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GB/T 5336-2022 PDF in English


GB/T 5336-2022 (GB/T5336-2022, GBT 5336-2022, GBT5336-2022)
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GB/T 5336-2022: PDF in English (GBT 5336-2022)

GB/T 5336-2022
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.20
CCS R 16
Replacing GB/T 5336-2005
Technical requirements for vehicle body repair
ISSUED ON. JULY 11, 2022
IMPLEMENTED ON. NOVEMBER 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 
1 Scope... 6 
2 Normative references... 6 
3 Terms and definitions... 6 
4 General requirements... 6 
5 Process requirements... 8 
6 Completion inspection... 14 
7 Quality assurance... 15 
Appendix A (Informative) Motor vehicle body repair completion inspection record 16 
References... 18 
Technical requirements for vehicle body repair
1 Scope
This document specifies the general requirements, process requirements, completion
inspection and quality assurance for vehicle body repair.
This document applies to vehicle body repair of M2, M3 passenger vehicles and N trucks
specified in GB/T 15089.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 4780, Terms for motor vehicle body
GB 4785, Prescription for installation of the external lighting and light-signaling
devices for motor vehicles and their trailers
GB/T 5624, Motor vehicle maintenance and repair terms
GB 7258, Technical specifications for safety of power-driven vehicles operating on
roads
GB 9656, Safety technical specification for glazing materials used in power-driven
vehicles
QC/T 476, Rain Proof Performance Limit and Test Method for Bus
QC/T 484, Automobile Paint Coating
3 Terms and definitions
Terms and definitions defined in GB/T 4780 and GB/T 5624 apply to this document.
4 General requirements
4.1 Cutting
4.1.1 When cutting components that are severely deformed and difficult to correct, cold
cutting or plasma cutting should be used; oxyacetylene shall not be used for cutting
high-strength steel plates.
4.1.2 The cutting position shall be taken away from strength support points and stress
concentration areas. Where there is a cutting line mark, the cutting shall be performed
along the mark.
4.2 Welding and bonding
4.2.1 Before welding, the oil, rust and coating on the surface of the plate shall be
removed, and the steel plate inside the weld shall be subjected to the anti-rust treatment.
4.2.2 The appropriate welding method shall be selected according to the type and
structural characteristics of the material and with reference to the technical information
of vehicle repair disclosed by the motor vehicle manufacturer.
4.2.3 For the welding of aluminum products, argon arc welding or inert gas shielded
welding shall be used, and the reverse welding method shall be adopted. For vertical
welding, it shall be performed from bottom to top.
4.2.4 The surface of welding seam and welding point shall be smooth and uniform, and
there shall be no welding defects such as welding penetration, desoldering, welding
leakage and slag inclusion.
4.2.5 Structural parts such as the vehicle body frame shall be inspected with a flaw
detector to check the welding parts, and the welds shall be free of cracks.
4.2.6 The driver’s seat shall not be fixed and repaired by welding; the leaf spring support,
the lifting lug seat and the frame shall not be welded together.
4.2.7 After welding, anti-corrosion and anti-rust treatment shall be carried out on the
welding and exposed parts.
4.2.8 Parts with bonding requirements shall be carried out in accordance with the
requirements of automobile maintenance technical information disclosed by the
automobile manufacturer.
4.3 Riveting
4.3.1 The riveting shall be solid and firm; all rivets shall be flat and fastened, neatly
arranged, and evenly spaced.
4.3.2 The rivet head shall be free of phenomena such as damage, deflection, crush injury,
incomplete head.
4.4 Bolting
5.1.6 The upper planes of the left and right longitudinal beams of the frame assembly
shall be in the same plane, and the flatness tolerance shall be 0.15% of the length of the
measured plane.
5.1.7 The perpendicularity of the side of the longitudinal beam of the frame to the upper
plane of the frame shall not be greater than 1% of the height of the longitudinal beam;
the perpendicularity of the main beam to the longitudinal beam shall not be greater than
0.20% of the length of the beam.
5.1.8 For the check of the frame segment (front leaf spring front bracket pin hole axis -
front leaf spring rear bracket pin hole axis - rear leaf spring front bracket pin hole axis
- rear leaf spring rear bracket pin hole axis), the difference in the length of the diagonal
lines of each segment shall not be greater than 5 mm, and the distance between the
intersection of the diagonal lines and the center line of the frame shall not be greater
than 2 mm.
