1 Bodyshell High Strength Steels
Most modern vehicles are constructed from a number of different steels, partly to obtain an optimised body (collision, safety,
rigidity, fuel economy, etc).
Steels are divided into several groups according to their tensile and yield strength, that is to say the force necessary to bring
about plastic deformation of the material.
Yield Summary
Yield is the strength at which the metal changes from elastic to plastic in behaviour, the point of no return.
Tensile Summary
Tensile strength is the breaking strength of a material when subjected to a tensile (stretching) force, the point of no return.
Dual Phase (DP) steel falls into both the very high strength steel (VHSS) and extra high strength steel (EHSS) classifications,
dependant on grade of DP.
Steel Type Yield Strength Mild steel (MS) Maximum yield point up to 180 MPa High strength steel (HSS) Steel with a yield point up to 280 MPa VHSS Steel with a yield point up to 380 MPa EHSS Steel with a yield point up to 800 MPa Ultra high strength steel (UHSS) Steel with a yield point greater than 800 MPa Welding Ultra High Strength Steel
UHSS requires welding equipment which can achieve the following equipment settings.
Spot Welding
Information to follow.
MIG Brazing
When mig-brazing use the following type of welder meeting the specifications shown: Fronius Trans Plus Synergic 2700 4
R/Z/AL MIG Welder, with CuSi3 (DIN 1733) 1.0mm filler wire with setting parameters 4, which is 92 Amps, Wire feed 4.6
m/min. Shielding gas L1 = pure Argon (DIN 439). Vehicle Design
