GOST 23055-78 PDF

Full title and description

GOST 23055-78 — Nondestructive testing. Fusion welding of metals. Classification of welded joints according to the results of radiographic inspection. (Original Russian title: Контроль неразрушающий. Сварка металлов плавлением. Классификация сварных соединений по результатам радиографического контроля.)

Abstract

This standard establishes radiographic acceptance classes for welded joints made by fusion welding of metals and alloys. It defines seven classes based on maximum allowable sizes and types of discontinuities (pores, slag, tungsten and oxide inclusions, etc.) detected by radiographic inspection for joint thicknesses from 1 mm to 400 mm. The standard includes normative references and was issued as an interstate (GOST) document introduced in 1979 with later amendments.

General information

• Status: Active / in force (interstate GOST — limitation of action removed by protocol; standard currently listed as действующий).
• Publication date: Introduced 1 July 1979 (designation year 1978 — GOST 23055-78; date of entry into force 1979-07-01).
• Publisher: Interstate standard (GOST) — originally approved by the USSR State Committee for Standards (Gosstandart) and maintained as an interstate technical standard.
• ICS / categories: ICS/OKS: 25.160.40 (nondestructive testing / radiographic inspection); group B09.
• Edition / version: GOST 23055-78 (original edition 1978/introduced 1979) with Amendments published in 1983 and 1988 (commonly referenced as Changes No.1 and No.2 / IUS 3-84, 3-89).
• Number of pages: 8 pages (typical published text length in common repositories and catalogs).

Scope

Applies to welded joints produced by fusion welding of metals and their alloys with overall welded-element thicknesses from 1 mm up to 400 mm. The standard sets radiographic acceptance classes and limits the maximum permissible sizes of discontinuities (pores, slag, tungsten and oxide inclusions, etc.) used to classify weld quality. It does not apply to certain categories of products subject to specific oversight by state regulatory organs referenced in the USSR-era text (for example, Gosatomenergonadzor and Gosgortekhnadzor as noted in the original document). The standard references and depends on other GOST normative documents for definitions and measurement methods.

Key topics and requirements

• Classification scheme of welded joints into seven radiographic classes according to maximum allowable discontinuity size and type revealed by radiography.
• Radiographic acceptance criteria addressing pores, slag inclusions, tungsten and oxide inclusions, and related discontinuities.
• Application limits by weld element thickness (1–400 mm) and by weld type made by fusion welding processes.
• Normative references to related GOSTs that define radiographic technique, defect notation and measurement methods.
• Exclusions for specific regulated product categories under separate supervisory bodies (as specified in the original text).

Typical use and users

Used by nondestructive testing (NDT) specialists, radiographic inspectors, welding engineers, quality and conformity assessment personnel, fabricators and manufacturers in sectors using fusion welding (machinery, pipework, pressure equipment, shipbuilding, structural steelwork). Also used by standardization and certification bodies when assessing weld quality against radiographic acceptance classes.

Related standards

GOST 23055-78 references and is commonly used alongside GOSTs covering radiographic technique, defect classification and welding terminology — for example GOST 2601, GOST 6636, GOST 7512, GOST 15467 (as cited in the standard). Internationally, similar subject-matter is addressed by ISO standards on weld imperfections and radiographic testing (for example ISO 5817 and ISO 17636), which can be used for cross-reference in multinational projects.

Keywords

GOST 23055-78, radiographic inspection, nondestructive testing, NDT, fusion welding, weld classification, weld acceptance, pores, slag inclusions, weld discontinuities, radiography, weld quality.

FAQ

Q: What is this standard?

A: GOST 23055-78 is an interstate (GOST) standard that defines radiographic classification and acceptance criteria for welded joints made by fusion welding, establishing seven classes based on maximum allowable radiographically detected discontinuities.

Q: What does it cover?

A: It covers radiographic acceptance criteria for welds (pores, slag, tungsten/oxide inclusions and similar defects), applies to welded element thicknesses from 1 mm to 400 mm, and sets limits that determine weld class. It cites related GOST normative documents for test methods and definitions.

Q: Who typically uses it?

A: NDT/radiography inspectors, welding and quality engineers, fabricators, certification bodies and regulators involved in inspection and acceptance of fusion-welded joints.

Q: Is it current or superseded?

A: The standard is listed as действующий (in force) in common standards catalogs; it was introduced in 1979 and has recorded amendments published in the 1980s. Users should verify the latest status and any additional national/regulatory overrides before application in safety-critical contexts.

Q: Is it part of a series?

A: It forms part of the GOST family of nondestructive testing and welding standards and is typically used together with referenced GOSTs that define radiographic methods, defect notation and welding terminology; it is not a numbered series by itself but sits within the NDT/welding normative set.

Q: What are the key keywords?

A: Radiographic inspection, weld classification, nondestructive testing, fusion welding, defects (pores, slag, inclusions), acceptance criteria, GOST 23055-78.