Miller Electric

Welding Discussion Forums

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

Results 1 to 6 of 6

Thread: contamination

  1. #1
    Join Date
    May 2008
    Posts
    13

    Default contamination

    is written that when you tig , in this case chrome moly, and you touch tung in the molten puddle ,or the filler rod goes out of the shilding gas( argon), or you don`t use a dedicate wheel when you grind the tung, or your pre and post flow is not apprppriate, contaminations occur. what consequence you are going to have in your weldings even if they show nice and well done?

  2. #2
    Join Date
    Jan 2007
    Location
    Alberta Red Deer
    Posts
    373

    Default

    the structure of the weld under the surface most likely will be compromised. IE porosity or other faults.
    trail blazer 302
    hypertherm plasma
    millermatic 251
    high feq. arc starter
    suit case (extreme 12vs)
    o/a torches
    way to many other tools to list

  3. #3
    Join Date
    Dec 2005
    Location
    wisconsin
    Posts
    836

    Default contamination

    well many things could happen,
    touching a tungsten to the molten pool can cause a splinter of tungsten to remain in the weld pool, this creates a brittle spot for a fatigue crack. Oxidation can cause inclusions of many different materials, also leading to fatigue cracks. Remember, 4130 ( if thats what your using ) is more sensitive to fatigue then mild steel. So to answer your question, the consequence is joint failure...that simple. Its up to you to decide if its ok if the joint fails.
    "Better Metalworking Through Research"

    Miller Dynasty 300DX
    Miller Dynasty 200DX
    Miller Spectrum 375 extreme
    Miller Millermatic Passport

    Miller Spot Welder
    Motor-Guard stud welder

    Smith, Meco, Oxweld , Cronatron, Harris, Victor, National, Prest-o-weld, Prest-o-lite, Marquette, Century Aircraft, Craftsman, Goss, Uniweld, Purox, Linde, Eutectic, and Dillon welding torches from 1909 to Present. (58 total)

  4. #4
    Join Date
    Jan 2007
    Location
    Alberta Red Deer
    Posts
    373

    Default

    yeah what Aerometalworker said is all true was in a hurry and had no time to write it all out.
    trail blazer 302
    hypertherm plasma
    millermatic 251
    high feq. arc starter
    suit case (extreme 12vs)
    o/a torches
    way to many other tools to list

  5. #5
    Join Date
    Nov 2007
    Posts
    184

    Default

    Aerometalworker also left out the almost instant consequence of a
    tungsten touch..................
    violent cursing followed by the urge to beat something, usually
    the side of your own head for being %&#@ dumb!
    Dave P.

  6. #6
    Join Date
    May 2008
    Posts
    13

    Default

    thanks a lot to everybody

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.