scholarly journals Research and Development of a Novel TIG Welding Torch for Joining Thin Sheets

2019 ◽  
Vol 9 (23) ◽  
pp. 5260 ◽  
Author(s):  
Ngo Huu Manh ◽  
Nguyen Van Anh ◽  
Nguyen Van Tuan ◽  
Bin Xu ◽  
Murata Akihisa
Keyword(s):  
Welding Current ◽  
Optical Microscope ◽  
Electron Back Scatter Diffraction ◽  
Weld Bead ◽  
Tig Welding ◽  
Bottom Surface ◽  
Thin Sheets ◽  
Tungsten Electrode ◽  
Welding Torch ◽  
Diffraction Patterns

This paper aims to develop a novel tungsten inner gas (TIG) welding torch in order to join thin sheets efficiently. Using a narrowing nozzle (constricted nozzle) inside a conventional TIG torch can critically improve the position accuracy of the tungsten electrode and also the arc plasma characteristics and heat input density. In order to evaluate the efficiency of this new torch, weld bead appearance and cross-section images were examined by an optical microscope, scanning electron microscope (SEM), and electron back scatter diffraction patterns (EBSD). The results showed that in all cases, the weld bead profile was stable without undercut and burn-through. Full penetration weld was seen. The width of weld bead on the bottom surface was increased much in comparison to conventional TIG welding. However, the results from SEM and EBSD images indicated that in the case of low welding current, the blowholes were found out on the side of the thinner material (SS400). The penetration of SUS430 material to SS400 material was not good. It seems that no fusion of SUS430 material to SS400 at the bottom surface can be seen. Meanwhile, no blowholes were seen in the case of high welding current. The penetration was better, and the fusion was reached on the bottom surface.

scholarly journals Orbital TIG Welding of Titanium Tubes with Perforated Bottom Made of Titanium-Clad Steel

2019 ◽  
Vol 19 (3) ◽  
pp. 55-64 ◽  
Author(s):  
J. Górka ◽  
M. Przybyła ◽  
M. Szmul ◽  
A. Chudzio ◽  
D. Ładak
Keyword(s):  
Heat Exchanger ◽  
Welding Process ◽  
Welding Current ◽  
Tig Welding ◽  
Tungsten Electrode ◽  
Acceptance Criteria ◽  
Orbital Welding ◽  
Clad Steel ◽  
Travel Rate

AbstractThe article presents problems accompanying the industrial TIG welding (142) of a heat exchanger perforated bottom made of steel clad with titanium B265 grade 1 with tubes made of titanium B338 grade 2. Research-related tests involved the making of test plates containing simulated imperfections formed during orbital welding. The above-named imperfections resulted from insufficient gas shielding during the welding process, the improper positioning of the tungsten electrode (excessively large or overly small circumference, around which the orbital welding process was performed), an excessive electrode travel rate being the consequence of an improperly set welding programme as well as excessively high welding current. Initial tests enabled the development of the orbital TIG welding of titanium tubes with the perforated bottom made of titanium-clad steel, satisfying acceptance criteria applied during commissioning.

TZM Alloy TIG Welding Process and Microstructure of Welded Joints

2011 ◽  
Vol 291-294 ◽  
pp. 867-871 ◽  
Author(s):  
Hua Wang ◽  
Yun Peng Zhang ◽  
Xiao Yu Zhang
Keyword(s):  
Mechanical Properties ◽  
Gas Flow ◽  
Flaw Detection ◽  
Welding Process ◽  
Microscopic Analysis ◽  
Welding Current ◽  
Fiber Texture ◽  
Weld Bead ◽  
Tig Welding ◽  
Alloy Matrix

In this paper, the effect of welding current of the tungsten inert gas arc (TIG) welding process on weld quality of TZM alloy was investigated and the fracture microstructure and mechanical properties of the welding joints of TZM alloy was analyzed by x-ray flaw detection, metallographic microscopic analysis, scanning electron microscopy and mechanical properties test. The results indicate that the weld bead with excellent mechanical properties can be obtained using the welding process parameter with the welding current of 210A, welding speed of 4 mm/s and the argon gas flow rate of 8~12 L/min. The microstructure of weld presents the large columnar grains in the center of the weld bead and the equiaxed grains in heat-affected zone instead of the lamellar fiber texture of the TZM alloy matrix, which resulted in the weakened strength of the matrix and the improved plasticity of it.

Influence of Welding Current on Formation of Weld Bead in TIG Welding for Joining Thin Plates

2018 ◽  
Vol 29 ◽  
pp. 1-11 ◽  
Author(s):  
Nguyen Van Anh ◽  
Murata Akihisa ◽  
Murata Tadasuke ◽  
Shinichi Tashiro ◽  
Manabu Tanaka
Keyword(s):  
Welding Current ◽  
Initial Study ◽  
Weld Bead ◽  
Thin Plates ◽  
Bottom Surface ◽  
New Novel ◽  
Welding Defects ◽  
Welding Properties ◽  
Weld Bead Size ◽  
Very High

