; however, there were discontinuities in the trend at the optimized amplitude value. An optimized value of oscillation amplitude was found to be useful for suppressing these defects in the weld. However, a random oscillation amplitude could be more detrimental to the quality of the weld joint.

Influence of Electron Beam Technological Movements on Aluminium Alloy AW2099 Welded Joints Properties

2020 ◽  
Vol 994 ◽  
pp. 36-43
Author(s):  
Ján Urminský ◽  
Milan Marônek ◽  
Jozef Bárta ◽  
Michaela Lopatková ◽  
Róbert Hrušecký
Keyword(s):  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Welding Current ◽  
Welding Parameters ◽  
Porosity Formation ◽  
Surface Appearance ◽  
Current Focusing ◽  
Acceleration Voltage ◽  
Beam Oscillation

The electron beam welding (EBW) parameters have significant influence on weld surface appearance and porosity formation. Besides basic welding parameters, such as acceleration voltage, welding current, focusing current and welding speed, the beam oscillation during EBW plays an important role in weld metal formation and directly impacts the final welded joints properties. The influence of technological movements during EBW on the properties of aluminium-lithium alloy welded joints was studied. The same frequency and different amplitude as well as same amplitude and different frequency were chosen. The other welding parameters were constant.

A Study of the Influence of Electron Beam Welding Defects on Fracture Processes in Titanium Alloys

2020 ◽  
pp. 23-34
Author(s):  
V.V. Grigoriev ◽  
V.I. Muravyev ◽  
P.V. Bakhmatov
Keyword(s):  
Electron Beam ◽  
Titanium Alloys ◽  
Welded Joints ◽  
Pore Formation ◽  
Electron Beam Welding ◽  
Strength Properties ◽  
Technical Documentation ◽  
Welding Defects ◽  
Static And Dynamic Loads

The appearance of pores when welding titanium has been extensively studied by domestic and foreign researchers, but there has been no consensus on the causes and conditions of pore formation to date. An overview of advances in the studies of pore formation showed that the problem of formation of the macropores, reaching 0.1 mm was investigated by A.A. Erokhin, V.V. Frolov, G.D. Nikiforov, S.M. Gurevich, V.N. Locks, V.I. Muravyev, B.I. Dolotov, P.V. Bakhmatov et al. The advent of modern x-ray machines in the technological control of permanent joints made by electron beam welding has enabled researchers to detect a specific defect — the so-called dark bands, which make it difficult to assess the quality of permanent connections due to the absence of this defect in the normative and technical documentation. Determining the causes of specific defects and their effect on the properties of titanium alloy structures made by electron beam welding is an important task. This paper presents the results of studies investigating the effect of specific defects of electron beam welding of titanium alloys VT20, VT23 on the nature of destruction under static and dynamic loads and changes in the mechanical properties of the welded joints. It is established that specific defects occurred during electron beam welding have a significant impact on the strength properties of welded joints, as well as on the stages of their destruction. It is determined that the presence of such welding defects as lack of penetration, residual stresses and pores in the fusion zone, expulsion without bonding, etc. contribute to the formation of sub-micropores that lead to brittle destruction of welded joints. The presence of specific defects in permanent joints made by electron beam welding leads to decreased strength properties and to nearly complete absence of such characteristics as elongation and contraction. It is established that heat treatment improves the quality of welded joints.

Influence of beam oscillation in electron beam welding of Ti-6AL-4V

2017 ◽  
Vol 94 (9-12) ◽  
pp. 4531-4541 ◽  
Author(s):  
Jyotirmaya Kar ◽  
Sanat Kumar Roy ◽  
Gour Gopal Roy
Keyword(s):  
Electron Beam ◽  
Electron Beam Welding ◽  
Beam Oscillation

scholarly journals Electron beam welding of large-size thick-wall structures of magnesium alloys

2014 ◽  
Vol 2014 (2) ◽  
pp. 37-41
Author(s):  
V.M. Nesterenkov ◽  
◽  
A.A. Bondarev ◽  
Keyword(s):  
Electron Beam ◽  
Magnesium Alloys ◽  
Electron Beam Welding ◽  
Thick Wall ◽  
Large Size ◽  
Wall Structures

scholarly journals Design of replaceable nozzles for connecting pipelines in electron beam welding

