Weld access hole

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Weld Access Hole Sketch

The weld access hole or rat hole is a structural engineering technique that allows welding flanges of I-beams and T-beams across their full width and also minimize the induction of thermal stresses with a combination of partially releasing the welded section, avoiding welding the T section where the flange joins the web and improving cooling conditions.[1][2]

The configuration adopted for web access holes also affects the performance of moment connections due to factors such as stress concentrations.[3]

See also[edit]


  1. ^ "Ductility, Part 2: Factors That Encourage Ductility". Welding Design & Fabrication. 2007-02-28. Retrieved 2011-06-22. 
  2. ^ "AISC - Engineering FAQs". AISC. Retrieved 2011-06-22. 
  3. ^ Ricles, J.M.; Fisher, J.W. (2002). "Development of improved welded moment connections for earthquake-resistant design". Journal of Constructional Steel Research: 566–604.