scholarly journals An Overview of Arc Welding Control Systems

2019 ◽  
Vol 1 (4) ◽  
Author(s):  
Primož Podržaj
Keyword(s):  
Image Processing ◽  
Control Systems ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Feedback Signal ◽  
Research Papers ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Feedback Control Systems ◽  
Physical Background

In this paper an overview of arc welding control systems is given. At first some basic physical background of the process is given. Then the two most important subtypes Gas tungsten arc welding (GTAW) and Gas metal arc welding (GMAW) are presented in some detail. In order to understand the logic of feedback control systems, the most essential control theory is outlined shortly. In the overview of control systems a feedback signal is used a means of division. The analysis of recent research papers in the area has shown that recently image processing based control systems seem to be the most popular ones.

Welding: Particulate and Gaseous Emissions

2019 ◽  
Author(s):  
Cole Homer ◽  
Epstein Seymour ◽  
Peace Jon
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Pure Metal ◽  
Gaseous Emissions ◽  
Hazard Communication ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Electric Arc Welding ◽  
And Control

Fabrication and repair of aluminum components and structures commonly involves the use of electric arc welding. The interaction of the arc and the metal being welded generates ultraviolet radiation, metallic oxides, fumes, and gases. Aluminum is seldom used as the pure metal but is often alloyed with other metals to improve strength and other physical properties. Therefore, the exact composition of any emissions will depend on the welding process and the particular aluminum alloy being welded. To quantify such emissions, The Aluminum Association sponsored several studies to characterize arc welding emissions by the gas metal arc welding (GMAW) and gas tungsten arc welding (GTAW) processes for various combinations of base and filler alloys. In all cases, the tests were conducted under conditions that could be found in a production weld shop without forced ventilation. The concentrations of each analyte that a welder could be exposed to were greatly affected by the welding process, the composition of the base and filler alloys, the position of the welder, and the welding helmet. The results obtained can be used by employers to identify and control potential hazards associated with the welding of aluminum alloys and can provide the basis for hazard communication to employees involved in the welding of these alloys.

A study on sustainability assessment of welding processes

2019 ◽  
Vol 234 (3) ◽  
pp. 501-512 ◽  
Author(s):  
Jaber Jamal ◽  
Basil Darras ◽  
Hossam Kishawy
Keyword(s):  
Arc Welding ◽  
Social Impact ◽  
Sustainability Assessment ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Friction Stir ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Sustainability Assessments ◽  
Welding Processes

The concept of “sustainability” has recently risen to take the old concept of going “green” further. This article presents general methodologies for sustainability assessments. These were then adapted to measure and assess the sustainability of welding processes through building a complete framework, to determine the best welding process for a particular application. To apply this methodology, data about the welding processes would be collected and segregated into four categories: environmental impact, economic impact, social impact, and physical performance. The performance of each category would then be aggregated into a single sustainability score. To demonstrate the capability of this methodology, case studies of three different welding processes were performed. Friction stir welding obtained the highest overall sustainability score compared to gas tungsten arc welding and gas metal arc welding.

Strong noise image processing for vision-based seam tracking in robotic gas metal arc welding

2018 ◽  
Vol 101 (5-8) ◽  
pp. 2135-2149 ◽  
Author(s):  
Rongqiang Du ◽  
Yanling Xu ◽  
Zhen Hou ◽  
Jun Shu ◽  
Shanben Chen
Keyword(s):  
Image Processing ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Seam Tracking ◽  
Metal Arc Welding ◽  
Noise Image

Arc Interruptions in Tandem Pulsed Gas Metal Arc Welding

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Ruham Pablo Reis ◽  
Daniel Souza ◽  
Demostenes Ferreira Filho
Keyword(s):  
Arc Welding ◽  
High Speed ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Electrical Current ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Two Factors ◽  
Single Arc ◽  
Mean Current

In addition to electromagnetic attraction between the arcs in Tandem Pulsed gas metal arc welding (GMAW), arc interruptions, mostly in the trailing arc at low mean current levels, may also occur, which is a phenomenon not widely discussed in the welding field. These arc interruptions must be avoided, since they also represent interruptions in metal fusion and deposition during the welding process, leading to lack of fusion/penetration and/or deposition flaws, adding cost for repairing operations. To improve the understanding on arc interruptions in Tandem Pulsed GMAW and how the current pulsing synchronism between the arcs relates to this phenomenon, this work proposes to evaluate the influence of parameters of adjacent arcs (Tandem Pulsed GMAW) and also of a single arc (GTAW—gas tungsten arc welding), but similarly subjected to magnetic deflection, on the occurrence of arc interruptions/extinctions. High-speed filming was used to help understand the interruption/extinction mechanism. In the case of Tandem Pulsed GMAW, the pulses of current of the leading and trailing arcs need to be almost-in-phase to prevent interruptions in the trailing arc. The distance of 10 mm between the adjacent arcs helped reduce the incidence of trailing arc interruptions, yet keeping a sound weld visual quality. In the case of GTAW, the higher the electrical current flowing through the arcs and the shorter their lengths, the more they resist to the extinction. The trailing arc interruptions in Tandem Pulsed GMAW seem to be determined by the deflection and heat in this arc, and their prevention can be achieved by a balance between these two factors, which is reached by synchronized pulsing currents.

