Precaution For Electric Welding - Hino Motors HINO 155 series Workshop Manual

1–16 GENERAL INTRODUCTION/SAFETY INSTRUCTIONS AND READINESS TO WORK
2.

PRECAUTION FOR ELECTRIC WELDING

Electrical components such as the alternator and tachograph are directly connected to the battery and one
end is earthed to the chassis frame. Under these conditions, welding current will flow back along the earth
circuit if electric welding is carried out and damage may be caused to the alternator, tachograph, electrical
components, etc. Consequently, the following precautions are always to be taken during welding.
(1) Disconnect the earth terminal of the battery at the frame fitment and earth the welding equipment securely to the
frame itself. (Do not fit the welding equipment earth to such things as the tire rims, brake pipes or fuel pipes and
leaf spring, etc.)
a. Turn the starter switch off.
b. Disconnect the battery's negative terminal of the battery.
c. Earth welding equipment securely, near to the area to be welded.
d. Put back battery negative ground as original condition.
e. Finally check the functioning of all instruments.
Alternator
etc
ARC welding
machine
(2) In order to prevent damage to ancillary equipment components from sparks during welding, take steps such as
putting fire-resistant covers over things like the engine, meters, steering wheel, hoses, leaf spring and tires.
Computer
Battery
Chassis frame
Connect the ground of the ARC welding
machine near the place on the frame to be
welded but not connect it to plated parts such
as fuel pipes, brake pipes and leaf spring.
Disconnect the ground terminal for
battery at the connecting point on the
frame and disconnect the ground for
computer as well.
Chassis frame
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