In this paper, a new (novel) welding technology has been applied to join 0.1 mm thin plates. An initial study on the influence of welding current on the welding properties for stainless steel SUS304 plates is discussed in this paper. The weld bead appearance on both top surface and bottom surface was observed by microscope to indicate the change of weld bead size and welding defects. The results showed that by utilizing a constricted nozzle, a good weld bead is found out when the arc length is too short (0.3 mm), welding speed is very high (3000 mm min-1) and base metal is very thin (0.1 mm) with suitable welding conditions.

scholarly journals Análise da influência dos parâmetros de soldagem no processo a arco submerso

2020 ◽  
Vol 1 (49) ◽  
pp. 94
Author(s):  
Marília Aires Bezerra ◽  
João Vitor da Silva Negreiros ◽  
Jomar Meireles Barros ◽  
Divanira Ferreira Maia ◽  
Marcos Mesquita da Silva
Keyword(s):  
Base Metal ◽  
Welding Current ◽  
Strong Relationship ◽  
Weld Bead ◽  
Welding Parameters ◽  
Bead Geometry ◽  
Weld Bead Geometry ◽  
Welding Torch ◽  
Definition Of ◽  
Submerged Arc

This work aimed to analyze the influence of welding parameters on weld bead geometry when applied to the submerged arc process. Specifically, the project carried out: the construction of a welding torch support and flow reservoir, as well as the analysis of the weld bead geometry as a function of the welding parameters. To achieve these objectives, a prototype support for the welding torch in CAD software was created and then fabricated by machining, preparation of the base metal and definition of welding parameters. From then on, welding began. The results showed that the supports provided a good performance for the welding and the geometries of the beads showed a difference in their structure regarding the occurrence of porosity in some beads, having a strong relationship with the stress and the type of flux employed. The contact tip to work distance (CTWD) showed a tendency to decrease current when it increased. In addition, welding current and welding energy showed similar behavior when influencing weld bead geometry. That is, when the current and welding energy increased the height decreased and the width increased.

TEM study of lanthanum aluminate

1990 ◽  
Vol 48 (4) ◽  
pp. 1060-1061
Author(s):  
C.Y. Yang ◽  
Z.R. Huang ◽  
Y.Q. Zhou ◽  
C.Z. Li ◽  
W.H. Yang ◽  
...  
Keyword(s):  
Domain Boundary ◽  
Point Group ◽  
Optical Microscope ◽  
Dark Field ◽  
Zone Axis ◽  
Superconducting Film ◽  
Ion Milling ◽  
Lanthanum Aluminate ◽  
Ring Diameter ◽  
Diffraction Patterns

Lanthanum aluminate(LaAlO3) single crystal as a substrate for high Tc superconducting film has attracted attention recently. We report here a transmission electron microscopy(TEM) study of the crystal structure and phase transformation of LaAlO3 by using Philips EM420 and EM430 microscopes. Single crystals of LaAlO3 were investigated first by optical microscope. Stripe-shaped domains of mm size are clearly seen(Fig.1a), and 90° domain boundary is also obvious. TEM specimens were prepared by mechanical grinding and polishing followed by ion-milling.Fig.lb shows μm size stripe domains of LaAlO3. Convergent beam electron diffraction patterns (CBED) from single domain were taken.Fig. 2a and Fig. 2c are [001] zone axis patterns which show a 4mm symmetry, and the (200) dark field of this zone axis gives 2mm symmetry(fig.2b). Therefore the point group of this crystal is either 4/mmm or m3m. The projection of the first order Laue zone(FOLZ) reflections on zero layer (fig. 2c) shows that the unit cell is face centered. A tetragonal unit ceil is chosen, with a=0.532nm and c=0.753nm, c being determined from the FOLZ ring diameter.

An Investigation of Dissimilar Welding Aluminum Alloys to Stainless Steel by the Tungsten Inert Gas (TIG) Welding Process

2017 ◽  
Vol 904 ◽  
pp. 19-23
Author(s):  
Van Nhat Nguyen ◽  
Quoc Manh Nguyen ◽  
Dang Thi Huong Thao ◽  
Shyh Chour Huang
Keyword(s):  
Stainless Steel ◽  
Aluminum Alloy ◽  
Welding Process ◽  
Dissimilar Materials ◽  
Welding Current ◽  
Tig Welding ◽  
Inert Gas ◽  
Dissimilar Welding ◽  
Adjacent Area ◽  
Welding Seam

Welding dissimilar materials has been widely applied in industries. Some of them are considered this as a strategy to develop their future technology products. Aluminum alloy and stainless steel have differences in physical, thermal, mechanical and metallurgic properties. However, selecting a suitable welding process and welding rods can solve this problem. This research aimed to investigate the T-joint welding between A6061 aluminum alloy and SUS304 stainless steel using new welding rods, Aluma-Steel by the Tungsten Inert Gas (TIG) welding process. The mechanical properties, the characteristics of microstructure, and component analysis of the welds have been investigated by the mechanical testing, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). As a result, the fracture occurred at the adjacent area between welding seam and A6061 alloys plate. The thermal cracking appeared at central welding-seam along the base metals if high welding current. A large amount of copper elements found in the welds due to using the new welding rod, Aluma-Steel rod.

Sign in / Sign up

Export Citation Format

Share Document