JB/T 9873-1999 This standard is a revision of ZB J50 008.2-88 "General Technical Conditions for Welded Parts of Metal Cutting Machine Tools". During the revision, only editorial changes were made according to relevant regulations, and the main technical content remained unchanged. This standard specifies the basic requirements for the manufacture and acceptance of welded parts and components of metal cutting machine tools. This standard is applicable to metal cutting machine tool welded parts manufactured by manual arc welding or gas shielded welding of carbon structural steel and low alloy structural steel. This standard was first issued in June 1988. JB/T 9873-1999 General Technical Conditions for Welded Parts of Metal Cutting Machine Tools JB/T9873-1999 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T9873-1999
Metal Cutting Machine Tools
General Technical Conditions for Welding Parts
1999-05-20 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JB/T9873-1999
This standard is a revision of 2nJ500082-88 General Technical Conditions for Welding Parts of Metal Cutting Machine Tools: The original version was developed based on the production experience of many years of machine tools in my country and the use requirements of users, and was formulated in accordance with foreign advanced standards. Its technical content can still meet the current scientific and technological level and meet the needs of production and use. This standard is consistent with the technical content of ZD150008.2-88, and has been newly edited according to relevant regulations. From the date of implementation of this standard, it will replace ZBJ50008.2-88. This standard was proposed by the National Joint Technical Committee for Cutting Machine Tools Standardization. This standard is under the Materials and Heat Treatment Branch of the National Technical Committee for Metal Cutting Machine Tools Standardization! 1. The drafting units of this standard are: Beijing Machine Tool Research Institute and Changsha Machine Tool Factory. This standard was first issued in June 1900.
■Scope
Machinery Industry Standard of the People's Republic of China
Metal Cutting Machine Tools
General Technical Conditions for Welded Parts
JB/T9873—1999
This standard specifies the basic requirements for the manufacture and acceptance of welding parts of press-cutting machine tools (hereinafter referred to as machine tools: welding parts). This standard guarantees the weldability of metal cutting machine tools made of high-alloy steel and low-alloy structural steel by low-pressure electric welding or gas shielded welding.
2 Referenced Standards
The provisions contained in the underlined standards constitute the provisions of the standard by reference in this standard. When the standards are published, the versions shown are valid. All standards are subject to revision. Parties using this standard should explore the possibility of using the latest version of the underlined standards.GR/T85—I
GA/T2619—1989
GD:T 2650-[989
BT 265[—1989
GB.T2653—1989
GBT26541989
GH/T 2656—J81
GB/T 3323—1987
3 Materials
Basic forms and dimensions of gas welding, electric welding and gas quick-expansion welding Mechanical performance test of welded joints Glass railing method Impact test method for welded joints
Rotten joint: Tensile test methodwww.bzxz.net
Oil joint: Bending and compression test method
Coal joint: Hardness test of cladding metal Force method Fatigue test method for weld metal and welded joints Steel fusion butt welding Steam radiography and quality distribution 3.1 The number, specification, mechanical performance, etc. of the parent material of the welded joint must comply with the provisions of the relevant standards and 3.2 The welding material composition shall meet the requirements of the drawing or the actual work document, and shall be inspected according to the corresponding standards before use. 4. The minimum deviation of the size of the cut material shall comply with the specifications in Table 2. 4.2 The dimensional deviation of the cut material shall comply with the provisions of Table 2. 4.3 The angle of the cut material shall be determined by the corresponding dimensional deviation. 4.4 The surface tolerance of the plate part is 2mm within any 1000mm length, and the tolerance within the full length range shall comply with the requirements of Table 3. 4. The edge of the plate part is equal to the plate plane. The verticality and verticality tolerances of the parts shall comply with the provisions of Table 4. 4.6 The verticality tolerances of the parts of the type 4.6 parts shall comply with the provisions of Table 5. 4.7 The twist tolerance of the parts of the type 4.7 parts shall not exceed 1mm when the length is less than or equal to 2000mm, and shall not exceed 3mm when the length is greater than 2000mm.
4. The verticality tolerances of the surface of the material and the plane of the material shall comply with the provisions of Table 6: National Machinery Industry Bureau 1999-05-20 Release Standard
200-01-0! Real
Cutting Size
>suo00u
>25(U-.4600)
34000-6300
Cutting ruler
>509-100
>1000~1600
>16((1--25()
>7.SN)-.E(K)
Sheet length ruler
>16nu-29H
>2500-4000
4000-6300
JB/T 9873—1999
川十不需要切
-20--40
>40-60
川需要切加：
平度male lamb
用造，起.1
>20--40
四需制前如!
