QC/T 29087-2023Limit deviations of untoleranced dimensions for automotive welded parts (English PDF)

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).

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. […]