BIW Product Design

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BIW = Automobile body shell/structure are welded together Structure before painting called BIW

UnitTitle Title
Body type 1) Monocoque
2) Body on frame
Material used in BIW 1) Steel
2) Aluminum
3) Carbon fiber reinforce plastic
Design consideration 1) Aerodynamic & good appealing shape of overall BIW structure
2) BIW must be corrosion resistant & law weight
3) Sufficient space for occupant/load caring capacity
4) Overall structure stiffness & strength should be good enough to perform On road testing parameters.

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BIW structure divide in following sub structure


Underbody structure
Body side structure
Front end structure
Closures
Roofs
Fenders
Reinforcement

BIW components


Pillars – A,B,C,D
Front panels (fire wall)
Dashboard mtg. panel
Cant rail
Roof structure
Side sill
Front cross-member
Floor
Center tunnels
Front and rear wheel arch

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Type of welding in BIW (maximum used)


Spot Weld a) 2 Metal Joint
b) 3 Metal Joint
Spot weld perform with spot weld machine by melting Body panel material local Point of two OR three panel to be weld
Projection Welding This type of welding example is Nut welding on panel with weld Nut projection give in nut which melt at the time of projection welding.
Flange Heming In this type o joining main panel flange folded around another panel such as join these two pars same as welding