Noobie question: stress riser

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Sorry for such a newbie question but the term stress riser keeps getting thrown around.  I've searched Google looking for a definition and haven't found much.  I'm self taught and don't know the lingo - sorry.Taking the term in context, it appears a "stress riser" is a point or area which, through welding, has created a weak point that inherent or induced stress in the metal will finally cause a break in the materiel.Is this correct?
Reply:Yes,  Any notch or crater will cause a stress concentration.  This is a primary concern when dealing with dynamic structures where the load is continually changing.  You might look at fatigue strength also.  A stress riser can be the site of cracking after millions of cycles.  Rolling stock, earth moving equipment, and processing machinery all vibrate and shake making them prone to fatigue failure.Try a google  " fatigue failure"Last edited by lotechman; 03-24-2012 at 08:44 AM.
Reply:Exaggerated contour deviations and voids are stress risers. Sudden transitions in geometry are stress risers as well.Two turn tables and a microphone.
Reply:Think of it this way for example.A sheet of glass resists cracking. But if you scribe a line with a glass cutter, it will snap right along the line. The line is the stress riser. The line is the weak spot or the "Stress Riser".Weld like a "WELDOR", not a wel-"DERR" MillerDynasty700DX,Dynasty350DX4ea,Dynasty200DX,Li  ncolnSW200-2ea.,MillerMatic350P,MillerMatic200w/spoolgun,MKCobraMig260,Lincoln SP-170T,PlasmaCam/Hypertherm1250,HFProTig2ea,MigMax1ea.
Reply:this is great - thanks all!
Reply:Originally Posted by shovelonThink of it this way for example.A sheet of glass resists cracking. But if you scribe a line with a glass cutter, it will snap right along the line. The line is the stress riser. The line is the weak spot or the "Stress Riser".