JB/T 5000.3-1998 General technical conditions for welding parts of heavy machinery
Some standard content:
ICS25.160
J33
JB
Machinery Industry Standard of the People's Republic of China
JB/T5000.3-1998
General Technical Conditions for Heavy Machinery|| tt||Welding parts
The heavy mechanical general techniques and standardsWelding
Released on 1998-09-30
National Machinery Industry Bureau
Released
1998- 12-01 Implementation
JB/T5000.3—1998
Previous
Preface
This standard was proposed and managed by the Metallurgical Equipment Standardization Technical Committee of the Ministry of Machinery Industry. This standard is drafted by: Taiyuan Heavy Machinery (Group) Co., Ltd. Unit participating in the drafting of this standard: Xi'an Heavy Machinery Research Institute, the main drafters of this standard: Chen Peijun, Chen Qingyang, Cheng, 1 Scope
Machinery Industry Standards of the People's Republic of China
General Technical Conditions for Heavy Machinery||tt ||Welding parts
The heavy mechanical general techniques and standardsWelding
This standard specifies the general technical conditions for welding parts that do not have special requirements in product drawings or design documents. JB/T5000.3~-1998
This standard applies to steel welding parts welded by manual arc welding, gas shielded welding and submerged arc welding in heavy machinery and parts. Any special requirements for welding parts should be noted in the product drawing or process document. 2 Referenced standards
The provisions contained in the following standards constitute provisions of this standard by being quoted in this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision and parties using this standard should explore the possibility of using the latest version of the standard listed below. GB324-88
GB/T 983-1995
GB984-85
GB985-88
GB986-88
GB2649--89||tt ||GB2650-89
GB2651-89
GB265289
GB2653—89
GB2654-89
GB2655-89
GB2656- 81
GB332387
GB3669-83
GB/T3670-1995
GB/T5117-1995
GB/T5118-1995
GB5185-85
GB529385
GB/T8110-1995
GB9460—88
Weld symbol representation
Stainless steel electrode
Stack Welding electrodes
Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding Basic forms and dimensions of submerged arc welding grooves Basic forms and dimensions of welded joints Mechanical property testing Sampling methods Welded joints Impact test methods| |tt||Tensile test method for welded joints
Tensile test method for welded joints and deposited metal
Bending and flattening test methods for welded joints
Hardness of welded joints and surfacing metal Test Methods Test Methods for Strain Aging Sensitivity of Welded Joints Test Methods for Fatigue Tests of Weld Metals and Welded Joints Steel Fusion Welded Butt Joints Radiography and Quality Grading Aluminum and Aluminum Alloy Welding Rods
Copper and Copper Alloy Welding Rods
Carbon steel welding rods
Low alloy steel welding rods
Metal welding and brazing method code on the drawing Flux for carbon steel submerged arc welding
Carbon steel for gas shielded arc welding, Low alloy steel welding wire copper and copper alloy welding wire
National Machinery Industry Bureau approved on 1998-09-30 and implemented on 1998-12-01
1
GB10044-88
GB10045 —88
GB10858-89
GB11345—89
GB/T12469-90
GB12470—90
GB/T13814-92||tt| |GB/T15620-1995
JB2880-81
JB3223—96
JB/T5926-91
JB/T6046—92
JB/T 6061-92
JB/T7949-1995
JB/T5000.2-1998
JB/T5000.11-1998
JB/T5000.12—1998| |tt||JB/T50077-1996
JB/Z286-87
3 General requirements
JB/T5000.3-1998
Cast iron welding rods and wires|| tt | Flux for arc welding
Nickel and nickel alloy electrodes
Nickel and nickel alloy wires
Steel welding pressure vessels·Technical conditions
Welding materials quality management regulations|| tt||Vibration aging process parameter selection and technical requirements for carbon steel and low alloy steel welded components Post-weld heat treatment method Weld magnetic particle inspection method and grading of defect magnetic marks Outline dimensions of steel structure welds
General technical conditions for heavy machinery
Ox flame cutting parts
General technical conditions for heavy machinery piping
General technical conditions for heavy machinery coating
Carbon steel and low alloy steel welding wire products for gas shielded arc welding Quality Graded Carbon Dioxide Gas Shielded Welding Process Regulations
3.1 The manufacture of welded parts shall comply with the design drawings, process documents and the provisions of this standard. 3.2 The steel grade, specifications, and dimensions of the raw materials (steel plates, section steels, steel pipes, etc.) used to manufacture welded parts should comply with the design drawing requirements. If they do not meet the requirements, they should be substituted according to the factory material substitution system. 3.3 When raw materials (steel plates, steel sections, steel pipes, etc.) and welding materials (welding rods, welding wires, fluxes, shielding gases, etc.) used to make welded parts enter the factory, they must be inspected by the technical inspection department based on the manufacturer’s certificate of conformity and ordering requirements. Only after acceptance according to the factory's "Raw Raw Materials Incoming Acceptance Rules" will they be allowed to be put into the warehouse.
