Announcement

Collapse
No announcement yet.

contamination

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • 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
    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

    Comment


    • #3
      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)

      Comment


      • #4
        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

        Comment


        • #5
          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.

          Comment


          • #6
            thanks a lot to everybody

            Comment

            Working...
            X