5.1.9 Where the corroded area of the lower end of the vehicle body pillar reaches more
than 1/3 of its total area, the local corroded part shall be cut off and replaced.
5.1.10 Both the distance between the vehicle body pillars and the distance between the
adjacent frames on both sides shall meet the requirements of automobile maintenance
technical information which is disclosed by the automobile manufacturer.
5.1.11 The radian of the roof beam shall be the same as the original shape and shall be
bilaterally symmetrical.
5.1.12 After the framework is reshaped, the shape shall be flat and the curved surface
connection and change shall be even. The lower edge of the side window and the floor
lining shall be checked with a sample plate, and the tolerance value of the surface profile
shall be 4 mm.
5.1.13 The difference in the diagonal length of the frame in the cross-section of the
vehicle body shall not be greater than 8 mm.
5.1.14 The difference in the diagonal length of the passenger door frame shall not
exceed 4 mm, or shall be measured with a special inspection tool; the tolerance shall
meet the requirements of automobile maintenance technical information disclosed by
the automobile manufacturer.
5.1.15 The driver's door frame shall be checked with a template, and the tolerance value
of its line profile shall be 4 mm.
5.1.16 After the front and rear windshield window frames are reshaped, the shape, size,
seam allowance radian, and seam allowance depth shall comply with the requirements
of automobile maintenance technical information disclosed by the automobile
manufacturer. The seam allowance radian shall be checked with a template, and the
tolerance value of its surface profile shall be 4 mm.
5.1.17 The windshield window frame without framework is allowed to be excavated
and repaired in sections, which shall be inspected in accordance with the provisions of
5.1.16.
5.1.18 The difference in the diagonal length of the side window frame shall not be
greater than 3 mm.
5.2 Inner and outer skins and trims
5.2.1 The outer skin of the vehicle body shall be smooth in appearance, and the outer
curved surface shall have a uniform transition, without cracks or serious corrosion.
5.2.2 The following requirements shall be met when replacing the outer skin.
a) The outer skin shall be subjected to prestressed stretching and rust removal, anti-
rust and anti-corrosion treatment in accordance with the requirements of
automobile maintenance technical information disclosed by the automobile
manufacturer;
b) For outer skin with reinforced fold lines, the fold lines shall be flush and consistent;
c) The inner surface of the outer skin perimeter shall be closely attached to the pillar
frame and the lining plate, and shall be treated with heat and sound insulation.
5.2.3 The skin rivets shall be arranged flatly and neatly, and spaced uniformly; the
position tolerance value shall be ϕ4 mm.
5.2.4 The outer decorative tape and the skin shall be fitted well, straightly and smoothly;
the segmented joints shall be flush; the joint gap shall not be greater than 0.50 mm.
5.2.5 The inner skin (hoarding) shall be free from cracks and warping. The soft inner
canopy shall be free from wrinkle, slack and breakage.
5.2.6 The fire-resistant properties of interior materials shall meet the requirements of
GB 7258.
5.2.7 The appearance of interior trim panels and interior and exterior trim parts shall be
smooth and fit, the curved surfaces shall transition evenly, and the surface shall be free
of convex and concave deformation, cracks, wrinkles, scratches, etc. The surface profile
tolerance value of interior trim panels shall be 1.5 mm. The trim strip and each plate
shall be closely connected; the fasteners shall be neatly arranged.
5.2.8 The local cracks of glass fiber-reinforced plastic parts should be repaired with
FRP materials.
5.2.9 Electroplated trims and stainless-steel parts shall be free of rust spots,
delamination, unevenness and scratches.
5.4.1.5 The bumper and radiator cover shall be reliable and installed firmly.
5.4.1.6 The fuel tank shall be installed firmly; there shall be pads between the brackets,
clamps and the fuel tank, and there shall be no friction or collision.
5.4.1.7 The number, installation position and fixing point strength of the seat belt shall
meet the requirements of automobile maintenance technical information disclosed by
the automobile manufacturer.
5.4.2 Electrical appliances
5.4.2.1 The installation of electrical equipment and lines shall comply with the
requirements of automobile maintenance technical information disclosed by the
automobile manufacturer; the installation shall be firm.
5.4.2.2 Electrical equipment such as instruments, audio-visual devices, signal
monitoring devices, alarm devices and various adjustment and control devices shall be
complete and intact, installed firmly and work effectively.
5.4.2.3 The insulation layer on the outer surface of the wiring harness shall be free of
aging and damage; the wiring harness shall be installed firmly and reliably, and there
shall be protective devices at the holes passing through.
