JB/T 10213-2000 This standard specifies the technical requirements, inspection methods and inspection rules for ventilation welding quality. This standard is applicable to the welding quality inspection of centrifugal and axial flow fans made of low carbon steel, low alloy structural steel and other materials by manual arc welding. Welds of materials and products welded by other welding methods can also be used as a reference. When weldments need to undergo internal quality inspection, it must be clearly specified in the drawings. If there is no stipulation, it shall be handled according to the welding surface quality inspection. This standard was first issued in August 2000. JB/T 10213-2000 Technical Conditions for Welding Quality Inspection of Fans JB/T10213-2000 Standard download decompression password: www.bzxz.net

JB/T10213-2000
This standard is proposed and managed by the National Technical Committee for Standardization of Fans. The drafting unit of this standard is Shenyang Blower Research Institute. The main drafters of this standard are Liu Dongju and Zheng Hua. 408
1 Scope
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Inspection of Fan Welding Quality
Specifications for fan welding inspection This standard specifies the technical requirements, inspection methods and inspection rules for fan welding quality. JB/T10213—2000
This standard is applicable to the weld quality inspection of centrifugal and axial flow fans made of low carbon steel, low alloy structural steel and other materials welded by manual arc welding. The welds of materials and products welded by other welding methods can also be used for reference. When the weldment needs to be inspected internally, it must be clearly specified in the drawing. If there is no specification, it shall be handled according to the welding surface quality inspection. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T985-1988 Basic forms and dimensions of grooves for gas welding, manual arc welding and gas shielded welding GB/T986—1988 Basic forms and dimensions of grooves for submerged arc welding GB/T324—1988 Symbolic representation of welds
GB/T3323--1987 Radiography and quality grading of steel fusion welded butt joints GB/T 3375-1994
GB/T 8170--1987
Welding terminology
Rules for numerical rounding off
JB4730--1994 Nondestructive testing of pressure vessels 3 Technical requirements
3.1 Welding surface quality
3.1.1 The basic forms and dimensions of weld grooves shall comply with the provisions of GB/T985 and GB/T986, design drawings and process documents. 3.1.2 The symbolic representation of welds and the welding terminology used shall comply with the requirements of GB/T324 and GB/T3375. 3.1.3 Weld shape
3.1.3.1 The weld shape shall be smooth and even, with a smooth transition between welds and between welds and base metal, and no sudden changes in cross section.
3.1.3.2 The lower limit of the height of the single-sided or double-sided butt weld (see Figure 1) shall not be lower than the surface of the steel plate, and the upper limit shall not exceed the following provisions:
a) Weld height △h of rotating parts:
When ≤3mm, 4h≤1+0.10C, Ahz≤1+0.10C2When 8≥3mm, △h,≤1+0.05Ct, △hz≤1+0.05C2; b) Weld height △h of non-rotating parts:
When ≤3mn, h≤1+0,15C, Ah z≤1+0.15C2; when 8>3mm, Ah≤1+0.10C1, Ahz≤1+0.10Cz Guohao Machinery Industry Bureau 2000-08-31 approved 2001-01-01 implementation
JB/T10213
plate thickness;
front weld width C2--root weld width: hfront weld excess height, △hzroot weld excess height Figure 1 Butt weld excess height
3.1.3.3 The actual weld leg size K of the fillet weld must be greater than or equal to 0.9K., and the monthly weld leg thickness T must be greater than or equal to 0.781. See Figure 2.
K. - weld leg size specified in the drawing; K - actual weld leg size; T - weld leg thickness - thin plate thickness; - thick plate thickness Figure 2 Fillet weld leg
3.1.3.4 The effective length of intermittent or staggered intermittent fillet welds shall not be less than that specified in the drawing. 3.1.3.5 Within any 25mm length of the weld, the surface convexity (b-α) shall not be greater than 2mm, see Figure 3. o
α—the lowest point of the weld; b the highest point of the weld
Figure 3 Weld surface convexity
3.1.3.6 The concave depth X at the intersection of multiple-pass and multi-layer overlapping welds shall not be greater than 1.5mm, see Figure 4. 410
JB/T 10213—2000
Weld surface concave depth
X (concave depth)
3.1.3.7 The difference in weld width of butt welds within any 50mm length (W1-W1) shall not be greater than 3mm, see Figure 5. DD
3.1.4 Welding defects
W—the widest part of the weld; W2—the narrowest part of the weld Figure 5 Weld width difference
3.1.4.1 There shall be no cracks, weld penetrations or unfilled craters on the weld surface. 3.1.4.2 The undercut depth d (see Figure 6) of butt welds and fillet welds shall not exceed the following provisions: a) Undercut of rotating parts welds;
When ≤3mm, undercut is not allowed;
When a>3mm, d≤0.5mm, and the total length of undercut on both sides of the weld shall not exceed 15% of the length of the weld to be inspected. b) Undercut d≤0.8mm of non-rotating parts welds, and the total length of undercut on both sides of the weld shall not exceed 20% of the length of the weld to be inspected. One plate thickness; d Undercut depth
Figure 6 Undercut
3.1.4.3 The misalignment e (see Figure 7) of single-sided or double-sided butt welds shall not exceed the following provisions: a) Misalignment of rotating parts welds: e≤0.10 but not more than 2mm at most. b) Misalignment of non-rotating parts welds: e≤0.153 but not more than 3mm at most. Single-sided weld (weld root side)
a—plate thickness se—misalignment
Figure 7 Misalignment of butt weld
Double-sided weld
JB/T10213-2000
3.1.4.4 No weld bead larger than 2mm is allowed on the weld surface, see Figure 8. $2
Weld bead
3.1.4.5 No overflow due to molten metal flowing onto the unmelted base metal outside the weld is allowed on the weld surface, see Figure 9. Figure 9 Overflow
3.1.4.6 No grouped or reticular pores are allowed on the weld surface. Single and dense pores (see Figure 10) shall meet the following requirements: a) Rotating part weld
When ≤3mm, no pores are allowed.