Evaluation on Microstructure and Mechanical Properties of Welded Joints by GMAW in UNS N10003 Alloy

2017 ◽  
Author(s):  
Kun Yu ◽  
Zhenguo Jiang ◽  
Xianwu Shi ◽  
Chaowen Li ◽  
Shuangjian Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Arc Welding ◽  
Welded Joint ◽  
Gas Metal Arc Welding ◽  
Suitable Candidate ◽  
Gas Tungsten Arc ◽  
Large Size ◽  
Metal Arc Welding ◽  
Nickel Base ◽  
Thorium Molten Salt Reactor

UNS N10003 alloy is a primary material of the Thorium Molten Salt Reactor (TMSR) in China that is a suitable candidate reactor of the Generation IV nuclear reactors. Gas metal arc welding (GMAW) is more effective than gas tungsten arc welding (GTAW) which is usually used to weld nickel-base alloys. In order to improve welding efficiency, it is necessary to weld nickel-base alloys using GMAW. The purpose of this work is to evaluate effect of GMAW on microstructure evolution and mechanical properties in UNS N10003 alloy. The results of microstructure showed that the sound welded joint without hot cracking can be obtained, although quantities of M6C-γ eutectic phases with large size were precipitated in fusion zone (FZ) and transformed in heat affected zone (HAZ) because of element segregation. The results of microhardness test indicated that there was no softened zone in the welded joint. The results of tensile test at room temperature and high temperature showed that the short-term time-independent strength was not damaged by the formation of large M6C-γ eutectic phases.

Hybrid Welding of AA5754-H111 Alloy Using a Fiber Laser

2012 ◽  
Vol 628 ◽  
pp. 193-198 ◽  
Author(s):  
Giuseppe Casalino ◽  
Sabina Campanelli ◽  
Antonio D. Ludovico
Keyword(s):  
Fiber Laser ◽  
High Power ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Spot Size ◽  
Welding Parameters ◽  
Hybrid Welding ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
New Generation

The new generation of high power fiber lasers presents several benefits for industrial application. Nevertheless, due to the small spot size of the laser, the fiber laser has difficulties in some welding applications. These shortcomings can be overcome by laser-arc hybrid welding technique such as laser-gas metal arc welding or laser-gas tungsten arc welding. In this work, a high power fiber laser was coupled to an arc welder and the AA5754-H111 magnesium aluminum alloy was welded. The trials were carried out using laser leading configuration. A new generation of high power fiber laser was used. The experimental trials included process parameters such as laser power, welding speed and arc current. Microstructure, microhardness and weld appearance were analyzed. The experimental results showed that laser leading configuration produces full penetration for some welding parameters. The obtained results worth a larger investigation based on the experimental design technique.

scholarly journals Advanced Gas Tungsten Arc Weld Surfacing Current Status and Application

2015 ◽  
Vol 20 (3) ◽  
pp. 300-314 ◽  
Author(s):  
Stephan Egerland ◽  
Johannes Zimmer ◽  
Roland Brunmaier ◽  
Roland Nussbaumer ◽  
Gerhard Posch ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Current Status ◽  
Filler Materials ◽  
Hot Wire ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Welding Automation ◽  
Increase Productivity ◽  
Nickel Base

Abstract Gas Shielded Tungsten Arc Welding (GTAW) – a process well-known providing highest quality weld results joined though by lower performance. Gas Metal Arc Welding (GMAW) is frequently chosen to increase productivity along with broadly accepted quality. Those industry segments, especially required to produce high quality corrosion resistant weld surfacing e.g. applying nickel base filler materials, are regularly in consistent demand to comply with "zero defect" criteria. In this conjunction weld performance limitations are overcome employing advanced 'hot-wire' GTAW systems. This paper, from a Welding Automation perspective, describes the technology of such devices and deals with the current status is this field – namely the application of dual-cathode hot-wire electrode GTAW cladding; considerably broadening achievable limits.

INCO-WELD FILLER METAL C-276

Alloy Digest ◽  
2008 ◽  
Vol 57 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Arc Welding ◽  
Filler Metal ◽  
Gas Metal Arc Welding ◽  
Charpy Impact ◽  
Minimum Requirement ◽  
Charpy Impact Toughness ◽  
Gas Tungsten Arc ◽  
Metal Arc Welding ◽  
Metal Processing

Abstract Inco-Weld C-276 (ERNiCrMo-4) is a NiCrMo filler metal with increased molybdenum, tungsten, and reduced niobium and is suited to both gas metal arc welding (GMAW) or gas tungsten arc welding (GTAW) processes, either manually or fully automated. The alloy offers strength levels consistently exceeding the minimum requirement of the 9% Ni steels, excellent Charpy impact toughness at −196 deg C (−321 deg F), and improved wire delivery to the weld pool resulting from controlled filler metal processing. This datasheet provides information on composition and tensile properties. It also includes information on corrosion resistance as well as forming. Filing Code: Ni-657. Producer or source: Special Metals Welding Products Company.

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