3.4 ??Raw materials and welding materials without brands and certificates of conformity must be inspected and identified to determine their brands and specifications before they can be used. 3.5 It is strictly prohibited to use various materials with unknown brands and without acceptance by the inspection department. 3.6 The use and management of welding materials shall be in accordance with the provisions of JB3223. 3.7 The quality of flame cutting parts must comply with the regulations of JB/T5000.2. 3.8 Surface rust removal of welded parts must be carried out before painting. The quality level shall be as specified in JB/T5000.12. 4 Preliminary correction of steel materials
4.1 Before marking, any steel materials whose tolerances do not meet the requirements of 4.2 and 4.3 must be corrected to meet the required tolerances. The local flatness of the steel plate should not exceed the requirements in Table 1. 4.2
Table 1,
The allowable value of flatness within 1000 lengths
Pregnancy 14
Thickness 8>14
Measuring tools||tt| |1000 long square feet
1000
Picture
mm
When the various deformations of the section steel exceed the requirements in Table 2 before marking, they must be corrected before marking, and The local corrugation and flatness shall not exceed 4.3
per meter length and shall not exceed 2mm.
2
5
steel
straightness of channel steel and I-beam
distortion of channel steel and T-beam
steel Forming bend
JB/T5000.3—1998
Table 2
Full length straightness
1.5
x
1000| |tt||The cell width is not tilted to 90°, calculated based on pancreatic width 6: 100×b, but not greater than 1.5
(unequal angle steel is calculated based on length and width) full-length straightness
f
Crooked:
1.5
|X
5.1 For circular bending of steel, when the bending radius (inner radius) is greater than the following values, cold bending can be performed (Figure 1). Figure 1
5.1.1 Steel plate: for low alloy steel R≥25: for low carbon steel R≥20.
mm
3
4
JB/T5000.3-1998
Among them: R--bending radius;--steel plate thickness, I-shaped Steel: R≥25H or R≥25B (depending on the bending direction) 5.1.21
Among them, H - I-beam height, B - I-beam leg width. Channel steel: R≥45B or R≥25H (depending on the bending direction). 5.1.3
Among them: H——height of channel steel, B——channel steel leg width. Angle steel: R≥45B.
5.1.4
Among them: B is the width of the leg of the angle steel (for unequal angle steel, it depends on the bending direction). 5.2 For circular bending of steel, when the bending radius (inner radius) is less than the value specified in 5.1, hot bending or post-bending heat treatment must be performed according to the specific process. For hot bending, the steel should be heated to 900~1100℃. When bending is completed, the temperature shall not be lower than 700°C. For ordinary low alloy steel, attention should be paid to slow cooling.
5.3
The dimensional tolerance of the bending-formed cylinder is as specified in Figure 2 and Table 3. \\
Figure 2
Table 3
Outer
Diameter D
500
>500~1000
> 100G~-1500
>1500~2000
>2000~2500
>2500~3000
>3G00
ADy
± +
±5
+7
±9
±11
±13
± 15
charge| |tt||Difference
When the plastic thickness of the commercial body is the roundness of the following values ??A-B30
6
00
11
14|| tt||17
20
23
>30
5
7
9
11||tt || 13 | Angle C
3
3
+
s
mm
5.4 Between the simplified body and the simplified body, or between the simplified body and the end cap And the misalignment of the simplified seam shall not be greater than 20% of the thickness and shall not exceed 4mm (see Figure 3 and Figure 4).
VX
Figure 3
Figure 4
JB/TS0003-1998
Bending forming of 5.5 pipes, the heating temperature during hot bending is 800~1000 ℃, the temperature during the bending process shall not be lower than 700°C, and the cold bending shall be carried out on a special pipe bending machine.
The bending radius R of the 5.6 pipe (see Figure 5) shall comply with JB/T5000.11-1998 Chinese style (1) and formula (2) requirements Figure 5
5.7
The bending radius tolerance, roundness tolerance and allowable corrugation depth of the pipe are as specified in Table 4. Table 4
好
charge
秋
R=75～125
bend
radius
my| | tt | |R160-300
R=400
R=506～1000
R>1000
R=75
R=100||tt| |R=125
R=160
R200
'R=30t.
R=aof
R=5(k||tt| |ft
wave effect at the change
main
king
+2
tube
70
sub| |tt||Outer
Diameter
83
±4
±3
200
Schematic diagram
mm| |tt||5.8 The amount of wall thickness reduction after bending of the pipe (tension surface) JB/T5000.3-1998
5.8.1 The amount of cold bending thinning should comply with the provisions of 3.6 in JB/T5000.11-1998 . 5.8.2 The amount of hot bending thinning shall not exceed 20% of the wall thickness. 6 Welding assembly
6.1 The geometric dimensions and dimensions of each part should be checked before welding assembly. Whether the appearance quality meets the design drawings and process requirements, parts that do not meet the requirements are not allowed to be assembled.
