Analysis of weld characteristics of micro-plasma arc welding and tungsten inert gas welding of thin stainless steel (304L) sheet

2016 ◽  
Vol 230 (6) ◽  
pp. 1005-1017 ◽  
Author(s):  
Sadaf Batool ◽  
Mushtaq Khan ◽  
Syed Husain Imran Jaffery ◽  
Ashfaq Khan ◽  
Aamir Mubashar ◽  
...  
Keyword(s):  
Arc Welding ◽  
Research Work ◽  
Welding Process ◽  
Inert Gas ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Tungsten Inert Gas Welding ◽  
Welding Processes ◽  
Micro Plasma Arc Welding ◽  
And Tungsten

This research work focuses on comparison of the weld geometry, distortion, microstructure and mechanical properties of thin SS 304 L sheets (0.8 mm thickness) welded using micro-plasma arc welding and tungsten inert gas welding process. Initial experiments were performed to identify suitable processing parameters for micro-plasma arc welding and tungsten inert gas welding processes. Microstructures of welds were analysed using scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. The results indicate that the joint produced by micro-plasma arc welding exhibited higher tensile strength, higher ductility, smaller dendrite size and a narrow heat affected zone. Samples welded by micro-plasma arc welding process had lower distortion as compared to that welded by tungsten inert gas process. Micro-plasma arc welding was shown to be the suitable process for welding of thin 304 L sheets owing to its higher welding speed and better weld properties as compared to the tungsten inert gas welding process.

Review of Wire Arc Additive Manufacturing for 3D Metal Printing

2019 ◽  
Vol 13 (3) ◽  
pp. 346-353 ◽  
Author(s):  
Johnnieew Zhong Li ◽  
Mohd Rizal Alkahari ◽  
Nor Ana Binti Rosli ◽  
Rafidah Hasan ◽  
Mohd Nizam Sudin ◽  
...  
Keyword(s):  
Residual Stress ◽  
Arc Welding ◽  
Inert Gas ◽  
Plasma Arc Welding ◽  
Heat Sources ◽  
Plasma Arc ◽  
Tungsten Inert Gas Welding ◽  
Metal Printing ◽  
3D Metal Printing ◽  
Wire Arc Additive Manufacturing

Wire arc additive manufacturing (WAAM) is a crucial technique in the fabrication of 3D metallic structures. It is increasingly being used worldwide to reduce costs and time. Generally, AM technology is used to overcome the limitations of traditional subtractive manufacturing (SM) for fabricating large-scale components with lower buy-to-fly ratios. There are three heat sources commonly used in WAAM: metal inert gas welding (MIG), tungsten inert gas welding (TIG), and plasma arc welding (PAW). MIG is easier and more convenient than TIG and PAW because it uses a continuous wire spool with the welding torch. Unlike MIG, tungsten inert gas welding (TIG) and plasma arc welding (PAW) need an external wire feed machine to supply the additive materials. WAAM is gaining popularity in the fabrication of 3D metal components, but the process is hard to control due to its inherent residual stress and distortion, which are generated by the high thermal input from its heat sources. Distortion and residual stress are always a challenge for WAAM because they can affect the component’s geometric accuracy and drastically degrade the mechanical properties of the components. In this paper, wire-based and wire arc technology processes for 3D metal printing, including their advantages and limitations are reviewed. The optimization parametric study and modification of WAAM to reduce both residual stress and distortion are tabulated, summarized, and discussed.

scholarly journals Hardfacing of AISI 1020 Steel by Arc Welding in Comparison with TIG Welding Processes

2012 ◽  
Vol 5 (1) ◽  
pp. 119-126 ◽  
Author(s):  
G. R. C. Pradeep ◽  
A. Ramesh ◽  
B. Durga Prasad
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Tig Welding ◽  
Inert Gas ◽  
Sliding Velocity ◽  
Tungsten Inert Gas Welding ◽  
Wear Properties ◽  
Machine Parts ◽  
Arc Welding Process ◽  
Welding Processes

Hardfacing techniques are used for enhancing the life of various machine parts by rebuilding the worn out or eroded or corroded areas in them. In this paper, an attempt has been made to determine the better welding process to hardface AISI 1020 steel based on study of wear and other factors. Two types of welding processes - Arc welding and tungsten inert gas welding (TIG) have been compared. The study revealed that the specimens prepared using TIG welding process yielded better wear properties compared to the specimen prepared using Arc welding process till 1.256 m/s sliding velocity. Also it was observed that the Arc welding process yielded better wear properties for sliding velocities above 1.571 m/s. An attempt was made to study the reasons for getting the said results.© 2013 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved.doi: http://dx.doi.org/10.3329/jsr.v5i1.11899        J. Sci. Res. 5 (1), 119-126 (2013) 

