QC/T 29087-2023 English PDF (QCT29087-2023)

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QC/T 29087-2023: Permissible welding variation in dimensions without tolerance indication
QC/T 29087-2023
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
CCS T 33
Replacing QC/T 29087-1992
Permissible welding variation in dimensions without
tolerance indication
ISSUED ON: APRIL 21, 2023
IMPLEMENTED ON: NOVEMBER 01, 2023
Issued by: Ministry of Industry and Information Technology of the PRC
Table of Contents
Foreword ... 6
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 7
4 Limit deviation of dimension without tolerance indication in automobile sheet metal
welding processing ... 8
5 Limit deviation of the dimensions without tolerance indication after welding of nuts
and studs ... 9
6 Limit deviation of gas shielded welding dimensions without tolerance indications 10
7 Limit deviation of profile welding structure without tolerance indications ... 11
8 Drawing representation of unindicated limit deviation ... 11
Foreword
This document was drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1: Rules for the structure and drafting of
standardizing documents".
This document replaces QC/T 29087-1992. Compared with QC/T 29087-1992, in
addition to editorial changes, the main technical changes are as follows:
- ADD relevant terms and definitions (see Chapter 3):
- ADD the classification of common lap joints for automotive sheet metal parts, flat
lap joints, lap joints with flanges (see Chapter 4):
- ADD the limit deviation requirements of welding dimensions without tolerance
indications corresponding to different lap joints of automotive sheet metal parts
(see Chapter 4);
- ADD the limit deviation requirements for welding dimensions without tolerance
indications for nuts and studs (see Chapter 5):
- ADD the limit deviation requirements for dimensions without tolerance indications
for profile welding structures (see Chapter 7);
- DELETE the limit deviation of angles without tolerance indications (see 2.2 of the
1992 edition).
Please note that some of the contents of this document may involve patents. The issuing
agency of this document does not assume the responsibility for identifying patents.
This document was proposed by AND shall be under the jurisdiction of the National
Technical Committee for Automobile Standardization (SAC/TC 114).
The drafting organization of this document: Beijing Automotive Co., Ltd.
The main drafters of this document: Pan Qiang, Wang Qian.
This standard replaces the standard previously issued as follows:
- It was first published in 1992 as QC/T 29087-1992;
- This is the first revision.
Permissible welding variation in dimensions without
tolerance indication
1 Scope
This document specifies the limit deviations of dimension without tolerance indications
in automotive parts affected by welding processes.
This document applies to the limit deviations of dimensions and angles without
tolerance indications of automotive sheet metal parts and profiles formed after welding.
This document does not apply to weldment dimensions and weld dimensions which are
checked according to the main model.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated references,
only the version corresponding to that date applies to this document; for undated
references, the latest version (including all amendments) applies to this document.
GB/T 1800.1 Geometrical product specifications (GPS) - ISO code system for
tolerances on linear sizes - Part 1: Basis of tolerances, deviations and fits
GB/T 3375 Welding terminology
GB/T 19804 Welding - General tolerances for welded constructions - Dimensions
for lengths and angles - Shape and position
QC/T 266 Extreme deviation for undeclared tolerance size of automobile parts -
General requirements
3 Terms and definitions
The terms and definitions defined in GB/T 1800.1, GB/T 3375, GB/T 19804, QC/T 266,
as well as the following terms and definitions, apply to this document.
3.1
Flanging