This standard specifies the requirements, test methods, inspection rules, marking and certification for welded parts of electrical equipment products. This standard applies to welded parts of electrical equipment products completed by manual arc welding, submerged arc welding, gas welding, metal arc welding, gas tungsten arc welding or other welding methods. JB/T 4328.5-1999 General Technical Conditions for Welded Parts of Electrical Equipment JB/T4328.5-1999 Standard download decompression password: www.bzxz.net

JB/T4328.5-1999
This standard is a revision of JB4328.5-86 "General Technical Conditions for Welding Parts of Special Electric Equipment". This standard replaces JB4328.5-86 from the date of implementation. This standard is proposed and managed by Shenyang Special Electric Equipment Research Institute. This standard is drafted by Shenyang Special Electric Equipment Research Institute and Shenyang Electric Machinery Co., Ltd. The main drafters of this standard are Yang Yinqiang and Chen Jiashan. The first release date of this standard is December 1, 1986, when this standard was revised for the first time. Shenyang Special Electric Equipment Research Institute is entrusted with the interpretation of this standard. 102
1 Scope
Machinery Industry Standard of the People's Republic of China
Electrical Special Equipment
General Technical Conditions for Welding Parts
Welding products general requirements for theelectricianspecialequipment
JB/T4328.5-1999
Replaces JB4328.5-86
This standard specifies the requirements, test methods, inspection rules, marking and certificates for welding parts of electrical special equipment products. This standard applies to welding parts of electrical special equipment products completed by manual arc welding, submerged arc welding, gas welding, metal arc gas shielded welding, tungsten arc gas shielded welding or other welding methods. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. At the time of publication of the standard, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB150—1998
GB151—1989
GB/T985—1988
GB/T986—1988
GB/T1804—1992
Steel pressure vessels
Steel shell and tube heat exchangers
Basic forms and dimensions of weld grooves for gas welding, manual arc welding and gas shielded weldingBasic forms and dimensions of weld grooves for submerged arc weldingGeneral tolerancesUnindicated tolerances for linear dimensions
JB4730—1994Nondestructive testing of pressure vessels《Examination Rules for Welders of Boiler and Pressure Vessels》(1988 edition)3 Requirements
3.1 Materials for welded parts
3.1.1 The steel grade, specifications and dimensions of the raw materials used for welded parts shall comply with the requirements of the drawings and design documents. The welding materials (electrodes, welding wires, flux and shielding gas, etc.) used for welding shall comply with the requirements of the drawings and process documents. 3.1.2
3.1.3 When the raw materials and welding materials used for welding enter the factory, they shall be inspected and qualified by the technical inspection department before they can be put into the warehouse. 3.1.4 For materials in doubt, they must be re-inspected and qualified before they can be used. 3.2 Requirements before welding
3.2.1. Steel can be cut by shearing or flame cutting. 3.2.2 Steel with a thickness of 5~150mm can be cut by flame cutting. The quality requirements of the cutting surface are as follows: a) The depth of the cut mark on the cutting surface (expressed in G) shall comply with the requirements of Table 1. Approved by the State Bureau of Machinery Industry on August 6, 1999 and implemented on January 1, 2000
Depth of cut mark (G)
≤320
JB/T4328.51999
b) Flatness is calculated according to the thickness θ of the steel plate being cut, and its tolerance shall comply with the provisions of Table 2. Table 2
Flatness (B)
≤1%8
≤2%8
≤3%8
≤4%8
208150
c) Upper edge melting degree (expressed by S), its grade and melting degree shall comply with the provisions of Table 3. Table 3
Basic corner cleaning, edge width ≤0.5
Rounded corners on the upper edge, collapsed edge width ≤1
Degree of melting (S) and state
Obviously rounded corners on the upper edge, increased edge width ≤1.5; molten metal on the edgeObviously rounded corners on the upper edge, tower edge width ≤2.5; continuous molten metal on the edged) Slag (indicated by Z), the state of each level is specified in Table 4. Table 4
Little slag, can be peeled off automatically
Slag, easy to remove
Strip slag, can be removed with a shovel
Slag state (Z)
Slag is difficult to remove and leaves traces
e) Limit spacing of defects (indicated by Q), its level and limit spacing of defects shall be implemented in accordance with the provisions of Table 5. Table 5
The spacing of each defect (Q)
Note: The groove depth is 0.32~1.2mm, and the groove width does not exceed 5mm is called a defect. 104
JB/T4328.5-1999
f) Straightness (expressed by P), its tolerance shall comply with the provisions of Table 6. Table 6
Straightness tolerance (P)
g) Verticality (expressed by C), its tolerance shall comply with the provisions of Table 7. Table 7
Verticality tolerance (C)
≤1%8
≤2%8
≤3%8
≤4%8
When mechanical shearing is adopted, the deviation between the shearing line and the blanking line shall comply with the provisions of Table 8. Table 8
Shear length of parts
>100~250
>250-600
>600~1000
>1000~1500
3.2.4 The misalignment (b) of the butt joint seam between the cylinder and the shell, the cylinder and the head (end cover) and the longitudinal seam of the cylinder shall not exceed 10% of the thickness and shall not exceed 3mm (see Figure 1 and Figure 2).
3.2.5 When bending the steel pipe, cold bending or hot bending is generally adopted, and the bending radius, the maximum and minimum diameter difference and the wrinkle depth at the bending point shall comply with the provisions of Table 9.