6.3 The measuring tools and tools used in welding and assembly should be safe and accurate. 6.4 The cast iron or steel used in welding and assembly should be used. The flatness of the cast steel platform is less than or equal to 1mm/m. The flatness of the entire platform is less than or equal to 1.5mm/m. The flatness of a platform assembled from two or more pieces of platforms is less than or equal to 2mm/m. 6.5 Welding assembly should be considered. The ease of operation of the welder during welding can be used to formulate the most reasonable assembly sequence. 6.6 The welding assembly gap should comply with the requirements of the drawing and relevant standards. In individual cases, for butt welds with no gaps and gap tolerances of 0 to 2 mm. and fillet welds, the maximum local gap should be less than 30% of the minimum wall thickness of the connecting piece, and the maximum local gap should not be greater than 5mm, and should be less than 20% of the total length of the weld. 6.7 Welding assembly positioning welding
6.7.1 The properties of the welding materials used for welding assembly tack welding should be the same as those used for formal welding. 6.7.2 When preheating is required for formal welding, it must also be preheated during assembly tack welding. heat, and the preheating temperature is 30C higher than the formal welding preheating temperature
6.8 It is prohibited to ignite arcs in the non-welding area of ??the workpiece
7.1 - General requirements ||tt| |Welders should undergo special training and must be qualified before they can undertake welding work. 7. 1.1
7.1.2 Before welding, surface dirt in the welding area should be removed in advance, such as rust, oxide scale, oil stains, paint, etc. The cleaning area should be no less than 10mm from the edge of the weld.
7.1.3 When welding in the open air. In case of rain, snow, heavy fog, strong wind, etc., no welding is allowed without protective measures. 7.2 Preheating before welding
7.2.1 Welding parts of low carbon steel generally can be welded without preheating, but when the ambient temperature is lower than 0C or the thickness is large, pre-welding must also be carried out according to the process requirements. Preheat and slow cool. 7.2.2 For welded parts of low-alloy structural steel, factors such as carbon equivalent, component thickness, restraint of the welded joint, ambient temperature, and welding materials used must be comprehensively considered. Determine the welding preheating temperature. Table 5 gives the recommended preheating temperature. When welding with non-low hydrogen welding materials, the critical plate thickness should be appropriately reduced or the preheating temperature should be appropriately increased. The preheating temperature of specific components is determined by the welding technician based on the specific conditions of the structure.
Table 5
Steel
No.
09Mn2(Q295)
09Mn2Si
09MnV(Q295)
12Mn( Q295)
Thickness
Degree
mm
Preheat before welding
c
No preheating
No preheating Hot
No preheating
No preheating
Steel number
16Mn(Q345)
16MnRE(Q345)
14MnNb(Q345 )
15MnV(Q390)
15MnTi(Q390)
4MnMoNb
15MnVN(Q420)
14MnVTiRE(Q420)
18MnMoNb| |tt||14MnMoV
14MnMoVB
JB/T 5000.3---1998
Table 5 (end)
Thickness
mm
>40
>40
>40
32
>32
32
32
The preheating temperature for welding of different materials shall be selected according to the difference in weldability. 7. 2. 3 .
For the same material but different thickness, the preheating temperature for welding shall be determined according to the one with the larger thickness. 7.2.4
7. 2. 5
Preheating before welding
c
190
≥100
≥100
No preheating
>100
ido
100
1SG
≥150
≥150
The preheating area is not less than 23 (a is the plate thickness) from the center of the weld on each side, and not less than 50mm. For special materials or special structures The preheating temperature, interlayer temperature, post-heating or quasi-heat treatment of structural welding shall be carried out in accordance with the process requirements: 7.2:6
7.3 Unmarked dimensions and form and position tolerances of welded parts
7.3.1 Length dimension tolerance
The length dimensions listed in Table 6 do not have limit deviations. Applicable to the length dimensions of welded parts and welded parts. Such as external dimensions, internal dimensions, step dimensions, width and center distance dimensions, etc., generally Class B is selected and no marking is required. Otherwise, the accuracy level should be indicated on the design drawing. Table 6
Emotion
Level
A
B
C
D
>30
~120
±3
±2Www.bzxZ.net
±3
±4
>120
~400
1
±2
24|| tt||±7
>409
~1000
±2
±3
±6
±9
>1000
~2000
=3
±4
±8
±12
Note: The nominal size is less than 30mm. The allowable deviation is ±1mm. 7.3.2 Angle
Metric
>2000
~4000
±4
±6
±11
±16
Ruler
>4000
~8000
±5
±8
±14
±21
4
>8000
~12000
±6
±1o
±18
±27
>12000| |tt||~16000
±7
±12
±21
±32
>16000
~20000
±8
±14
±24
±36
mm
>20000
±9
±16
±27
±40
Angle without limit deviation According to Table 7, the nominal size of angle deviation takes the short side as the reference side, and its length is calculated from the reference point marked on the drawing (see Figures 6 to 10). If the angle is not marked on the drawing, but only the length dimension is marked, the allowable deviation is measured in mm/m. Generally, Class B is selected and no marking is required. Otherwise, the accuracy level should be indicated on the design drawing. 7
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