Case Study on LBB Application for Field Fabrication Weld Metal of Nuclear Primary Piping Systems

2003 ◽  
Author(s):  
K. C. Kim ◽  
J. T. Kim ◽  
J. I. Suk ◽  
H. K. Kwon ◽  
U. H. Sung ◽  
...  
Keyword(s):  
Weld Metal ◽  
Carbon Content ◽  
Arc Welding ◽  
Filler Metal ◽  
Welding Process ◽  
Test Results ◽  
Fracture Characteristics ◽  
Reactor Coolant ◽  
Piping Systems ◽  
Arc Welding Process

In order to apply leak before break (LBB) design for nuclear primary piping systems, dynamic and static J-R tests of field fabrication weld metal were carried out to determine mechanical properties at 316°C. For the reactor coolant piping system made by SMAW (Shielded Metal Arc Welding) process of the SA508 Cl.1a, the variation of J-R fracture characteristics with the loading rate of 1mm/min and 1,000mm/min was examined to prevent the catastrophic break under seismic loading. In the J-R test results, the J-R curves at 1,000mm/min are about 60% higher than those at 1mm/min. It suggests that the welding joints of the reactor coolant piping may be susceptible to dynamic strain aging at 316°C. For the surge line piping made by GTAW (Gas Tungsten Arc Welding) process of the SA312 TP347, excellent static J-R properties are required because the nominal diameter of the pipe is relatively small size of 12 inch. In order to examine the effect of carbon content in the filler metal on the fracture toughness of its welded metal, weld metal specimens were made by using 3 kinds of filler metals whose carbon contents were 0.050, 0.030 and 0.025%, respectively. In the static J-R test results, weld metal made by one of three electrodes satisfied the LBB acceptance criteria. Much better J-R fracture characteristics with decreasing carbon content of filler metal can be shown.

Some Feasibility Studies for Recycling of Steel Slag as a Useful Flux for Submerged Arc Welding

2020 ◽  
Vol 19 (02) ◽  
pp. 277-289
Author(s):  
Sumit Saini ◽  
Kulwant Singh
Keyword(s):  
Weld Metal ◽  
Arc Welding ◽  
Steel Slag ◽  
Welding Process ◽  
Feasibility Studies ◽  
Submerged Arc Welding ◽  
Bead Geometry ◽  
Weld Bead Geometry ◽  
Arc Welding Process ◽  
Submerged Arc

Protection of environment from industrialization and urbanization waste is the prime duty of engineers and researchers. Elimination of industrial waste completely is not possible because it is generally a byproduct of the process. It can be minimized by recycling or reusing. In this research, waste slag generated by steel plant is recycled as a useful flux for submerged arc welding. It is found that recycled slag is capable of producing acceptable weld bead geometry. The penetration achieved using recycled slag is 7.897[Formula: see text]mm, which is more than the penetration obtained using fresh flux, i.e. 6.027[Formula: see text]mm. The reinforcement produced by recycled slag is 2.632[Formula: see text]mm, which is close to the reinforcement obtained using fresh flux. It is further observed that chemistry of weld metal deposited using recycled slag is also at par with that of weld metal produced using fresh original flux. The amount of carbon present in weld metal produced by recycled slag is 0.15%, which is comparable to the percentage of carbon present in weld metal produced using fresh flux. The microstructure and microhardness obtained using recycled slag are also comparable with the microstructure and microhardness obtained using fresh flux. This research established the feasibility of recycling slag as a flux required for submerged arc welding process.

scholarly journals The FN Process-A New Submerged-Arc Welding Process to Improve Toughness of Weld Metal (Report 1)

1964 ◽  
Vol 33 (1) ◽  
pp. 38-54 ◽  
Author(s):  
Tomomichi Hotta ◽  
Toyoaki Bada ◽  
Norio Tanaka ◽  
Izumi Morimoto ◽  
Hiroshi Nakayama
Keyword(s):  
Weld Metal ◽  
Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Arc Welding Process ◽  
Submerged Arc

The Influence of Gas Metal Arc Welding Parameters on the Carbon Steel ss400 Grade by Using 23 Factorial Design

