Welded seams according to GOST 14771 76. Welding of fittings GOST - semi-automatic welding

5. When making the root of a multilayer weld by a welding method different from the main method by which the groove is filled, the values ​​of the structural elements of the welded joint must be selected according to the main welding method. In this case, the designation of the welding method should be made in shot, in the numerator of which the designation of the method of welding the root of the seam is given, and in the denominator - the designation of the main welding method.

6. For welded joints C12, C21, C23, C24, U7, U10, T7, having a thickness of parts s= 12 mm or more, as well as for connections C15, C16, C25, C27, U8, T8, having a thickness of parts s= 20 mm and more, performed by the UE welding method, blunting is allowed With= 5 ± 2 mm.

Crap. 2.

Crap. 3.

8. Size and limit deviations of the leg of the fillet weld To and K 1 must be set during design. In this case, the size of the leg should be no more than 3 mm for parts up to 3 mm thick inclusive and 1.2 thicknesses of a thinner part when welding parts with a thickness of more than 3 mm. Limit deviations of the size of the leg of the fillet welds from the nominal value are given in.

9. (Deleted, Rev. No. 1).

10. (Deleted, Rev. No. 3).

11. Convexity or concavity of the fillet weld is allowed up to 30% of its leg, but not more than 3 mm. In this case, the concavity should not lead to a decrease in the value of the leg K p(Fig. 4) installed during the design.

Crap. four .

Note. leg To nis the leg of the largest right triangle inscribed in the outer part of the fillet weld. With a symmetrical seam for the leg To nany of the equal legs is accepted, with an asymmetrical seam - a smaller one.

(Revised edition, Rev. No. 3).

12. Before welding, the displacement of the edges relative to each other is allowed no more than:

0,2s mm - for parts up to 4 mm thick;

0,1s+ 0.5 mm - for parts with a thickness of 5 - 25 mm;

3 mm - for parts with a thickness of 25 - 50 mm;

0,04s+ 1.0 mm - for parts with a thickness of 50 - 100 mm;

0,01s+ 4.0 mm, but not more than 6 mm - for parts with a thickness of more than 100 mm.

14. The minimum values ​​​​of the legs of the fillet welds are given in.

15. When using welding in carbon dioxide instead of manual arc welding, the leg of the design fillet weld can be reduced to the values ​​\u200b\u200bgiven in.

16. When welding in carbon dioxide with an electrode wire that provides a weld metal with a higher tensile strength than that of the base metal, the leg of the design fillet weld can be reduced to the values ​​\u200b\u200bgiven in the recommended one.

14 - 16. (Introduced additionally, Amendment No. 1).

17. In butt, tee and corner joints with a thickness of more than 16 mm, performed under installation conditions, it is allowed to increase the nominal value of the size b up to 4 mm. In this case, the width of the seam can be increased accordingly. e, e 1 .

18. It is allowed in places where welds overlap and in places where defects are corrected, an increase in the size of the welds up to 30% of the nominal value.

19. When preparing edges using a hand tool, the maximum deviations of the bevel angle of the edges can be increased up to ± 5 °. In this case, the width of the seam can be changed accordingly. e, e 1 .

17 - 19. (Introduced additionally, Amendment No. 3).

mm

Note . The minimum leg value must not exceed 1.2 times the thickness of the thinner element.

mm

Note . The given data does not apply to connections made when welding on an extended electrode stick-out or on a direct current polarity.

(Introduced additionally, Amendment No. 1).

mm

(Introduced additionally, Amendment No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the research and production association TsNIITMASH.

PERFORMERS

M. M. Borisenko(topic leader); V. D. Khodakov; E. G. Starchenko.

2. APPROVED AND INTRODUCED BY Decree of the State Committee for Standards of the Council of Ministers of the USSR dated July 28, 1976 No. 1826.

