GB/T 324-2008Weld symbolic representation on drawings (English PDF)

Foreword

ISO 2553.1992 Welded, brazed and soldered joints -- Symbolic representation

on drawings (English edition) was modified and referenced in this Standard.

Compared with ISO 2553.1992, the major differences are as follows.

— Foreword of the International Standard has been removed;

— ISO 123.1982, ISO 544.1989, ISO 1302.1978, ISO 2560.1973, ISO 3098-

1.1974, ISO 3581.1976, and ISO 8167.1989 have been removed from

the normative references, and GB/T 12212-1990 has been added;

— Several supplementary symbols have been added;

— The dimensioning method has been refined;

— Some examples from the International Standard have been removed.

This Standard is the substitute for GB/T 324-1988 Weld symbolic

representation on drawings.

Compared with GB/T 324-1988, the major changes in this Standard are as

follows.

— The scope of application has been extended to brazed joints;

— 7 basic symbols have been added;

— The original "auxiliary symbols" and "supplemental symbols" are

combined into "supplemental symbols", in which a smooth blending

symbol is added; and the original backing strip is subdivided into

permanent backing strip and removable backing strip;

— The example section has been adapted to practical and concise

principles.

Annex A of this Standard is an informative annex.

This Standard was proposed by and shall be under the jurisdiction of the

National Technical Committee for Standardization of Welding.

Drafting organizations of this Standard. Harbin Welding Research Institute,

Beijing Electric Power Construction Co., Ltd, and Lanzhou LS Machinery

Equipment Co., Ltd.

Main drafters of this Standard. Piao Dongguang, Ren Yongning, and Lei

Wanqing.

Weld symbolic representation on drawings

1 Scope

This Standard specifies the rules for weld symbolic representation.

This Standard applies to the symbolic labeling of welded joints.

2 Normative references

The provisions in the following documents become the provisions of this

Standard through reference in this Standard. For dated references, the

subsequent amendments (excluding corrections) or revisions do not apply to

this Standard. However, parties who reach an agreement based on this

Standard are encouraged to study if the latest editions of these documents are

applicable. For undated references, the latest editions apply to this Standard.

GB/T 5185 Welding and allied processes -- Nomenclature of processes and

reference numbers (GB/T 5185-2005, ISO 4063.1998, IDT)

GB/T 12212 Technical drawings -- Dimensions, proportions and simplified

representation for welding symbols

GB/T 16672 Welds -- Working positions -- Definitions of angles of slope and

rotation (GB/T 16672-1996, idt ISO 6947.1993)

GB/T 19418 Arc-welded joints in steel -- Guidance on quality levels for

imperfections (GB/T 19418-2003, ISO 5817.1992, IDT)

3 General

Weld symbols are recommended when welds or joints are required on technical

drawings or documents. If necessary, it may also be indicated with the general

recommendations for technical drawings.

The symbolic representation shall clearly give all necessary indications

regarding the specific weld to be obtained without over-burdening the drawing

with notes.

Complete weld symbols include elementary symbols, leading lines,

supplementary symbols, dimension symbols and data. For simplification, the

elementary symbols and leading lines are usually only used when marking

joint", and the opposite side refers to "other side of the joint", as shown in Figure

2.

Figure 2 -- Examples of "arrow side" and "other side" of the joint