HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
<<  <  Page 2/2
ChasChas
User Rank
Platinum
???
ChasChas   5/21/2012 10:30:51 AM
NO RATINGS
 

Welding dissimilar materials in a marine environment? Seems like I went school for nothing - they keep changing the rules after they teach them.

Interesting article! 

warren@fourward.com
User Rank
Platinum
Re: Laser-Welded Metal Foam Sandwich
warren@fourward.com   5/19/2012 9:38:15 PM
NO RATINGS
I also spend many years in the marine industry, and the dissimilar metal issue arose all the time.  And the center of gravity would certainly rise, but surely this is taken under consideration.

i wonder where they are on using this new material?  I am sure better minds than ours have figured out what the issues are.  Just like they did on the Titanic, er I mean the center fuel tank on the 747s, er I mean the solid-state booster on the space shuttle, er, well, you know what I mean.

Scott Orlosky
User Rank
Platinum
Re: Laser-Welded Metal Foam Sandwich
Scott Orlosky   5/19/2012 8:09:31 PM
NO RATINGS
As excited as I was by the headline, as someone who has spent a lot of time in the marine industry, once I read about a dissimilar metal construction I lost my enthusiasm.  The main place where ships need to save weight is in the superstructure (to make them less "tippy") and that problem has been solved by using all aluminum construction.  An explosion welded bar of steel/aluminum is used to provide a transition from the deck to the superstructure.  Other than that, I have to agree with Warren that the ability to repair stuff easily at sea is paramount.  Structures corrode, crack and come apart due to the constant barrage of vibration, sea spray and racking stresses. Probably best to keep this sandwich either in the air or on solid ground.

warren@fourward.com
User Rank
Platinum
Laser-Welded Metal Foam Sandwich
warren@fourward.com   5/19/2012 4:51:33 PM
NO RATINGS
I wonder about repairs underway?  When you are at sea, you are on your own when trouble occurs.  Can repairs be made without a 6kW laser?  How about standard aluminum welding processes? Can you store on board replacement sections that can be used to reinforce or replace?

And does the sandwich material come with pickles?  Just curious.

Ann R. Thryft
User Rank
Blogger
Re: Interesting process
Ann R. Thryft   5/18/2012 12:47:17 PM
NO RATINGS
Thanks for weighing in on this subject, Dave, with your background in metals. From the description, I visualized lasers trimming away the aluminum foam so it doesn't contact the edges of the panel's top steel sheets, only its internal steel sheets. I saw it somewhat like the peanut butter that slops over the side of a sandwich. Here, the "peanut butter"--perhaps a slice of cheese is a better metaphor-- is cut back so it doesn't stick out that far. Then the "bread slices" are positioned so there's no gap and welded. This may be inaccurate, but that's what I thought it meant. A video sure would be helpful.

Ann R. Thryft
User Rank
Blogger
Re: Basic process
Ann R. Thryft   5/18/2012 12:46:11 PM
NO RATINGS
Thanks, naperlou. I thought the combination of technologies to improve this process was especially interesting. Seems like we're seeing more of that: combining different assembly or manufacturing-related techniques to solve new materials and/or process problems. For instance, yesterday's robots plus lasers in composite repair story
http://www.designnews.com/author.asp?section_id=1392&doc_id=243715

Dave Palmer
User Rank
Platinum
Interesting process
Dave Palmer   5/18/2012 10:55:56 AM
NO RATINGS
Welding dissimilar materials -- especially dissimilar materials with very different thermal characteristics (sheet vs. foam) -- can be a big challenge.  The closest I've come to this is inertia welding a hollow carbon steel tube to a solid stainless steel shaft.  That's challenging enough, but it's child's play compared to the process described in this article.

It wasn't immediately clear to me how trimming the edges of the foam prevents intermetallic formation.  I know that intermetallic formation can be prevented by keeping heating times short, and maybe precise alignment between the aluminum foam and the steel sheet prior to welding helps with this.  The high heating and cooling rates made possible by laser welding might also help.

Thanks for an interesting article!

naperlou
User Rank
Blogger
Basic process
naperlou   5/18/2012 10:01:54 AM
NO RATINGS
Ann, this is an interesting twist on an old technology.  Welding has been around for a long time.  By improving the process new things are possible.  Isn't it interesting what some of these engineers will come up with?

<<  <  Page 2/2


Partner Zone
Latest Analysis
Conventional wisdom holds that MIT, Cal Tech, and Stanford are three of the country’s best undergraduate engineering schools. Unfortunately, when conventional wisdom visits the topic of best engineering schools, it too often leaves out some of the most distinguished programs that don’t happen to offer PhD-level degrees.
Sherlock Ohms highlights stories told by engineers who have used their deductive reasoning and technical prowess to troubleshoot and solve the most perplexing engineering mysteries.
Airbus Defence and Space has 3D printed titanium brackets for communications satellites. The redesigned, one-piece 3D-printed brackets have better thermal resistance than conventionally manufactured parts, can be produced faster, cost 20% less, and save about 1 kg of weight per satellite.
A group of researchers at the Seoul National University have discovered a way to take material from cigarette butts and turn it into a carbon-based material that’s ideal for storing energy and creating a powerful supercapacitor.
Hacking has a long history in the movies, beginning with Tron and War Games and continuing through The Girl with the Dragon Tattoo.
More:Blogs|News
Design News Webinar Series
9/10/2014 11:00 a.m. California / 2:00 p.m. New York
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
9/25/2014 11:00 a.m. California / 2:00 p.m. New York
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Sep 22 - 26, MCU Software Development – A Step-by-Step Guide (Using a Real Eval Board)
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service