3. Term of inspection 1990. Periodicity of inspection is 5 years.

4. Standard conformTGL 14905/03 regarding the form and content of tables of welded joints.

5. REPLACE GOST 14771-69.

6. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS.

7. REPUBLICATION with Amendments No. 1, 2, 3, approved in March 1982, December 1986, January 1989 (IUS 6-82, 3-87, 4-89).

This standard specifies the main types, structural elements and dimensions of welded joints made of steels, as well as alloys on iron-nickel and nickel bases, performed by gas-shielded arc welding.
The standard does not establish the main types, structural elements and dimensions of welded joints of steel pipelines in accordance with GOST 16037-80

Title of the document:	GOST 14771-76
Document type:	standard
Document status:	current
Russian name:	Arc welding in shielding gas. Connections are welded. Main types, structural elements and dimensions
English name:	Gas-shielded arc welding. Welded joints. Main types, design elements and dimensions
Text update date:	01.08.2013
Introduction date:	30.06.1977
Description update date:	01.08.2013
Number of pages in the main text of the document:	39 pcs.
Instead:	GOST 14771-69
Publication date:	01.12.2006
Reissue:	reissue with rev. one
Last Modified Date:	22.05.2013
Amendments and changes:	Amendment No. 1 to GOST 14771-76 (1982-08-01) - "Validity period extended" Amendment No. 2 to GOST 14771-76 (1987-07-01) - "Validity period extended" Amendment No. 3 to GOST 14771-76 (1989-03-01) - "Validity period extended"
Located in:	OKS All-Russian classifier of standards 25 ENGINEERING (This area includes general purpose standards) 25.160 Welding, brazing and soldering (Including gas welding, electric welding, plasma welding, electron beam welding, plasma cutting, etc.) 25.160.40 Welds and welds (Including weld position and non-destructive mechanical testing of welds)

5. When making the root of a multilayer weld by a welding method different from the main method by which the groove is filled, the values ​​of the structural elements of the welded joint must be selected according to the main welding method. In this case, the designation of the welding method should be made in shot, in the numerator of which the designation of the method of welding the root of the seam is given, and in the denominator - the designation of the main welding method.

6. For welded joints C12, C21, C23, C24, U7, U10, T7, having a thickness of parts s= 12 mm or more, as well as for connections C15, C16, C25, C27, U8, T8, having a thickness of parts s= 20 mm and more, performed by the UE welding method, blunting is allowed With= 5 ± 2 mm.

Table 48

7. Butt welding of parts of unequal thickness in case of a difference in thickness not exceeding the values ​​\u200b\u200bspecified in Table. 48, should be produced in the same way as parts of the same thickness; the structural elements of the prepared edges and the dimensions of the weld should be selected according to the greater thickness.

To make a smooth transition from one part to another, an inclined arrangement of the weld surface is allowed (Fig. 1).

With a difference in the thickness of the parts to be welded above the values ​​\u200b\u200bspecified in Table. 48, on a part having a large thickness s 1 beveled on one or both sides to the thickness of the thin piece s as indicated in hell. 2 and 3. In this case, the structural elements of the prepared edges and the dimensions of the weld should be chosen according to the smallest thickness.

8. Size and limit deviations of the leg of the fillet weld To and K 1 must be set during design. In this case, the size of the leg should be no more than 3 mm for parts up to 3 mm thick inclusive and 1.2 thicknesses of a thinner part when welding parts with a thickness of more than 3 mm. Maximum deviations of the size of the fillet weld leg from the nominal value are given in Appendix 4.

9. (Deleted, Rev. No. 1).

10. (Deleted, Rev. No. 3).

11. Convexity or concavity of the fillet weld is allowed up to 30% of its leg, but not more than 3 mm. In this case, the concavity should not lead to a decrease in the value of the leg K p(Fig. 4) installed during the design.

Note. leg Ton is the leg of the largest right triangle inscribed in the outer part of the fillet weld. With a symmetrical seam for the leg Ton any of the equal legs is accepted, with an asymmetrical seam - a smaller one.