Study of Titanium Foil Welding Using Micro-Plasma Arc Welding

2012 ◽  
Vol 538-541 ◽  
pp. 1469-1472 ◽  
Author(s):  
Fu Xin Wang ◽  
Jian Ping He ◽  
Jia Qiang Fang ◽  
Feng Xiang ◽  
Lei Lei Ren
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Welding Current ◽  
Pulse Frequency ◽  
Titanium Foil ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Micro Plasma Arc Welding ◽  
Welding System ◽  
Peak Value

Ultra-thin Titanium foil, which is widely used in manufacture of thin-walled titanium tubes, automobile parts, medical and other industrial fields, is an excellent structural material. Micro-plasma arc welding system which was developed independently by Shanghai University of Engineering Science was used in the experiments of welding Titanium foil 0.05mm thick. Welding experiments were carried out with matching parameters including welding current type, welding current value, pulse frequency, ratio of peak value and base value of pulse current, amount of lap and the other welding process parameters set constant, achieved one side welding both sides formation and got good welding formation. Based on these experiments, influences on welding quality induced by those factors are analyzed.

Microstructural Effects between AHSS Dissimilar Joints Using MIG and TIG Welding Process

2015 ◽  
Vol 1766 ◽  
pp. 29-35 ◽  
Author(s):  
G.Y. Pérez Medina ◽  
M. Padovani ◽  
M. Merlin ◽  
A.F. Miranda Pérez ◽  
F.A. Reyes Valdés
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
High Hardness ◽  
Inert Gas ◽  
Mechanical Degradation ◽  
Low Alloy Steels ◽  
Dissimilar Joints ◽  
Lap Shear ◽  
Welding Processes

ABSTRACTGas tungsten arc welding-tungsten inert gas (GTAW-TIG) is focused in literature as an alternative choice for joining high strength low alloy steels; this study is performed to compare the differences between gas metal arc welding-metal inert gas (GMAW-MIG) and GTAW welding processes. The aim of this study is to characterize microstructure of dissimilar transformation induced plasticity steels (TRIP) and martensitic welded joints by GMAW and GTAW welding processes. It was found that GMAW process lead to relatively high hardness in the HAZ of TRIP steel, indicating that the resultant microstructure was martensite. In the fusion zone (FZ), a mixture of phases consisting of bainite, ferrite and small areas of martensite were present. Similar phase’s mixtures were found in FZ of GTAW process. The presence of these mixtures of phases did not result in mechanical degradation when the GTAW samples were tested in lap shear tensile testing as the fracture occurred in the heat affected zone. In order to achieve light weight these result are benefits which is applied an autogenous process, where it was shown that without additional weight the out coming welding resulted in a high quality bead with homogeneous mechanical properties and a ductile morphology on the fracture surface. Scanning electron microscopy (SEM) was employed to obtain information about the specimens that provided evidence of ductile morphology.

Determining Keyhole Stability for Plasma Arc Welding Process Control

1999 ◽  
Author(s):  
Shaobin Zhang ◽  
YuMing Zhang
Keyword(s):  
Arc Welding ◽  
Imaging System ◽  
Welding Process ◽  
The State ◽  
Stability Factor ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Upper Limit ◽  
The Stability ◽  
Burn Through

Abstract Stability of the keyhole plays a fundamental role in producing quality welds in keyhole plasma arc welding. Currently, keyhole size is assumed to be a measurement of its stability. To verify this idea, keyhole and weld pool were simultaneously imaged from the opposite side of the welding torch. Experimental results revealed that the width of the keyhole was not correlative with the stability of the keyhole: as long as the keyhole mode was maintained, the width remained constant despite the changes in the welding current and speed. However, it can be used to estimate the lower limit of the pool width for preventing keyhole collapse. Also, the upper limit of the pool width for preventing burn-through is approximately fixed for given applications. Hence, in this study, pool width, its upper limit, and keyhole width were used to determine the margins of the process from collapse and burn-through. To measure the state of the stability of the keyhole process, the stability distance and stability factor were proposed. Based on the imaging system used, the state of the stability can be monitored in real-time.

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