GOST 23055-78

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  ГОСТ 23055-78

GOST 23055−78 nondestructive testing. Welding of metals by melting. Classification of welded joints according to the results of radiographic inspection (with Amendments No. 1, 2)

GOST 23055−78

Group B09

INTERSTATE STANDARD

Nondestructive testing

WELDING OF METALS BY MELTING

Classification of welded joints according to the results
radiographic inspection

Non-destructive testing. Fusion welding of metals.
Welds classification by radiography testing results

ISS 25.160.40

Date of introduction 1979−07−01

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 07.04.78 N 960

2. INTRODUCED FOR THE FIRST TIME

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

4. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

5. EDITION (December 2004) with Changes No. 1, 2 approved in December 1983, December 1988 (IUS 3−84, 3−89)

1. This standard applies to welded joints made by fusion welding of metals and their alloys with the thickness of the welded elements from 1 to 400 mm and sets out seven classes of welded joints on the maximum allowable size of pores, slag, tungsten and oxide inclusions are detected during radiographic testing.

The standard does not apply to a welded joint of products under Gosatomenergonadzor USSR and Gosgortekhnadzor of the USSR.

In the standard account of the requirements of GOST 6636, GOST 2601, GOST 7512, GOST 15467 and recommendations on standardisation RS 2192−72.

(Changed edition, Rev. N 2).

2. PORES AND INCLUSIONS

2.1. The size of pores, slag and tungsten inclusions accept the size of their images on the radiographs:

the diameter for spherical pores and inclusions;

the length and width for elongated pores and inclusions.

(Changed edition, Rev. N 2).

2.2, 2.2.1. (Deleted, Rev. N 1).

2.3. For the size of the clusters of pores, slag or tungsten inclusions, was adopted its length, measured on the most remote from each other the edges of the images of pores or inclusions in the cluster.

2.3.1. Called the accumulation of three or more randomly located pores, slag or tungsten inclusions with the distance between any two adjacent edges of the images of pores or inclusions more than one but not more than three of the maximum widths or diameters.

2.3, 2.3.1. (Changed edition, Rev. N 2).

2.4. The size of the oxide inclusions, lack of fusion and cracks accepted their length.

2.5. Pores or inclusions with a distance between them not more than their maximum width or diameter, regardless of their number and mutual arrangement treated as a single time or one inclusion, the dimensions of which are determined in accordance with paragraph 2.1.

(Changed edition, Rev. N 2).

2.5. (Deleted, Rev. N 2).

3. The maximum allowable length, width and the total length of pores, slag, tungsten and oxide inclusions for any stretch of telegrams with a length of 100 mm for classes 1−7 are given in table.1−7. Length of clusters should not exceed 1.5 maximum permissible length for individual defects, given in table.1−7.

Table 1

Class 1

mm

Table 2

Class 2

mm

Note to table.1 and 2. Pores and inclusions with a distance between them of not more than three of the maximum widths or diameters in classes 1 and 2 are not allowed.

Table 3

Class 3

mm

Table 4

Class 4

mm

Table 5

Class 5

mm

Table 6

Class 6

mm

Table 7

Class 7

mm

Notes to the table.1−7:

1. Pores to enable the length of the image is less than 0.2 mm in deciphering radio messages are ignored.

2. With different thickness of the welded elements the maximum size of pores or inclusions is selected by a smaller thickness.

3.1. The class of weld, the maximum allowable size of lack of penetration (in cases where lack of penetration permitted by the design or operating conditions of welded joints), as well as additional restrictions on the number and length of pores and inclusions, their total length and the distance between them should be given in the normative-technical documentation for a welded product.

3, 3.1. (Changed edition, Rev. N 2).

3.1.1. Lack of penetration in grades 1−3 are not allowed.

3.1.2. Cracks in classes 1−7 are not allowed.

3.2. When the length of the radio messages of less than 100 mm are given in table.1−7 maximum permissible total length of pores and inclusions (on any parcel dispatches a length of 100 mm) is reduced in proportion to the length of the radio messages, but should not be less than the appropriate maximum permissible length of the individual pores and inclusions.

3.2.1. In the presence of adjacent radio messages with length less than 100 mm each, and in cases when the number of pores and inclusions identified on adjacent edges of the two radio messages (for any length messages), when determining the maximum total length of pores and inclusions of these radiograms should be treated as one telegram.

3.2, 3.2.1. (Changed edition, Rev. N 2).

4. For butt and corner joints can get out of classes 1−7.

For lap and t-welded joints depending on the ratio of the smaller the thickness of the welded elements to more can get:

when the ratio of the thickness of the welded elements at least 0.8 — classes 4−7;

when the ratio of the thickness of the welded elements is less than 0.8, but not less than 0.6 classes 5−7;

when the ratio of the thickness of the welded elements less than 0.6 but not less than 0.4 classes 6−7;

when the ratio of the thickness of the welded elements is less than 0.4 but not less than 0.2 class 7.

4.1. Lap and t-welded joints with respect to the thicknesses of the welded elements is less than 0.2 radiographic method cannot be controlled.

5. Sensitivity control — according to GOST 7512. The values of sensitivity should not exceed:

for welded joints, 1st class — the values given for the 1st class of sensitivity as per GOST 7512;

for welded joints 2−4 classes — the values given for the 2nd class of sensitivity as per GOST 7512;

for welded joints in grades 5−7 — the values given for the 3rd class of sensitivity as per GOST 7512.

(Changed edition, Rev. N 1).

6. (Deleted, Rev. N 1).

ANNEXES 1, 2. (Deleted, Rev. N 1).