2011 ◽  
Vol 341-342 ◽  
pp. 11-15
Author(s):  
Prachya Peasura ◽  
Mongkol Chaisri
Keyword(s):  
Weld Metal ◽  
Feed Rate ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Travel Speed ◽  
Factors Affecting ◽  
Metal Arc Welding ◽  
Arc Welding Process ◽  
Wire Feed

The experimental observation reveals that the influence of gas metal arc welding process on physical properties. The specimen was carbon steel ss400 grade sheet of 6 mm. The experiments with 23 factorial design. The factors used in this study are voltage at 20 and 23 V, travel speed at 5 and 7 mm/sec and wire feed rate were set at 80 and 110 mm/sec. The welded specimens were tested by penetration, width of weld metal and high of weld metal. The result showed that the voltage, travel speed and wire feed rate had interaction on penetration, width of weld metal and high of weld metal at 95% confidential (P value < 0.05). Factors affecting the penetration are the most voltage of 23 V, travel speed 7 mm/sec and wire feed rate 110 mm/sec. were penetration of 31.68 mm. The width of weld metal was most at 9.9 mm. on voltage of 23 V, travel speed 5 mm/sec and wire feed rate 110 mm/sec. The factors affecting the high of weld metal are most voltage of 20 V, travel speed 5 mm/sec and wire feed rate 110 mm/sec. were penetration of 4.51 mm. This research can bring information to the foundation in choosing the appropriate parameters to gas metal arc welding process.

scholarly journals Influence of the formulation of a flux-cored wire on the microstructure and hardness of welded metal

2021 ◽  
Vol 2118 (1) ◽  
pp. 012010
Author(s):  
E C Amaral ◽  
J L Jácome-Carrascal ◽  
A M Moreno-Uribe ◽  
A Q Bracarense
Keyword(s):  
Weld Metal ◽  
Arc Welding ◽  
Welding Process ◽  
The Other ◽  
Volumetric Fraction ◽  
Cored Wire ◽  
Flux Cored Arc Welding ◽  
Arc Welding Process ◽  
Hardness Values ◽  
Robotics Welding

Abstract For this paper, the microstructure and hardness of the weld metal were investigated by conducting experiments with the flux cored arc welding process in underwater and air conditions. A rutile/oxidizing tubular wire was used, manufactured by the Robotics, Welding and Simulation Laboratory at Minas Gerais Federal University, especially for underwater wet welding. Underwater welds had a lower volumetric fraction of acicular ferrite in the weld metal compared to air welds. In the thermally affected zone, for both welds, there was a predominant formation of martensite. However, the grain size and width of the thermally affected zone of underwater welds are smaller. The hardness values shown correspond to the microstructure formed in the weld metal. On the other hand, in the region of the thermally affected zone, the hardness values were higher underwater welds, due to the smaller martensite grains presented.

The Determination of Noxes Emissions in Case of Manual Arc Welding Process with Coated Electrode

2018 ◽  
Vol 69 (7) ◽  
pp. 1826-1829
Author(s):  
Claudiu Babis ◽  
Augustin Semenescu ◽  
Oana Roxana Chivu ◽  
Maria Alina Gligor ◽  
Gabriel Iacobescu ◽  
...  
Keyword(s):  
Production System ◽  
Arc Welding ◽  
Welding Process ◽  
Practical Method ◽  
Machine Building ◽  
Short Exposure ◽  
Metal Bath ◽  
Coated Electrode ◽  
Manual Arc Welding ◽  
Arc Welding Process

The occupational risk assessment of a machine building company must cover each activity and workstation, taking into account each component of the production system (work system), each workload, work equipment and the work environment. This assessment is an extremely complicated and complex issue since the production system of such an enterprise is particularly complex and complicated. Welding assembly is a highly polluting technology process, especially of the atmosphere and soil. The formation of gases in the welding process is the result of burning of the electrodes, powders, forming the molten metal bath and making the weld seam. Welding operators are exposed to smoke and toxic gases resulting from the welding process, which can in many cases be hazardous to health. Many acute intoxications that may be caused by excessive exposure to or short exposure to smoke and gas resulting from the welding process have been studied over time. In the paper are presented the elements of risk related to the welding process and the most widespread occupational diseases that can occur in the ranges of the welding operators. The following are presented the noxious emissions from welding and are determined by a practical method the emission of noxious at welding deposition of a welding sample, using the manual arc welding process with coated electrode.

Sign in / Sign up

Export Citation Format

Share Document