(Revised edition, Rev. No. 3).

12. Before welding, the displacement of the edges relative to each other is allowed no more than:

0,2s mm - for parts up to 4 mm thick;

0,1s+ 0.5 mm - for parts with a thickness of 5 - 25 mm;

3 mm - for parts with a thickness of 25 - 50 mm;

0,04s+ 1.0 mm - for parts with a thickness of 50 - 100 mm;

0,01s+ 4.0 mm, but not more than 6 mm - for parts with a thickness of more than 100 mm.

13. When welding in carbon dioxide with an electrode wire with a diameter of 0.8 - 1.4 mm, it is allowed to use the main types of welded joints and their structural elements in accordance with GOST 5264-80.

14. The minimum values ​​of the legs of the fillet welds are given in Appendix 1.

15. When using welding in carbon dioxide instead of manual arc welding, the leg of the design fillet weld can be reduced to the values ​​given in Appendix 2.

16. When welding in carbon dioxide with an electrode wire that provides a weld metal with a higher tensile strength than that of the base metal, the leg of the calculated fillet weld can be reduced to the values ​​\u200b\u200bgiven in the recommended Appendix 3.

14 - 16.

17. In butt, tee and corner joints with a thickness of more than 16 mm, performed under installation conditions, it is allowed to increase the nominal value of the size b up to 4 mm. In this case, the width of the seam can be increased accordingly. e, e 1 .

18. It is allowed in places where welds overlap and in places where defects are corrected, an increase in the size of the welds up to 30% of the nominal value.

19. When preparing edges using a hand tool, the maximum deviations of the bevel angle of the edges can be increased up to ± 5 °. In this case, the width of the seam can be changed accordingly. e, e 1 .

17 - 19. (Introduced additionally, Amendment No. 3).

Note. The minimum leg value must not exceed 1.2 times the thickness of the thinner element.

Note. The given data does not apply to connections made when welding on an extended electrode stick-out or on a direct current polarity.

APPENDICES 1-3.(Introduced additionally, Amendment No. 1).

APPENDIX 4(Introduced additionally, Amendment No. 3).

GOST 14771-76

INTERSTATE STANDARD

SHIELDED ARC WELDING

WELDED CONNECTIONS

MAIN TYPES, CONSTRUCTION ELEMENTS AND DIMENSIONS

Official edition

Standartinform

INTERSTATE STANDARD

Arc welding in shielding gas

JOINTS WELDED

Main types, structural elements and dimensions

Gas-shielded arc welding.

Main types, design elements and dimensions MKC 25.160.40

GOST 14771-69

By the Decree of the State Committee of Standards of the Council of Ministers of the USSR dated July 28, 1976 No. 1826, the introduction date was set

The validity period was removed by the Decree of the State Standard of 18.06.92 No. 553

1. This standard establishes the main types, structural elements and dimensions of welded joints made of steels, as well as alloys on iron-nickel and nickel bases, performed by gas-shielded arc welding.

The standard does not establish the main types, structural elements and dimensions of welded joints of steel pipelines in accordance with GOST 16037-80.

2. The following designations for welding methods are accepted in the standard:

IN - in inert gases, non-consumable electrode without filler metal;

INp - in inert gases with a non-consumable electrode with filler metal;

IP - in inert gases and their mixtures with carbon dioxide and oxygen by a consumable electrode;

UP - in carbon dioxide and its mixture with oxygen by a consumable electrode.

3. The main types of welded joints must correspond to those indicated in Table. one.

Official publication Reprint prohibited

Edition (December 2006) with Amendments No. 1, 2, 3, approved in March 1982, December 1986,

January 1989 (IUS 6-82, 3-87, 4-89).

