Impact Strength of Steel
Impact strength refers to the agreed -shaped specimen and is the capability of the material to withstand a suddenly applied load and is expressed in terms of energy. Therefore, a similar test rods are comparable, because the impact strength is depending on of the rod's shape.
The prior piece shape is the Charpy U- rod, a functional test of the pendulum hammer to fracture a sample. To determine the impact strength of the hammer energy losses are divided into the cross-section fraction of the surface J/cm².
Tanker weld fracture (source: http://school.mech.uwa.edu.au).
Over time, the impact strength of the steel decreases, so that the phenomenon is referred to the aging of the steel. Aging often occurs near the cracks in the weld seams. The fracture occurs sometimes after a short time of welding, sometimes a fracture occurs years later. Cracking occurs particularly in the context of poor grades of steel and has therefore taken into account the impact strength when selecting the steel.
The moderate welding qualification requires about 30 .. 40 J/cm2 impact strength - at the structure's operating temperature - the cases requiring up to 80 J/cm².
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