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84

WELDING PRECAUTIONS

Large voltage spikes will occur when striking an

arc during arc welding or cutting operation. These

voltage spikes can easily damage the electronic

modules in the vehicle electrical systems. The

various system used in the vehicle share chassis

ground and therefore simply disconnecting the

battery cables will not provide the protection

required. All electronic equipment must be isolated

from the vehicle chassis ground whenever

performing arc welding or cutting operation on the

vehicle.

Following precautions will minimize the

electronic module damage

Turn off the engine and disconnect the battery

negative (-) terminal before performing any work

on the vehicle.

Before staring to perform welding operation on the

body shell one should always assure that all the

ECU’s are removed.

One should not forget to disconnect all the ground

connections before performing any welding

operation.

(For ground connection details refer

A3 book of electrical section.)

Ensure welding ground clamp is of adequate size

for the welder and the clamp is as close as to the

area being welded.

Make sure that ground clamp make good

connection to the ground surface. Remove any

paints or coatings so that bare metal is exposed at

the ground point.

Ensure that the cable ground side of the clamp

makes good connection with the vehicle if using

one side ground clamp. Do not rely on the opposite

side of ground clamp to make the ground

connection.

Do not route welder electrical cables directly

across from or near any of the vehicle’s electrical

wiring harnesses.

CRUMPLE ZONE

FRONT CRUMPLE ZONE

Crumple zone is a design feature of vehicle for the

safety of passengers in case of collision. Vehicle

frame has crumple zone at the front end.

The

crumple zone,

also known as a

crush zone

,

is area of a vehicle which is designed to deform

and crumple in a collision. This absorbs some of

the energy of the impact, preventing it from being

transmitted to the occupants.

The primary function of crumple zone is to absorb

the energy from a collision and the secondary role

of slowing the actual force of a collision.

Crumple zone is designed to 'crumple' under

impact

, rather than retain their structural integrity

and therefore resist the force being applied to

them. This means that only this smaller area of the

vehicle crumples in case of collision, keeping the

passenger area intact.