© Standards Publishing House, 1976 © Standartinform, 2007

ready]

Character

Cross section shape

With folded two edges

Unilateral

With one edging

T///W\m

Unilateral

Without bevel

Unilateral

Unilateral

Bilateral

GOST 14771-Tb

Character

Cross section shape

Thickness of parts to be welded, mm, for welding methods

Conditional

designation

welded

connections

Unilateral

Unilateral

Beveled on one edge

Unilateral

Unilateral

castle

With a curved bevel of one edge

With a broken bevel on one edge

Bilateral

metric bevels of one edge

GOST 14771-Tb C.

4 GOST 14771-Tb

Character

Cross section shape

Thickness of parts to be welded, mm, for welding methods

Conditional

designation

welded

connections

With a broken bevel of two edges

With two symmetrical bevels of two lumps

With two symmetrical curves

Bilateral

the two edges themselves

With two symmetrical lo-

two edges

With one edging

Unilateral

Without beveled edges

Cross section shape

Thickness of the parts to be welded, mm, yes welding methods

Conditional

designation

0,8-12,0

GOST 14771-Tb

Character

Cross section shape

Thickness of parts to be welded, mm, for welding methods

Conditional

designation

welded

Without bevel

Bilateral

Unilateral

1

Beveled on one edge

»

Bilateral

1

metric bevels on one edge

Bilateral

Unilateral

Without bevel

Bilateral

0,8-10,0

tz

GOST 14771-Tb C.

4. Structural elements of welded joints, their dimensions and limit deviations for them must correspond to those indicated in table. 2-47. In addition to these welding methods, it is allowed to use other methods of gas-shielded arc welding.

Dimensions, mm

Table 3

Dimensions, mm

Table 4

Structural elements

weld seam

e, no more

+0,2

in

1,0-1,4

^Size for reference

+ 1,0

Table 5

Dimensions, mm

Table 6

-Yo o I I I"

pp

Dimensions, mm

P. 10 GOST 14771-76

Table 10

a

Welding method

1

U

GOST 14771-76 S. 11

12 GOST 14771-76

Dimensions, mm

£e I 3 Zon yo o e as re

S 03 5 £ o mc X f S o

Welding method

Previous off

Previous off

Previous off

Previous off

y, hail. (offset limit +2°)

GOST 14771-76 S. 13

14 GOST 14771-Tb

Table 15

Dimensions, mm

Table 16

GOST 14771-Tb S. 17

18 GOST 14771-Tb

GOST 14771--76 S. 19

20 GOST 14771-76

GOST 14771-Tb S. 21

Table 25

Dimensions, mm

Table 26

Dimensions, mm

Table 27

Table 28

Dimensions, mm

Table 29

Table 30

^Size for reference

Dimensions, mm

Table 31

Dimensions, mm

Table 32

Table 33

Dimensions, mm

Table 34

Dimensions, mm

Table 35

GOST 14771-Tb S. 27

Dimensions, mm

28 GOST 14771-76

Table 38

Dimensions, mm

Table 39

Table 40

Dimensions, mm

Table 41

Conditional

designation

welded

connections

Structural elements

prepared edges of welded parts

weld seam

Previous off

tz

1

INp, IP, UP

6,0-20,0

+ 1,0

+2,0

Dimensions, mm

Table 43

and I

Welding method

Previous off

Previous off

Dimensions, mm

P. 32 GOST 14771-76

Table 46

Conditional

designation

welded

connections

Structural elements

prepared edges of welded parts

weld seam

+ 1,0

+ 1,0

+2,0

Table 48

(Changed edition, Rev. No. 1, 2, 3).

5. When making the root of a multilayer weld by a welding method different from the main method by which the groove is filled, the values ​​of the structural elements of the welded joint must be selected according to the main welding method. In this case, the designation of the welding method should be carried out with a shot, in the numerator of which the designation of the root welding method is given, and in the denominator - the designation of the main welding method.

