Stage 2A and Stage 2B: Process Qualification

2018 ◽  
pp. 61-78
Author(s):  
Ajay Babu Pazhayattil ◽  
Naheed Sayeed-Desta ◽  
Emilija Fredro-Kumbaradzi ◽  
Jordan Collins
Keyword(s):  
Process Qualification

Dependence of LPBF Surface Roughness on Laser Incidence Angle and Component Build Orientation

2021 ◽  
Author(s):  
Ramesh Subramanian ◽  
David Rule ◽  
Onur Nazik
Keyword(s):  
Surface Roughness ◽  
Gas Turbine ◽  
High Efficiency ◽  
Surface Defects ◽  
Incidence Angle ◽  
Turbine Component ◽  
Potential Applicability ◽  
Process Qualification ◽  
Process Signature ◽  
Manufacturing Technologies

Abstract Laser Powder Bed Fusion (LPBF) of metallic components is unlocking new design options for high efficiency gas turbine component designs not possible by conventional manufacturing technologies. Surface roughness is a key characteristic of LPBF components that impacts heat transfer correlations and crack initiation from co-located surface defects — both are critical for gas turbine component durability and performance. However, even for a single material, there is an increasing diversity in laser machines (single vs multi-laser), layer thicknesses (∼20–80 microns) and orientations to the build plate (upskin, vertical and downskin) that result in significant variability in surface roughness. This study systematically compares the surface roughness across the above-mentioned variables to further develop a repeatable correlation of surface roughness to the angle between the substrate normal and laser incidence direction. This presented data will be discussed in detail, to show potential applicability of this process signature curve across materials, machines, and substrate orientations. Future steps to a rapid process qualification standard for surface roughness, across Siemens Energy’s global manufacturing footprint will also be discussed.

Low cost bumping by stencil printing: process qualification for 200 μm pitch

2000 ◽  
Vol 40 (3) ◽  
pp. 497-505 ◽  
Author(s):  
Joachim Kloeser ◽  
Katrin Heinricht ◽  
Erik Jung ◽  
Liane Lauter ◽  
Andreas Ostmann ◽  
...  
Keyword(s):  
Low Cost ◽  
Stencil Printing ◽  
Printing Process ◽  
Process Qualification

Point Reflector Optical Waveguides for on-wafer process qualification

2014 ◽  
Author(s):  
Daniele Melati ◽  
Francesco Morichetti ◽  
Andrea Melloni
Keyword(s):  
Optical Waveguides ◽  
Process Qualification

UK strategy for process qualification/validation: from concept to practical implementation

2000 ◽  
Vol 22 (3) ◽  
pp. 203-206 ◽  
Author(s):  
Neil Beckman ◽  
Jerard Seghatchian
Keyword(s):  
Practical Implementation ◽  
Process Qualification

Integrity Assessment of Hot Bolting Tool

2016 ◽  
Author(s):  
Guomin Ji ◽  
Madjid Karimirad ◽  
Frank Klæbo ◽  
Per-Christian Irgens
Keyword(s):  
Structural Integrity ◽  
Stress And Strain ◽  
Test Results ◽  
Working Process ◽  
Integrity Assessment ◽  
Nonlinear Contact ◽  
Process Qualification ◽  
Different Dimensions ◽  
Good Agreement ◽  
Classification Society

Hot Bolting is the practice of removing and replacing or freeing and re-tightening bolts on live operating piping and equipment while the system is pressurized. It is potentially hazardous and the utmost caution needs to be exercised when planning and carrying it out. The hot bolting tools designed by Irgens Engineering AS aim to establish a safe barrier for flange connections during the hot bolting operation. Their application would extend the hot bolting operation, increase the safety and simplify the working process. Qualification of new hot bolting tools was carried out by the joint efforts of producer, operator and classification society. The paper addresses a part of the integrity assessment of the new hot bolting tools. The nonlinear finite element analyses were performed by ABAQUS for sequential loading during hot bolting operation under the temperature specified by operator and the nonlinear contact interactions between different components were taken into account in the analysis. In the present study, the structural integrity was investigated for 4″ class 1500 flange with ring gasket and class 150 flanges with IFG gasket of four different dimensions (1/2″, 1.5″, 3″, and 8″). The gasket stress and strain as well as contact pressure of the gasket were studied to investigate the possible leakage. The test was performed for 4″ class 1500 flange with ring gasket by Irgens Engineering AS, and the comparison between analysis and test results showed good agreement both for the gap between flange just outside ring gasket and the flange bolt force.