JB/T4328.5-1999
0'9岁
0001-00
000091
OST-SL
JB/T4328.51999
For parts that need to be processed on the edge, the limit deviation of the dimensions without tolerance shall comply with the provisions of JS14 or js14 in GB/T1804. The flatness of the steel plate surface shall comply with the provisions of Table 10. Table 10
The thickness of the plate
Within 1000
The verticality and straightness of the steel (angle steel, I-beam, channel steel) shall comply with the provisions of Table 11. Table 11
Straightness
Verticality
Allowable deviation
L≤1000, ≤1.0
L>1000, t
Verticality
and not more than 5
and not more than 2.0.
(Unequal angle steel is calculated according to the long side width) After cutting of simple
steel plates and steel parts, the verticality in the thickness direction shall comply with the provisions of Table 12. Table 12
Part thickness8
>10~18
>18~30
Verticalityt
JB/T4328.5-1999
3.2.10The verticality and parallelism between steel plates and edges, and between the cut section of the steel and its surface shall not be greater than half of the corresponding dimensional tolerance (see Figures 3 and 4).
The mutual position deviation of lap joints shall comply with the provisions of Table 13 (see Figure 5). Da
Steel plate thickness 6
Overlap length deviation a
(Parallelism of B to A)
(Parallelism of B to A)
When butt-jointing steel plates of unequal thickness, if the thickness difference between the two plates (8-,) exceeds the requirements of Table 14, single-sided 3.2.12
(Figure 6a) or double-sided (Figure 6b) thinning should be made on the side of the thicker steel plate, and the thinning length L≥3 (8-8,). Table 14
Thinner plate thickness 8,
Allowable thickness difference (6-8,)
JB/T4328.5-1999
For structures with complex cross-section, the mutual position deviation shall comply with the provisions of Table 15 (see Figure 7) 3.2.13
Height of steel
≤100
>100~240
B≤1000
≤0.015h
≤0.008h
Mutual position deviation (t)
B>1000
≤0.015h
When pipes are butt-jointed, the misalignment b of the pipe wall joints shall not exceed 8 of the pipe wall thickness. 10% and not more than 1.5mm (see Figure 8) Figure 8
JB/T4328.5-1999
3.2.15 Before welding, the diameter limit deviation, roundness and edge angle of cylindrical parts shall comply with the provisions of Table 16 (see Figure 9) F
>1000~1600
>1600~2000
>2000-2500
>2500~3150wwW.bzxz.Net
Outer diameter limit
[Roundness deviation (B,-B)
Wall thickness ≤30
Wall thickness>30
Angle (E)
3.2.16 When gas cutting holes, when the plate thickness is not more than 18mm, the diameter limit deviation shall comply with the provisions of H16 in GB/T1804-1992: Gas cutting disc parts shall comply with the provisions of h16. When the plate thickness is greater than 18~30mm, the limit deviation of the diameter of the gas-made hole (disc) shall be enlarged by 0.5mm according to the above provisions; when the plate thickness is greater than 30mm, the limit deviation of the diameter of the gas-cut hole (disc) shall be enlarged by 1mm according to the above provisions. 3.2.17 Before welding the weldment, the floating rust, oxide scale, water and oil stains in the welding area of ​​the weldment shall be cleaned up. 3.3 Welding requirements
3.3.1 Welders shall undergo special training and pass the assessment before they can perform welding work. Welders who weld pressure vessels must be tested in accordance with the "Boiler Pressure Vessel Welder Examination Rules" issued by the Ministry of Labor and Personnel. After obtaining the welding certificate, they can perform welding work within the scope of qualified projects within the validity period.
3.3.2 When any of the following conditions occur in the welding environment and there are no effective protective measures, welding is prohibited: a) Wind speed is greater than 10m/s during manual welding;
b) Wind speed is greater than 2m/s during gas shielded welding: c) Relative humidity is greater than 90%;
d) Rain or snow environment.
3.3.3 When the temperature of the weldment is lower than 15℃, it should be preheated to above 15℃ within 100mm of the starting welding point. 3.3.4
For weldments with high rigidity and poor weldability, preheating (100~200℃) should be performed before welding, slow cooling and stress relief annealing should be performed after welding. 3.3.5
Weld defects and quality requirements should comply with the provisions of Table 17. 110
Defect name
Weld discontinuity
Uneven scaly
Uniform ripple
Pore or slag inclusion
JB/T4328.5-1999
Quality requirements
Not allowed
Not allowed
Should be within the weld reinforcement height deviation range
In any 100 length of the weld, there shall be no more than 1 pore with a diameter
not more than 0.5 or slag with a diameter not more than
2, and no more than 3 in the entire
length.
2 The pores or slag in the weld of the pressure vessel shall not exceed the requirements of the relevant standards.
Not allowed||The depth of the undercut shall not exceed 0.5. The continuous
length shall not be greater than 100. The total length of the undercut on both sides of the weld shall not exceed 15% of the length of the weld.
For important welds, arc pits are not allowed; for general welds, the depth of the arc pit shall not exceed 10% of the plate thickness and
shall not be greater than 2mm.
Defect name
Butt weld
Size of fillet weld
Weld width is uneven along the length direction
Incomplete penetration
JB/T4328.5-1999||t t||Table 17 (Complete)
Quality requirements
Weld width b=groove width
C+4~8. Weld reinforcement e=0~3 (0~4 for white
dynamic welding)
When K≤6mm: K,(K,)
=K.e1.5;When K>6mm
K,(K,)=e≤2.5
K-Design requirements for weld leg height;
e-weld reinforcement
When b<20;
Ab≤1.5±1;
When b20;
Ab≤2±1.
Not allowed
Not allowed
For important welds and welds requiring penetration
, no penetration is allowed
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