FAQT: A Precise System for Welding Process Selection

2022 ◽  
Author(s):  
Mohamed Omar ◽  
Khaled Janada ◽  
Hassan Soltan
Keyword(s):  
Welding Process ◽  
Process Selection

scholarly journals A framework for welding process selection

2020 ◽  
Vol 2 (3) ◽  
Author(s):  
Mohamed Omar ◽  
Hassan Soltan
Keyword(s):  
Welding Process ◽  
Process Selection

scholarly journals Arc Welding Process Selection through a Quality and Costs

2019 ◽  
Vol 9 (03) ◽  
Author(s):  
Ashish Thakur1 ◽  
Hagos Gebrelibanos ◽  
Tadesse Gabrey
Keyword(s):  
Arc Welding ◽  
Welding Process ◽  
Labor Cost ◽  
Process Selection ◽  
Financial Loss ◽  
Operational Costs ◽  
Metal Arc Welding ◽  
Quality Costs ◽  
Arc Welding Process ◽  
Welding Processes

This paper presents a methodology to compare three welding processes, namely SAW (submerged arc welding), SMAW (shield metal arc welding) and GMAW (gas metal arc welding) and to select the best one for a given application. Study is the selection of arc welding process for improving quality and welding cost case in MIE and proposes a method for determining the welding process by comparing time, quality and cost, against one over the other of the three types of Arc welding. The welds were carried out in MIE training center. The selection was based on double criteria: operational costs and non-quality costs. The former is related to the normal costs evaluated in such kind of decision, like consumable cost, labor cost, etc. The is the financial loss suffered by the client every time response variable drifts away from its target value or presents variability. The results indicated that the non-quality and operational costs for the SAW process are slightly lower in comparison to the GMAW and SMAW. SAW is selective among them for quality wise. Therefore, it is the best process for the given application. However; cost incurs little high for GMAW.

scholarly journals A quality and cost approach for welding process selection

2000 ◽  
Vol 22 (3) ◽  
pp. 389-398 ◽  
Author(s):  
César Rezende Silva ◽  
Valtair Antonio Ferraresi ◽  
Américo Scotti
Keyword(s):  
Welding Process ◽  
Process Selection ◽  
Cost Approach

Applications of Welding to Repair Irradiated Reactor Internals

2016 ◽  
Author(s):  
Wayne Lunceford ◽  
Nathan Palm ◽  
Eric Willis ◽  
Jonathan Tatman ◽  
Steven McCracken
Keyword(s):  
Grain Boundaries ◽  
Heat Input ◽  
Welding Process ◽  
Pressure Vessels ◽  
Process Selection ◽  
Weld Repair ◽  
Input Control ◽  
High Concentrations ◽  
Materials Used ◽  
Reactor Internals

As the existing light water reactor (LWR) fleet ages, the weldability of structural materials used to construct the reactor pressure vessels (RPVs) and reactor internals is diminished. The decrease in the weldability in austenitic and ferritic materials is attributed to the formation of helium in the material microstructure. Helium (He) generation occurs during the service life of irradiated reactor internals from neutron transmutation reactions of boron and nickel in these materials. Welding on irradiated materials, if performed without appropriate consideration of fluence exposure and helium generation, can result in a heat affected zone cracking phenomenon termed helium induced cracking (HeIC). The heat input associated with welding is a major factor affecting the coalescence of the generated helium along grain boundaries. As the material cools, the tensile stresses generated from welding can cause cracking to occur along grain boundaries weakened by helium bubble coalescence. In some cases, the preferred or only method of repair or replacement of a reactor internal component is welding. For components located in regions of low thermal fluence, the welding process implementation may be relatively straightforward and only heat input control may be required. However, in high thermal fluence regions, weld repair of irradiated reactor internal components is complicated by the presence of high concentrations of helium and significant care must be taken in welding process selection and heat input control. This paper highlights envisioned applications for weld repair on irradiated reactor internals. It also summarizes recently completed guidance published by the EPRI Materials Reliability Program (MRP) and EPRI BWR Vessel and Internals Project (BWRVIP) which provides an improved basis for plants to assess the weldability of components at various locations within the reactor.

scholarly journals Sustainable Welding Process Selection Based on Weight Space Partitions

Procedia CIRP ◽  
2016 ◽  
Vol 40 ◽  
pp. 127-132 ◽  
Author(s):  
Gunther Sproesser ◽  
Sebastian Schenker ◽  
Andreas Pittner ◽  
Ralf Borndörfer ◽  
Michael Rethmeier ◽  
...  
Keyword(s):  
Welding Process ◽  
Weight Space ◽  
Process Selection

A Computational Modeling Tool for Welding Repair of Irradiated Materials

2013 ◽  
Author(s):  
Zhili Feng ◽  
Ken Wolfe ◽  
Eric Willis
Keyword(s):  
Computational Model ◽  
Heat Input ◽  
Welding Process ◽  
Cost Effective ◽  
High Heat ◽  
Transient Temperature ◽  
Process Conditions ◽  
Process Selection ◽  
Helium Content ◽  
High Heat Input

Weld repairs performed on irradiated reactor components can be problematic due to the presence of entrapped helium in the reactor internal components that is generated by boron and nickel transmutation under neutron irradiation. Under unfavorable conditions of high heat input, high tensile stress and high helium content, sufficient quantities of entrapped helium can migrate to and accumulate at grain boundaries during a welding operation thus resulting in cracks in the weld. Determining crack-free welding conditions solely based on extensive weldability testing for a given welding repair scenario could be very costly, time consuming, and in some cases infeasible. In this work, a computational model has been developed and sufficiently validated as a cost-effective alternative method for making this determination. This computational model considers the transient temperature profile in the material, the stress history in the material and the helium content. It further includes a methodology for determining the amount of helium that is released under the calculated temperature/stress conditions, a method for calculating the degree to which the helium bubbles grow, and a criterion for determining if the resulting helium bubble distribution will result in cracking as the weld cools. This computational tool is benchmarked with available experimental results on welding of irradiated materials. It is shown that such a model can be a cost-effective tool for determining suitable welding process conditions (heat input and process selection) for repair welding of irradiated materials of reactor internals.

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