6. For welded joints C12, C21, C23, C24, U7, U10,

T7, having a thickness of parts s = 12 mm or more, as well as for joints S15, S16, S25, S27, U8, T8, having a thickness of parts s = 20 mm or more, performed by the UP welding method, blunting is allowed with = (5+ 2) mm.

7. Butt welding of parts of unequal thickness in case of a difference in thickness not exceeding the values ​​\u200b\u200bspecified in Table. 48, must be carried out in the same way as the parts

the same thickness; the structural elements of the prepared edges and the dimensions of the weld should be selected according to the greater thickness.

To make a smooth transition from one part to another, an inclined arrangement of the weld surface is allowed (Fig. 1).

With a difference in the thickness of the parts to be welded above the values ​​\u200b\u200bspecified in Table. 48, on a part having a large thickness Sj, a bevel should be made on one or both sides to the thickness of a thin part s, as indicated in Fig. 2 and 3. In this case, the structural elements of the prepared edges and the dimensions of the weld should be chosen according to the smallest thickness.

8. The size and limit deviations of the leg of the fillet weld K and K\ must be established during design. In this case, the size of the leg should be no more than 3 mm for parts up to 3 mm thick inclusive and 1.2 thicknesses of a thinner part when welding parts with a thickness of more than 3 mm. Maximum deviations of the size of the fillet weld leg from the nominal value are given in Appendix 4.

9. (Deleted, Rev. No. 1).

10. (Deleted, Rev. No. 3).

11. Convexity or concavity of the fillet weld is allowed up to 30% of its leg, but not more than 3 mm. In this case, the concavity should not lead to a decrease in the value of the leg K p (Fig. 4), established during the design.

Note. The leg K p is the leg of the largest right triangle inscribed in the outer part of the fillet weld. With a symmetrical seam, any of the equal legs is taken for the leg K p, with an asymmetrical seam, the smaller one.

(Revised edition, Rev. No. 3).

12. Before welding, the displacement of the edges relative to each other is allowed no more than:

0.2 s mm - for parts up to 4 mm thick;

0.1 s + 0.5 mm - for parts with a thickness of 5-25 mm;

3 mm - for parts with a thickness of 25-50 mm;

0.04 s + 1.0 mm - for parts with a thickness of 50-100 mm;

0.01 s + 4.0 mm, but not more than 6 mm - for parts with a thickness of more than 100 mm.

13. When welding in carbon dioxide with an electrode wire with a diameter of 0.8-1.4 mm, it is allowed to use the main types of welded joints and their structural elements in accordance with GOST 5264-80.

14. The minimum values ​​of the legs of the fillet welds are given in Appendix 1.

15. When using welding in carbon dioxide instead of manual arc welding, the leg of the design fillet weld can be reduced to the values ​​given in Appendix 2.

16. When welding in carbon dioxide with an electrode wire that provides a weld metal with a higher tensile strength than that of the base metal, the leg of the calculated fillet weld can be reduced to the values ​​\u200b\u200bgiven in Appendix 3.

14-16. (Introduced additionally, Amendment No. 1).

17. In butt, tee and corner joints with a thickness of more than 16 mm, performed under installation conditions, it is allowed to increase the nominal value of dimension b to 4 mm. In this case, the width of the seam e, e± can be increased accordingly.

18. It is allowed in places where welds overlap and in places where defects are corrected, an increase in the size of the welds up to 30% of the nominal value.

19. When preparing edges using a hand tool, the maximum deviations of the bevel angle of the edges can be increased up to +5 °. In this case, the width of the seam e, b\ can be changed accordingly.

17-19. (Introduced additionally, Amendment No. 3).

Note. The minimum leg value must not exceed 1.2 times the thickness of the thinner element.

Fillet weld leg for welding methods

Note. The given data does not apply to connections made when welding on an extended electrode stick-out or on a direct current polarity.

Fillet weld leg for the ratio of the tensile strength of the weld metal to the tensile strength

rupture of base metal

APPENDICES 1-3. (Introduced additionally, Amendment No. 1).

