Miller Electric

Welding Discussion Forums

Home » Resources » Communities » Welding Discussion Forums
 
Miller Welding Discussion Forums - Powered by vBulletin

Results 1 to 6 of 6
  1. #1
    turbo38t Guest

    Default NJIT Steel Bridge Competition 2012

    My company is building the steel bridge for the NJIT school's yearly civil engineering competition. I got the honors to do the welding/fabrication again. Most of the tubing is 1/2" 3/4" 4130 tubing with wall thickness ranging from .037"-.323" or somewhere's around there. It's a lot easier to weld than the .037 wall 1/4" and 5/16" tubing I did last year. I'm using er80-s2 1/16" wire with a syncrowave 250dx and a 20M watercooled torch. Gold lanthanated tungsten in 1/16" is the choice(by defaultI guess with a small amount of my input). Some of the tubing is cleaed at the copes, other is mill scale. I'm told to weld as is so brake clean is all I can use. The fixture is made of 1" aluminum plate with all the details CNCd into it. Most fittings are single shear while the main trusses use a male/female tubular slide fitting that has a 1/4" bolt to hold tight.The lower truss fittings are cylindrical single shear in design. Here are a couple of pics from the first day of fab. DaveBridge2.jpgBridge.jpg

  2. #2
    turbo38t Guest

    Default

    some more pics....Bridge23.jpgBridge24.jpgBridge25.jpgBridgeXmember1.jpgBridgeXmember2.jpg
    Quote Originally Posted by turbo38t View Post
    My company is building the steel bridge for the NJIT school's yearly civil engineering competition. I got the honors to do the welding/fabrication again. Most of the tubing is 1/2" 3/4" 4130 tubing with wall thickness ranging from .037"-.323" or somewhere's around there. It's a lot easier to weld than the .037 wall 1/4" and 5/16" tubing I did last year. I'm using er80-s2 1/16" wire with a syncrowave 250dx and a 20M watercooled torch. Gold lanthanated tungsten in 1/16" is the choice(by defaultI guess with a small amount of my input). Some of the tubing is cleaed at the copes, other is mill scale. I'm told to weld as is so brake clean is all I can use. The fixture is made of 1" aluminum plate with all the details CNCd into it. Most fittings are single shear while the main trusses use a male/female tubular slide fitting that has a 1/4" bolt to hold tight.The lower truss fittings are cylindrical single shear in design. Here are a couple of pics from the first day of fab. DaveBridge2.jpgBridge.jpg

  3. #3
    Join Date
    May 2011
    Location
    Bossier Parish La.
    Posts
    503

    Default

    This is kind of interesting. Do you have any photos of the completed one from last year? As well as some of the construction photos. That might give us an idea of what the overall project is about.

  4. #4
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    768

    Default

    If I'm reading your post right you're saying you can use brake cleaner?

    "I'm told to weld as is so brake clean is all I can use." DONT USE IT...welding heat turns it into phosgene gas. It can kill you.


    Read this article

    http://www.brewracingframes.com/id75.htm

  5. #5
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,861

    Cool

    No brake clean for me either. And yes i like to make bridges too. I have made miles of them...Bob
    Attached Images Attached Images
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  6. #6
    turbo38t Guest

    Default

    Sorry, I use the non-chrorinated. Only the chlorinated (red can) Brakleen turns into Phosgene gas. The other type evaporates. Dave
    Quote Originally Posted by tackit View Post
    If I'm reading your post right you're saying you can use brake cleaner?

    "I'm told to weld as is so brake clean is all I can use." DONT USE IT...welding heat turns it into phosgene gas. It can kill you.


    Read this article

    http://www.brewracingframes.com/id75.htm

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Welding Projects

Special Offers: See the latest Miller deals and promotions.