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Nissan Leaf. Manual - part 346

BRM-8

< PRECAUTION >

REPAIRING HIGH STRENGTH STEEL

REPAIRING HIGH STRENGTH STEEL

High Strength Steel (HSS)

INFOID:0000000010121681

High strength steel is used for body panels in order to reduce vehicle weight.

Accordingly, precautions in repairing automotive bodies made of high strength steel are described below:

Read the following precautions when repairing HSS:

Tensile strength

Major applicable parts

440 - 780 MPa

• Rear side member closing plate
• Trans control reinforcement

(Center front floor component part)

• Rear side member front extension

(Front floor component part)

• Front floor front

(Front floor component part)

• 2nd crossmember

(Front floor component part)

• 3rd crossmember

(Front floor component part)

• Inner sill reinforcement

(Inner sill component part)

• Side dash
• Front suspension spring support

(Front strut housing component part)

• Front side member front assembly
• Front side member assembly
• Front side member closing plate assembly
• Rear seat crossmember
• Rear crossmember center assembly
• Rear side member
• Rear side member extension reinforcement assembly
• Rear side member extension
• Inner side roof rail
• Upper inner front pillar
• Front pillar brace
• Lower center pillar brace
• Outer sill reinforcement
• Inner rear pillar reinforcement
• Lower rear panel reinforcement

(Upper rear panel component part)

• Front roof rail (Lower)

(Front roof rail component part)

• Roof member reinforcement

(Center roof reinforcement component part)

980 MPa

• Front side member center extension

(Front floor component part)

• Front side member rear extension

(Front floor component part)

• Inner sill
• Inner front sill reinforcement (Upper & Lower)

(Inner sill component part)

• Lower dash crossmember (Upper RH & LH)

(Lower dash component part)

• Lower dash crossmember (Lower)
• Center pillar seat belt anchor

(Inner center pillar assembly component part)

• Inner center pillar assembly (Upper side)
• Outer side roof rail reinforcement
• Center pillar reinforcement

(Lower center pillar brace component part)

• Front roof rail reinforcement

(Front roof rail component part)

REPAIRING HIGH STRENGTH STEEL

BRM-9

< PRECAUTION >

BRM

1. Additional points to consider

• The repair of reinforcements (such as side members) by heat-

ing is not recommended, because it may weaken the compo-

nent. When heating is unavoidable, never heat HSS parts

above 550

°C (1,022°F).

Verify heating temperature with a thermometer.

(Crayon-type and other similar type thermometer are appropri-

ate.)

• When straightening body panels, use caution in pulling any

HSS panel. Because HSS is very strong, pulling may cause

deformation in adjacent sections of the body. In this case,

increase the number of measuring points, and carefully pull

the HSS panel.

• When cutting HSS panels, avoid gas (torch) cutting if possible.

Instead, use a saw to avoid weakening surrounding areas due

to heat. If gas (torch) cutting is unavoidable, allow a minimum

margin of 50 mm (1.97in).

• When welding HSS panels, use spot welding whenever possi-

ble in order to minimize weakening surrounding areas due to

heat.

If spot welding is impossible, use MIG. welding. Do not use

gas (torch) for welding because it is inferior in welding

strength.

PIIA0115E

PIIA0116E

PIIA0117E

JSKIA0082GB

BRM-10

< PRECAUTION >

REPAIRING HIGH STRENGTH STEEL

• Spot welding on HSS panels is harder than that of an ordinary

steel panel.

Therefore, when cutting spot welds on a HSS panel, use a low

speed high torque drill (1,000 to 1,200 rpm) to increase drill bit

durability and facilitate the operation.

2. Precautions in spot welding HSS

This work should be performed under standard working condi-

tions. Always note the following when spot welding HSS:

• The electrode tip diameter must be sized properly according to

the metal thickness.

• The panel surfaces must fit flush to each other, leaving no

gaps.

• Follow the specifications for the proper welding pitch.

Unit: mm (in)

Handling of Ultra High Strength Steel Plate Parts

INFOID:0000000010121682

PROHIBITION OF CUT AND CONNECTION

Never cut and Joint the stiffener front side member (front floor inside frame parts) because its material is high

strength steel plate (ultra high strength steel plate).

The front floor assembly must be replaced if this part is damaged.

PIIA0145E

PIIA0146E

PIIA0147E

Thickness (T)

Minimum pitch (L)

0.6 (0.024)
0.8 (0.031)
1.0 (0.039)
1.2 (0.047)
1.6 (0.063)
1.8 (0.071)

10 (0.39) or more
12 (0.47) or more
18 (0.71) or more
20 (0.79) or more
27 (1.06) or more
31 (1.22) or more

JSKIA0781ZZ

PAINTING BOOTH

BRM-11

< PRECAUTION >

BRM

PAINTING BOOTH

Criteria for Battery Removal When Drying Painting

INFOID:0000000010121683

To use painting booth, maintain outer sill (A) temperature at 60

°C (140°F) or less to prevent deterioration in li-

ion battery.

NOTE:

• Measure the temperature with a noncontact thermometer.

• If a sill cover (resin) is included, remove the sill cover to measure the temperature.

If outer sill (A) temperature is more than 60

°C (140°F), remove li-ion battery beforehand and place in the paint-

ing booth.Refer to

EVB-188, "Inspection"

Outer sill temperature measurement part

JSKIA2340ZZ

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