5.5 Additional requirements
5.5.1 The floor shall be installed tightly, arranged evenly, with a smooth surface and no
cracks. It shall not have interference with the operating parts; dust covers or dust pads
shall be provided at the perforations of each operating mechanism and the floor.
5.5.2 Openable doors and windows shall open and close easily, close tightly, lock
reliably, with even gaps and not loose; glass lifters and door handles shall be complete,
lift or open smoothly; the stroke shall conform to the requirements of automobile
maintenance technical information which is disclosed by the automobile manufacturer,
and the work shall be reliable without abnormal noise; the electric anti-pinch device
shall be complete and effective.
5.5.3 The door pump support plate shall be installed firmly; the cover shall not be
warped; the hinge shall rotate flexibly; it shall not vibrate after locking. The door-pump
linkage shall move softly.
5.5.4 Handrails and brackets (including tee-junction) shall be free of rust, bending and
loosening, and the surface shall be smooth.
5.5.5 The luggage compartment shall maintain the original technical structure; the door
shall be free from warping and deformation, close tightly, open and close flexibly, and
lock reliably.
5.5.6 The engine compartment door (cover) shall be free from cracks, deformation, and
shall be tightly covered; the accessories shall be complete and effective, flexible and
reliable, and firmly supported.
5.5.7 The articulated vehicle body articulating device and connecting mechanism shall
be firm and flexible; the cross shaft and the ball stud of the articulating mechanism shall
be inspected for flaw detection; each matching part shall meet the requirements of
automobile maintenance technical information disclosed by the automobile
manufacturer.
5.5.8 The safety device of the articulating mechanism shall meet the requirements of
automobile maintenance technical information disclosed by the automobile
manufacturer. The semicircular plate shall be free from warping, corrosion and serious
wear; the maximum gap between the semicircular plate and the moon-shaped rotating
guard plate shall not be greater than 6 mm.
5.5.9 The canopy bone shall be free from rust, fracture and distortion. The retractable
canopy shall be replaced with a new one, and the installation shall be firm. Dust-proof
devices shall be complete; gas spring installation shall be moderate and reliable, and
anti-rust and dust-proof measures shall be provided.
5.5.10 The ventilation device and safety top window shall be installed firmly, and shall
meet the requirements of automobile maintenance technical information disclosed by
the automobile manufacturer.
5.5.11 The pipe joints of the air-conditioning system shall be free of leakage; the
condenser shall be clean and unobstructed; the air duct structure and air outlet shall
meet the requirements of automobile maintenance technical information disclosed by
the automobile manufacturer.
5.6 Special requirements for trucks
5.6.1 Where the cab assembly adopts a turning mechanism, there shall be no abnormal
noise during driving, and the vibration reduction shall be effective; the turning shall be
light and flexible, and the turning angle shall meet the requirements of automobile
maintenance technical information disclosed by the automobile manufacturer; the
positioning and locking mechanism shall be reliable, complete, and efficient.
5.6.2 The offset of the cab and the cargo box installed on the frame to the center line of
the frame shall be less than 10 mm; the connection between the cab, cargo box, body
and the frame shall be tight, safe and reliable.
5.6.3 The frame of the cargo box shall be straight, free from breakage and deformation,
and the movable side panels and rear panels shall be free to open and close and reliable
to lock.
6.4.2 The quantity and location of external lighting shall comply with the provisions of
GB 4785.
6.5 Tightness
The rainproof performance of the repaired vehicle body shall meet the requirements of
QC/T 476.
6.6 Doors and windows
6.6.1 The glass of doors and windows shall be made of safety glass and comply with
the provisions of GB 9656.
6.6.2 The safety top windows and safety doors shall be complete and shall open and
close flexibly.
6.6.3 The emergency door and emergency window shall be easy to open, and the size
and quantity shall meet the requirements of automobile maintenance technical
information disclosed by the automobile manufacturer.
6.6.4 The window glass shall be clean, intact, and free from looseness. The openable
window shall be flexibly opened and closed, and the locking shall be reliable. The
stroke shall meet the requirements of automobile maintenance technical information
disclosed by the automobile manufacturer.
7 Quality assurance
7.1 A completion inspection shall be carried out after the repair of the vehicle body; the
inspection record is shown in Appendix A.
7.2 The quality guarantee period of the finished vehicle body repair shall be calculated
from the date of completion of the repair and leave the factory, and shall not be less
than 20 000 km or 100 d of vehicle driving, whichever comes first.
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.