Infiniti G37 Coupe. Manual - part 290

 

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Infiniti G37 Coupe. Manual - part 290

 

 

REPAIRING HIGH STRENGTH STEEL

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• 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.

• The spot weld on HSS panels is harder than that of an ordi-

nary 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.

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< REMOVAL AND INSTALLATION >

REPAIRING HIGH STRENGTH STEEL

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

gaps.

• Follow the specifications for the proper welding pitch.

Unit: mm (in)

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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 over
12 (0.47) or over
18 (0.71) or over
20 (0.79) or over
27 (1.06) or over
31 (1.22) or over

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REPLACEMENT OPERATIONS

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REPLACEMENT OPERATIONS

Description

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• This section is prepared for technicians who have attained a high level of skill and experience in repairing

collision-damaged vehicles and also use modern service tools and equipment. Persons unfamiliar with body
repair techniques should not attempt to repair collision-damaged vehicles by using this section.

• Technicians are also encouraged to read Body Repair Manual (Fundamentals) in order to ensure that the

original functions and quality of the vehicle can be maintained. The Body Repair Manual (Fundamentals)
contains additional information, including cautions and warning, that are not including in this manual. Techni-
cians should refer to both manuals to ensure proper repairs.

• Please note that these information are prepared for worldwide usage, and as such, certain procedures might

not apply in some regions or countries.

The symbols used in this section for welding operations are shown below.

Symbol marks

Description

2-spot welds

3-spot welds

MIG plug weld

For 3 panels plug weld method

MIG seam weld / Point weld

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REPLACEMENT OPERATIONS

• Front pillar butt joint can be determined anywhere within shaded

area as shown in the figure. The best location for the butt joint is at
position A due to the construction of the vehicle. Refer to the front
pillar section.

• Determine cutting position and record distance from the locating

indent. Use this distance when cutting the service part. Cut outer
front pillar over 60 mm (2.36 in) above inner front pillar cut position.

• Prepare a cutting jig to make outer pillar easier to cut. Also, this will

permit service part to be accurately cut at joint position.

• An example of cutting operation using a cutting jig is as follows.
1.

Mark cutting lines.
A: Cut position of outer pillar
B: Cut position of inner pillar

2.

Align cutting line with notch on jig. Clamp jig to pillar.

3.

Cut outer pillar along groove of jig (at position A).

4.

Remove jig and cut remaining portions.

5.

Cut inner pillar at position B in same manner.

REAR FENDER HEMMING PROCESS

1.

A wheel arch is to be installed and hemmed over left and right outer wheel house.

2.

In order to hem the wheel arch, it is necessary to repair any damaged or defaced parts around outer
wheel house.

CAUTION:

Ensure that the area that is to be glued around outer wheelhouse is undamaged or defaced.

Procedure of the hemming process

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