APPENDIX 4. (Introduced additionally, Amendment No. 3).

Editor V.N. Kopysov Technical editor L.A. Guseva Proofreader M.V. Buchnaya Computer Layout L.A. Circular

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Each product or service has certain quality standards. In Russia, the standards for performing welding work correlate with GOSTs. Reinforcement is welded using. Quality is controlled by the document "Welding GOST 14771-76".

This quality standard applies to certain welding jobs. In this case, arc welding is carried out in shielding gas.

This quality standard specifies the main types and structural parts. In addition, the standard specifies the size of welded joints. This GOST is applicable to work with standard steel and some nickel-based alloys. All work is done by arc welding. Welding takes place in a shielding gas environment.

Welding of fittings GOST - semi-automatic welding

SNiP - welding can be performed in two main ways. These are: submerged and with the use of protective gases.

In this case, all work is done both manually and automatically. The welding wire is fed automatically. In this case, the specialist must set the required wire feed speed on the welding equipment. The welder moves the torch on his own.

Semi-automatic welding of reinforcement can be carried out in a wide variety of spatial positions. The thickness of the welded material can vary from 0.5 to 30 and above millimeters. In this way, you can connect a wide variety of materials. That is, this option welds steel 09g2s, non-ferrous and ferrous metals.

During the implementation of this option for connecting the material, the arc is in a “cloud” of shielding gas, which is delivered to the welding site using special equipment. For welding, carbon dioxide and a wide variety of mixtures of various substances are used.

Semi-automatic welding process

The welder independently moves the electrode along the edge manually. The molten metal of the electrode falls into a special bath. The welding wire is fed through a flexible hose to the welding site. The feed rate should not be less than the melting rate. For this type of welding, a wire with a diameter of 0.8 to 1.6 millimeters is used.

Equipment for semi-automatic welding

Welding of fittings, GOST provides for the use of certain equipment.

1. Welding rectifiers. This equipment is used to convert current. There are three classes of rectifiers: based on the number of posts served and power phases. The third class depends on the type of valve.
2. A cylinder filled with a special protective gas.
3. Reducer.
4. Hoses.

Types of welding wire

1. Steel welding.
2. Steel surfacing.
3. Wire made of aluminum or alloys.
4. Cast iron rods.
5. Cored and alloyed wire.

GOST 14771-76 - semi-automatic welding, work technique

During the execution of work, the protective gas displaces air from the place where the connecting work is performed. With the help of special rollers, the wire is fed to the junction of the parts. The rollers are rotated by the action of a special motor, which is located in the inner part. Since the melting of the wire occurs under the influence of current, it must be delivered to the welding site.

This happens with the help of a special bent contact. Gas is supplied to the site from a cylinder. The feed rate and dosing is done automatically. In addition, in some cases, gas supply and adjustment can be done manually.

The molten metal of the electrode and wire is fed to the junction through the nozzle. The liquid substance is supplied in the form of drops and vapor.

Semi-automatic welding technologies

Butt. This is spot welding.

Overlap. In this case, a small piece of metal is applied to the seam and scalded in two ways. It is: solid seam or spot welding.

Welding on pre-drilled holes.

Thus, the reinforcement can be welded using a semi-automatic welding machine. In this case, it is necessary to take into account the peculiarities of the production of work. The welding process is affected by the materials used. First of all, it is gas. For each type of welding work, it is necessary to use a certain type of gas that is supplied to the junction of the parts.

During the whole process, gas and electricity interact. This forces the welder to pay special attention to the safety system.

Welding GOST 14771-76 is the main quality standard for this type of welding. GOST includes a list of various gases, materials and techniques for performing work. If all technical characteristics meet the established standards, then the work will be performed at the proper level.

There are several types of welding machines. In order to choose the right device, you need to know how it works. The welding machine helps to get a high-quality and even seam. Modes...