Weld Access Hole on:
[Wikipedia]
[Google]
[Amazon]
The weld access hole or rat hole is a
Welds may be classified as either Complete Joint Penetration (CJP) or Partial Joint Penetration (PJP). CJP welds extend completely through the thickness of components joined. A CJP weld transmits the full load-carrying capacity of the structural components joined, and is important for
STEEL MOMENT CONNECTIONS
Structural engineering Welding {{engineering-stub
The weld access hole or rat hole is a structural engineering
Structural engineering is a sub-discipline of civil engineering in which structural engineers are trained to design the 'bones and muscles' that create the form and shape of man-made structures. Structural engineers also must understand and cal ...
technique in which a part of the web of an I-beam
An I-beam, also known as H-beam (for universal column, UC), w-beam (for "wide flange"), universal beam (UB), rolled steel joist (RSJ), or double-T (especially in Polish language, Polish, Bulgarian language, Bulgarian, Spanish language, Spanish ...
or T-beam
A T-beam (or tee beam), used in construction, is a load-bearing structure of reinforced concrete, wood or metal, with a -shaped cross section. The top of the -shaped cross section serves as a flange or compression member in resisting compress ...
is cut out at the end or ends of the beam. The hole in the web allows a welder to weld the flange
A flange is a protruded ridge, lip or rim (wheel), rim, either external or internal, that serves to increase shear strength, strength (as the flange of an iron beam (structure), beam such as an I-beam or a T-beam); for easy attachment/transfer of ...
to another part of the structure with a continuous weld the full width on both top and bottom sides of the flange. Without the weld access hole, the middle of the flange would be blocked by the web and inaccessible for welding.
The hole also minimizes 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.
The configuration adopted for web access holes affects how the beam joint will bend when under stress.
Complete penetration
Welds may be classified as either Complete Joint Penetration (CJP) or Partial Joint Penetration (PJP). CJP welds extend completely through the thickness of components joined. A CJP weld transmits the full load-carrying capacity of the structural components joined, and is important for seismic
Seismology (; from Ancient Greek σεισμός (''seismós'') meaning "earthquake" and -λογία (''-logía'') meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other ...
safety.
Complete penetration usually requires welding on both sides of a joint. Weld access holes in the web of a beam make it possible to weld both sides of a flange, making the flange joint stronger, at the expense of the web joint.
The strength of a flange joint is important, because the flange resists bending moment
In solid mechanics, a bending moment is the reaction induced in a structural element when an external force or moment is applied to the element, causing the element to bend. The most common or simplest structural element subjected to bending mome ...
of a beam.
See also
*EN 1993
En or EN may refer to:
Businesses
* Bouygues (stock symbol EN)
* Esquimalt and Nanaimo Railway (reporting mark EN, but now known as Southern Railway of Vancouver Island)
* Euronews, a news television and internet channel
Language and writing
* E ...
References
External links
STEEL MOMENT CONNECTIONS
Structural engineering Welding {{engineering-stub