When 3mm, there shall be no more than 4 single pores within any 100mm long weld, and their diameter shall not exceed 1mm, and their spacing shall be greater than 10mm.
b) Non-rotating parts weld
The diameter of a single pore shall not exceed 1.5mm.
The diameter of dense pores shall not exceed 0.5mm, the number shall not exceed 3, and the spacing shall be greater than 2mm. There shall be no more than 2 groups within the range of 1m long weld, and the spacing between groups shall be greater than 10mm.
Figure 10 Porosity
3.2 Internal quality of welding
JB/T10213--2000
3.2.1 Internal quality inspection can only be carried out after the surface quality inspection of the weld is qualified. 3.2.2 There are no defects such as cracks, lack of fusion and lack of penetration inside the weld, as shown in Figures 11 to 13. , Lack of fusion
Lack of fusion
3.2.3 Circular defects in welds shall not exceed the following provisions: Defects with an aspect ratio of less than or equal to 3 are defined as circular defects. Lack of penetration
Circular defects can be circular, elliptical, conical or with a tail (the tail should be included when measuring the size) and other irregular shapes, including pores and slag inclusions, as shown in Figures 14 and 15. The number and size of circular defects shall not exceed the provisions of Table 1, and the assessment area shall be selected at the location where the defect is most serious. Porosity
Base material thickness?
>10～15
>15～25
>25 ~50
>50～100
Evaluation area size
10×10
10×10
10×20
10×20
10×30
Quality regulations for circular defects
Number of defectswww.bzxz.net
10～12
13～15
Note: The allowable number of defects should be converted in proportion to the corresponding base material thickness and rounded according to GB/T8170. 3.2.4 When evaluating circular defects, the defect size should be converted into the number of defects according to Table 2. Table 2 Defect point conversion table
Defect long diameter
3.2.5 Strip inclusions in welds
>2～3
>3～4
≥4~6
Size of defects without counting points
(long diameter of defect) mm
Slag inclusions with an aspect ratio greater than 3 are defined as strip inclusions. Refer to Figure 15. The length of a single strip inclusion and its total length shall not exceed the requirements of Table 3.
Thickness of parent metal.
>12~60
1L is the longest length of this group of inclusions.
JB/T10213— 2000
Table 3 Quality requirements for strip inclusions
Length of a single strip inclusion
(1/3)8
2Long pores with an aspect ratio greater than 3 shall comply with the requirements in the table. Total length of strip slag inclusions
On any straight line, the distance between two adjacent groups of slag inclusions does not exceed 6L. The cumulative length of any group of slag inclusions within 128 weld length is not allowed to exceed? When the length of the weld to be picked is less than 125, it can be converted in proportion. When the converted total length of strip slag inclusions is less than the length of a single strip slag inclusion, the length of a single strip slag inclusion of 3
is the allowable value.
4 Inspection method
4.1 Before inspection, all scales, welding slag, spatter and other dirt that hinder inspection on the base metal 10~~20mm near the weld must be cleaned.
4.2 Observe the surface defects of the weld with the naked eye or a magnifying glass. If there is undercut, the shape of the defect can be copied with putty and then its size can be measured. The boundaries of small surface cracks can be determined by acid etching, or kerosene can be applied to the crack area on the weld surface, wiped dry and then coated with white powder. The yellow stripes displayed by kerosene seepage indicate the outline of the crack. 4.3 When checking the weld size, use the corresponding template and weld size gauge for measurement. 4.4 If the weldment needs to be non-destructively tested, it must be specified in the drawing and inspected according to the drawing requirements. The methods of weld radiographic testing, ultrasonic testing, surface testing and weld defect grade assessment shall be implemented in accordance with JB4730. 5 Inspection rules
5.1 After welding, the weldment shall be inspected by the technical inspection department and a certificate of qualification shall be issued. 5.2 All welds shall be inspected for size and surface quality, and the surface quality shall comply with the provisions of 3.1. 5.3 Items of surface quality inspection:
a) Undercut, misalignment and weld bead;
b) Surface pores;
c) Surface cracks on weld metal and near-weld area; d) Arc pits;
e) Burn-through.
5.4 Defects found in the surface quality inspection are allowed to be repaired, but the number of times the same weld is repaired shall not exceed three times. The repair welding process is the same as the original welding process. 5.5
5.6 Nondestructive testing or welding internal quality inspection can only be carried out after the surface quality inspection is qualified. 5.7 The radiographic inspection of welds shall comply with the provisions of 3.2.2 to 3.2.5. 5.8 When ultrasonic internal quality inspection is used, it shall comply with the provisions of JB4730, and its maximum allowable defect indication length shall be implemented according to Class I.
5.9 For welds that do not meet the standards, the defects should be removed and re-welded, and the repair should be inspected again to meet the requirements of the standards. Those that cannot be repaired or still fail to meet the requirements of the standards after three repairs should be scrapped. 6 Flaw detection inspection report and archiving
6.1 After radiographic and ultrasonic inspections, the inspection results and related matters should be recorded in detail and an inspection report should be written. 6.2 Main contents of the flaw detection report: workpiece name, thickness, number, flaw detection method, instrument used, acceptance criteria, flaw detection ratio, part diagram, repair situation, flaw detection conclusion, operator, person in charge and flaw detection period, etc. 6.3 The flaw detection report must be archived and properly kept for more than 3 years for easy review at any time.
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