Process Qualification for a Mobile Robotic Welding System Through Manipulability

2012 ◽  
Author(s):  
Justin Stacy ◽  
Daniel Langley ◽  
Stephen L. Canfield
Keyword(s):  
Mobile Robot ◽  
Motion Control ◽  
Mobile Robotics ◽  
Welding Process ◽  
Robotic Welding ◽  
Market Place ◽  
Validation Process ◽  
Process Validation ◽  
Process Qualification ◽  
Welding System

Advances in mobile robotics make these systems viable alternatives for developing new methods and techniques for manufacturing processes such as welding. When considering welding as a manufacturing process, the ability of the equipment to conduct the weld process must be verified. This step is called weld process validation and is generally conducted when a new machine or technique is introduced to the weld process. Traditionally, the weld validation process has focused on the electro-thermal aspects of the weld process, while the (human) welder qualification provides a certification step to ensure that an operator can perform the motion-control aspects of the weld operation while welding. The lack of industry standards for mechanized welding makes it difficult to introduce mobile robotic welding systems with validated performance in the market place. This paper will propose one approach to consider the motion control portion of the weld process validation for welding systems based on mobile robotic platforms. In particular, this paper will consider a skid-steer type mobile robot that is able to weld in flat, horizontal and vertical orientations. The paper will consider the motion-control portion of the weld validation process and will suggest a method that compares a mobile-robot-based welding process to a baseline (fixed-base track system) welding process through spanning manipulability ellipses. This approach allows general topologies of a mobile robotic welding system to be considered in a general way as a step to making mobile robotic welding a viable welding process.

Repair of Class 1 Control Rod Drive and In-Core Housing Bottom Head Penetrations in BWRs

2005 ◽  
Author(s):  
Greg Harttraft ◽  
Roy Corieri ◽  
Sam Ranganath ◽  
Ken Wolfe ◽  
H. William McCurdy ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Radiation Exposure ◽  
Field Experience ◽  
Expansion Process ◽  
Control Rod ◽  
Water Reactor ◽  
Mechanics Analysis ◽  
Class 1 ◽  
Process Qualification ◽  
Technical Basis

The ASME Section XI committee is developing a code case to permit repair of leakage on Boiling Water Reactor (BWR) bottom head penetrations with a mechanical roll expansion process. This technology has been successfully utilized for this application over the last two decades to address leakage due to Control Rod Drive (CRD) stub tube cracking. The code case defines the technical and administrative requirements for use of the mechanical roll expansion process for repair of Class 1 Control Rod Drive and Incore housing penetrations in the bottom head of BWRs. The code case specifies the process qualification, essential variables, process application, examination and pressure testing requirements for this process. The technical basis of the proposed code case includes detailed fracture mechanics analysis to evaluate the structural consequences of the cracking, metallurgical assessment and extensive testing to determine the load capability of the roll repair joint. Based on this assessment, the successful BWR field experience and the inspections/ qualifications required under the code case, the mechanical roll expansion repair can be used as a permanent repair option for addressing leakage in BWR CRD and In-core housing penetrations, The application of this code case will provide significant reduction in facility down time and will offer a reduction in personnel radiation exposure as compared to welded repair options.

scholarly journals Process Qualification

2003 ◽  
Vol 16 (1) ◽  
pp. 57-66
Author(s):  
John J. Flaig ◽  
William C. Spencer
Keyword(s):  
Process Qualification
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