2021 ◽  
Vol 2094 (4) ◽  
pp. 042015
Author(s):  
V S Tynchenko ◽  
V A Kukartsev ◽  
S G Dokshanin ◽  
A V Fedorova ◽  
V Slinitsyna ◽  
...  
Keyword(s):  
Electron Beam ◽  
Welded Joints ◽  
Oil And Gas ◽  
Electron Beam Welding ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Advantages And Disadvantages ◽  
Welding Technology ◽  
Welded Seam

Abstract The article is devoted to the use of electron beam welding for connecting pipelines in the oil and gas industry. The analysis of the proposed approach and equipment for creating permanent pipe-flange connections is carried out. The advantages and disadvantages of the proposed approach are considered. During the work, the welded seam was calculated. A set of interchangeable attachments for the turntable has also been developed. Thus, the purpose of this work is to improve the quality of welded joints of oil and gas equipment through the use of electron-beam welding technology and design of replaceable nozzles for a turntable for an electron-beam welding unit.

Research on the quality of welded joints of P265GH heatresistant steel pipes at electron beam mechanized welding

2020 ◽  
Vol 65 (1) ◽  
pp. 21-28
Author(s):  
Lenuța Cîndea
Keyword(s):  
Electron Beam ◽  
Welded Joints ◽  
Electron Beam Welding ◽  
Steel Pipes ◽  
Knowing That ◽  
Mechanized Welding ◽  
Mechanical Metallurgy ◽  
Welded Seam ◽  
Local Hardening

This paper analyzes the quality of welded joints of high temperature resistant steel pipe at electron beam welding, knowing that the mechanical properties of these types of steels are influenced by the interaction of different processes specific to physical and mechanical metallurgy. Analyzing the values of the local hardening estimator ΔHV10 calculated between the characteristic areas of welded joints, it is observed that it has a decreasing tendency at thermally de-stressed joints, in all areas of the welded joints, especially in the welded seam.

Numerical Modelling of Electron Beam Welding of Pure Niobium with Beam Oscillation: Towards Industry 4.0

2021 ◽  
Author(s):  
Yi Yin ◽  
Vitalijs Jefimovs ◽  
Tim Mitchell ◽  
Andrew Kennedy ◽  
Darren Williams ◽  
...  
Keyword(s):  
Electron Beam ◽  
Numerical Modelling ◽  
Industry 4.0 ◽  
Electron Beam Welding ◽  
Pure Niobium ◽  
Beam Oscillation

scholarly journals Electron Beam Welding of Rolled and Laser Powder Bed Fused Inconel 718

2021 ◽  
Author(s):  
Akash Sali ◽  
Vivek Patel ◽  
James Hyder ◽  
David Hyder ◽  
Mike Corliss ◽  
...  
Keyword(s):  
Electron Beam ◽  
Heat Input ◽  
Inconel 718 ◽  
Electron Beam Welding ◽  
High Heat ◽  
Chemical Compositions ◽  
Minimum Requirement ◽  
Powder Bed ◽  
Processing Techniques

Abstract This paper explores the feasibility of welding Inconel 718 (IN718) and compares the quality of electron beam welded samples produced by rolling and laser-based powder bed fused (L-PBF). Electron beam heat input, varying in the range 175-300 J/mm, was the main parameter in welding. Microhardness, tensile properties, and fractography study using both optical and scanning electron microscopy were employed to analyze and compare the quality of the welded samples. Energy dispersive x-ray analysis was used to identify chemical compositions of different phases on the fractured surfaces. Large voids were observed at high heat inputs (≥ 213 J/mm). Excellent weld penetration was obtained and was proportional to the beam heat input. Both yield and tensile strength of the welded L-PBF’ed materials exceeded those of rolled materials and met the minimum requirement from ASTM specification; however, the ductility of welded L-PBF’ed material did not. The brittleness of these L-PBF’ed materials came from the brittle Laves phase and Al-Ti-O compounds in the microstructure and non-optimal L-PBF parameters. These drawbacks can be further reduced by adjusting the L-PBF parameters and suitable post-processing techniques before electron beam welding.

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