Illustrated Case Studies in the Maintenance Reliability Engineering World of Failure Analysis, Predictive Maintenance, and Non Destructive Evaluation |
|
When considering cyclic stress, it is important to minimize the adverse affects that weld profile and the weld toe have on the overall design. My Christmas present this year was seeing the end to a five year long endeavor. It all started well over five years ago. This month, the welds on the seventh and last stiffening ring on the rotary dryer were ground finished. I wrote a paper on this project. You can read it by going to the home page and clicking on the tab marked "ASM Tech Paper". The race was won. Patience and endurance in the reliability business are prerequisites, and they paid off. Here in this picture to the left, you see the finishing touches being put on the attachment weld. The pictures below show close ups of the attachment weld. It is well known that there are high stresses at the weld toe. Some of the stresses are induced within the weld during the cooling process. Other stresses are induced by the notch affect created by a high toe profile. Still, other stresses are created by the fact that the parent metal surface, if not ground clean prior to welding, usually contains inferior material from the rolling process. The lower right picture says it all. The weld was blended into the stiffening ring and shell; there are no discerning marks to differentiate where the weld toe is located. |
|
 |
 |
|
All Pictures and Text Copyright 2002 - 2016 Contact Mr. Adler Adler Engineering LLC of Wyoming USA |
|
|
Great care has been taken in the compilation of this article. However, no warranty, expressed or implied, including without limitation, warranties of merchantability or fitness for a particular purpose, are given in connection with this article or any article archived on this website. Although this information is believed to be accurate by the author, the author cannot guarantee favorable results will be obtained from the use of this article alone. This article is intended for use by persons at their sole discretion and risk. Since the conditions of product or material use are outside of the author's control, the author assumes no liability or obligation in connection with any use of this information. The author is not liable for special, indirect or consequential damages resulting from the use of this material. No part of this article or any article archived in this website, or any part thereof, may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, without the prior written permission of the copyright holder R. H. Adler. Nothing contained in this article or any article archived in this website shall be construed as a grant of any right of manufacture, sale, use, or reproduction, in connection with any method, process, apparatus, product, composition, or system, whether or not covered by letters of patent, copyright, or trademark, and nothing contained in this article or any article archived in this website, shall be construed as a defense against any alleged infringement of letters of patent, copyright, or trademark, or as a defense against any liability for such infringement. |
