GB/T 19804-2005Welding -- General tolerances for welded constructions -- Dimensions for lengths and angles -- Shape and position (English PDF)

Foreword

This Standard is identical to the international standard ISO 13920.1996

"Welding - General tolerances for welded constructions - Dimensions for

lengths and angles - Shape and position" (English version). To ensure the

applicability and coordination of the standard, this Standard, in the process of

equivalent conversion of ISO 13920, combined with the actual situations of

China, has made necessary treatment. For the references, the referenced ISO

standards are changed to the corresponding national standards in China.

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee

55 on Welding of Standardization Administration of China.

Responsible drafting organization of this Standard. Harbin Welding Institute.

Main drafter of this Standard. Piao Dongguang.

Welding - General tolerances for welded constructions -

Dimensions for lengths and angles - Shape and position

1 Scope

This Standard specifies general tolerances for linear and angular dimensions

and for shape and position of welded structures in four tolerance classes, these

being based on customary workshop accuracy. The selection of a particular

tolerance class shall meet the actual needs.

General tolerances for linear and angular dimensions and for shape and

position as specified in this Standard apply for weldments, welding assemblies

and welded structures etc.. Special provisions may be necessary for complex

structures.

The specifications given in this Standard are based on the principle of

independency as specified in GB/T 4249, according to which the dimensional

and geometrical tolerances apply independently of each other.

Manufacturing documentation in which linear and angular dimensions or

indications for shape and position are presented without individually indicated

tolerances shall be deemed incomplete if there is no, or inadequate, reference

to general tolerances. This does not apply to temporary dimensions.

2 Normative references

The clauses in the following documents, by reference in this Standard,

constitute the clauses of this Standard. For the dated references, the

subsequent amendments (not including errata content) or revisions do not

apply to this Standard. However, parties which have reached an agreement

according to this Standard are encouraged to study whether the latest version

of these documents can be used. For the undated references, the latest version

is applicable to this Standard.

GB/T 1182 Product Geometric Specification (GPS) - Geometric Tolerance -

Shape, Direction, Position, and Runout Tolerance (eqv ISO 1101.1996)

GB/T 1214.1 The specification for calipers of vernier type

GB/T 1214.2 The vernier calipers for calipers of vernier type

......