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  1. #1
    Join Date
    Apr 2008
    Posts
    254

    Default automotive welds

    Found these yesterday while looking at new trucks. Im assuming these were robotically done. Given the spatter I also figured they were FC of some sort. Do you agree? The main thing that surprised me was the undercut.undercut0.jpgundercut1.jpg

  2. #2
    Join Date
    Aug 2004
    Location
    Milan Michigan
    Posts
    1,677

    Default

    Thats not under cut, thats a plug weld and looks pretty normal for the application

  3. #3
    Join Date
    Apr 2008
    Posts
    254

    Default

    Sure looks undercut to me and not normal based on other welds on this truck and others on the lot. Its well out of the cut slot and that proabably is a defect as well. In the 2nd pic on the right end of the slot the weld wanders out of the slot which is clearly undercut.

  4. #4

    Default

    Looks pretty normal to me also. I worked at a car dealer body shop for 12 years.

  5. #5
    Join Date
    Dec 2012
    Location
    Memphis, TN 38133, USA, Earth, Milky Way
    Posts
    62

    Default

    Undercut or out-of-the-slot; it's still probably 3x stronger than it needs to be. Don't try to eyeball how strong it needs to be; modern finite-element-analysis in design is unbelievably accurate, which is why modern vehicles & other structures are so much lighter & stronger than previous eyeballed ones. Besides: it's under warranty. If it fails, it'll be repaired or replaced.

  6. #6
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,894

    Cool

    I doubt if its fluxcore but its robot for sure. I ran a robot doing HD parts for a while...Bob
    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

  7. #7
    Join Date
    Jun 2009
    Location
    greenfield new hampshire
    Posts
    876

    Default

    i am surprised to hear from you boys that this weld is ok and the norm, i looked at it closely, i would not let a weld like that out from my shop and i bet you guys would not either

  8. #8
    Join Date
    Apr 2008
    Posts
    254

    Default

    Quote Originally Posted by aametalmaster View Post
    I doubt if its fluxcore but its robot for sure. I ran a robot doing HD parts for a while...Bob
    OK, the reason I thought it was FC was the spatter. I figured if it was MIG that would be absent.

    Im unfamiliar w/ robotic welding but had the impression there was considerably more regularity than the welds I observed. Some looked like they had very good penetration and others appeared not to. Some were properly w/i the slot while other wandered (some considerably).

  9. #9
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    I would bet their welds are designed so not to use anymore wire than is necessary, they have a good idea of how long a vehicle is going to last before it's crushed and put on a boat and sent to China as scrap. Filling that weld to the top would be money out of their stock holders pockets.

    Forgive my double posting, my computer is supposed to be delivered today. This machine is 2000 Gateway, it's as slow as a democrat on smoke break.
    Last edited by tackit; 04-05-2013 at 07:43 AM.

  10. #10
    Join Date
    Oct 2005
    Location
    North Central Indiana
    Posts
    782

    Default

    I would bet their welds are designed so not to use anymore wire than is necessary, they have a good idea of how long a vehicle is going to last before it's crushed and put on a boat and sent to China as scrap. Filling that weld to the top would be money out of their stock holders pockets.

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