Distortion Control: Quenching Apparatus for Hardening Parts: An Overview

2014 ◽  
Vol 3 (4) ◽  
pp. 20130086
Author(s):  
Xinmin Luo ◽  
George E. Totten
Keyword(s):  
Distortion Control ◽  
Quenching Apparatus

Some Aspects of Distortion Control

1983 ◽  
Vol 15 (4) ◽  
pp. 123
Author(s):  
P. D. Lohidakshan
Keyword(s):  
Distortion Control

Pattern placement and shape distortion control using contour-based metrology

2021 ◽  
Author(s):  
Bertrand Le-Gratiet ◽  
Régis Bouyssou ◽  
Julien Ducoté ◽  
Alain Ostrovsky ◽  
Stephanie Audran ◽  
...  
Keyword(s):  
Shape Distortion ◽  
Distortion Control

Distortion control in welded structure with Advanced Submerged Arc Welding

2020 ◽  
Vol 26 ◽  
pp. 1492-1495
Author(s):  
Abhishek Kumar Pandey ◽  
Abhijeet Dixit ◽  
Sunil Pandey ◽  
Pulak Mohan Pandey
Keyword(s):  
Arc Welding ◽  
Submerged Arc Welding ◽  
Distortion Control ◽  
Welded Structure ◽  
Submerged Arc

scholarly journals JPEG2000 encoding with perceptual distortion control

2006 ◽  
Vol 15 (7) ◽  
pp. 1763-1778 ◽  
Author(s):  
Zhen Liu ◽  
L.J. Karam ◽  
A.B. Watson
Keyword(s):  
Perceptual Distortion ◽  
Distortion Control

Engineering and Production Technology for Lightweight Ship Structures, Part II: Distortion Mitigation Technique and Implementation

2007 ◽  
Vol 23 (02) ◽  
pp. 82-93 ◽  
Author(s):  
T. D. Huang ◽  
C. Conrardy ◽  
P. Dong ◽  
P. Keene ◽  
L. Kvidahl ◽  
...  
Keyword(s):  
Laser Scanning ◽  
Steel Structures ◽  
Critical Parameters ◽  
Battelle Memorial Institute ◽  
Functional Requirements ◽  
Ship Structures ◽  
Distortion Control ◽  
Us Navy ◽  
Thin Steel ◽  
Buckling Distortion

Shipboard applications of lightweight structures have increased over recent years in both military and commercial vessels. Thin steel reduces topside weight, enhances mission capability, and improves performance and vessel stability, but the propensity of buckling distortion has increased significantly. At present, several US Navy construction programs are experiencing high rates of buckling distortion on thin steel structures. The standard shipyard practice of fabricating stiffened steel panels by arc welding is one of the major contributors to this distortion. Correcting the distortion is a necessary but time-consuming operation that adds no value and ultimately tends to degrade the quality of the ship structure. With a major initiative funded by the US Navy, Northrop Grumman Ship Systems (NGSS) has undertaken a comprehensive assessment of lightweight structure fabrication technology since 2002. Through collaborative research, significant progress has been achieved in the development of distortion-control techniques. Reverse arching, transient thermal tensioning (TTT), stiffener assembly sequencing, and other preferred manufacturing techniques were developed at NGSS to reduce distortion and eliminate the high rework costs associated with correcting that distortion. Complex lightweight panel structures, which are reinforced by long slender stiffeners along with numerous cutouts and inserts, pose a major challenge for distortion control. The geometric complexity yields a more complicated buckling behavior, which drives the need to develop a more fine-tuned finite element model to determine critical parameters and heating patterns for the TTT process. NGSS has recently teamed with Edison Welding Institute (EWI), Battelle Memorial Institute, and the University of New Orleans on a Navy project to further refine TTT procedures for complex lightweight ship structures. In this paper, functional requirements and the design of TTT process and production equipment are discussed. The refined TTT process will be benchmarked by the test panel observations, and a laser scanning device, LIDAR, will be used to analyze panel distortion topography.

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