Cautions During Replacement Operations; Cautions During Welding Operations - Alfa Romeo alfa 33 Workshop Manual

2 .
Outer parts protection
.
When removing external parts (hood, back door,
moldings, finishings) it is necessary to protect body
surfaces with clothes, protection tape or other
materials, in order not to damage or scratch vehicle
body.
.
The scratched painted surfaces must be repaired: even
a slight scratch may cause corrosion.
CAUTIONS DURING
REPLACEME-NT OPERATIONS
Use genuine spare parts.
.
It is recommended always to use genuine spare parts.
This allows perfect repair and restoration of vehicle
original functioning.
CAUTIONS DURING WELDING
OPERATIONS
Spot welding
Before starting welding operations, carry out the follow-
ing checks in order to obtain welding sufficient strenght:
a) Keep the arm as short as possible in order to obtain
welding maximum pressure.
Tighten arm and tips securely so as they do not get
loose during soldering operations.
Spot welder a/m
Arm minimum
lenght
(2) Electrode alignment
Align ends of upper and lower electrodes. A misalignment
of electrodes generates insufficient pressure of soldering
points and, as consequence, an insufficient strength of
points themselves.
BODY-SHEET METAL PANELS
I
(3) Electrode end diameter
It is necessary to carefully verify diameter af electrode
ends in order to obtain the required welding strength.
Before starting working, make sure that end diameter (D)
has a value proportional to sheet thickness.
Remove burnt and foreign matters from electrode ends.
2.
If the surface of the parts to be welded presents gap, paint
film, rust or dust, this prevents welding current flow, thus
reducing soldering area and, as consequence, strength
of welding spot.
Before starting welding, verify conditions of the parts to
be welded, carrying out proper corrections.
(1) Clearance between the parts to be welded.
Presence of any clearance between surfaces to be welded,
causes reduction of current flow, The welding thus
obtained, results to be insufficient and poor in strength,
Before carrying out soldering, match the surfaces and,
when necessary, tighten them by means of a clamp.
Align both electrod-
C O R R E C T
t =Sh;thickny ,
Condition and preparation of panels to be soldered
Arm different
length
Maladjusted
electrode
length
INCORRECT
M a y 1 9 8 3