>43~60
>50-100K
>1UGO--16G
>:600-2500
≥2500--4000
Self-or-An tolerance
Kaidu tolerance
Hengcai medical tolerance
>8·-20
:40-69
JB/T9873-1999
>5D0~1600
1002~16c
Profile intersection degree【edge】
>50-100
>100~200
2166--2500
2500--4000
Key degree table
For parts that do not need to be cut before cutting, there should be no convexity exceeding 0.5m on the cut surface of the single cut, and the trace detection degree【pick-up rate】of the cut surface of the material should not exceed the provisions of the table
>40-60
4000
Technical requirements for production or other requirements of drawings or technical specifications. Welded parts
5.! The appearance of the new joint shall not have droop marks, weld bends, metal splashes and traces of lead. All slags shall be cleaned and the original seams shall be polished. T8/r9873-t999
5.2 The size of the joint parts shall comply with the provisions of Table 8. When the welded parts need to be cut and welded, the size difference shall not exceed two-thirds of the size 1, and the distance between the two parts shall not be less than 4. Table 8 (>500-1200
>1600-2500
>2500--4000
>tKN-630K)
For cutting before cutting:
When the flatness is high, it should be noted in the above process. The angular deviation of the connecting parts shall comply with the requirements of 5.3
in Table 9. (Applicable to less than 90%)
Basic edge (method) size
≥500--:000
>1(KJO
>1000-2500
>250D-4(KK)
For non-real cutting and processing!
4D0-6300
54The tolerances of the flatness and valley difference of the welded parts, as well as the tolerances of the verticality, symmetry and semi-linearity of the welded parts should be in accordance with the provisions of the table!
Basic size is
>50100
2509-4000
Plane
Axis, multiplication, symmetry
Parallel
5.5Joint and weld
JB/T 9873-1999
5.5.1 The basic form and size of the welded joint shall comply with the provisions of GB/T985 or the sample. 5.5.2 The weld groove surface shall not have cracks, delamination and impurities and other metallurgical defects. The weld groove of the fire-increased cutting shall be cleaned of the surface of the welded joint.
5.5.3 The appearance of the welded joint shall generally comply with the provisions of Table 11. Not more than 0.5mm. Table 11
510-18
--18-30
5.5.4 Appearance The size of the weld along the length should generally comply with the provisions of Table 12. Table 12
>1R-30
5.5.5 Appearance The weld should be smooth or uniformly scale-like. Wave effect surface height
Width (single side) tolerance
5.5.The undercut of the butt weld shall not exceed one-fourth of the plate thickness, and the maximum shall not exceed 2mm1mm
5.5.? Important bearings shall be maintained. There shall not be more than one pore with a diameter of less than 2mm in any 100mm length, and the unwelded depth shall not exceed 15% of the parent material wall thickness. The undercut depth shall not exceed 5% of the parent material thickness, and the maximum shall not exceed 1.5mm: the undercut length shall not exceed 10% of the total length of the seam
5.5.8: No cracks are allowed to appear in the continuous welding, and no interruption is allowed in the continuous welding. 5.5.9 The welding of normal pressure containers such as oil tanks and oil pools is not allowed to have braids or leaks. 5.5.10 The quality control regulations of oil welding shall be followed. 5.6 For welds that need to be tested for mechanical properties, the provisions of GB 2649 shall be followed. The steel grade, thickness, type of forging, welding specification, welding method and heat treatment of the test plate shall be completely the same as those of the welded parts. 5. Important welded parts shall be subjected to stress relief treatment. 6 Inspection method
6.1 The external quality of the welded parts shall be inspected by daily measurement method. 6.1 The size, shape and position errors of welded parts, components and welding parts shall be inspected by general or special single and special inspection tools: 6.3 The external defects of the weld shall be inspected by visual inspection or low-definition microscope. Internal defects can be reported according to the company's requirements by ultrasonic method, magnetic flaw detection method, drilling method or according to GB 3323/JB/9873-1999/6.4 The tightness of the weld can be tested by drying, water or other equivalent methods. The special test method with kerosene is to apply white powder water-soluble on one side of the weld, and then apply kerosene on the other side after drying; after 15-20m, if there is no oil spot or oil belt on the white powder, it is qualified. When conducting kerosene leak test, the ambient temperature shall not be lower than 5.6.5 The durability of the chain is generally tested by water pressure (or compressed air). The pressure of the water pressure test shall not be lower than 1.5 of the working pressure, and the holding time shall not be less than 5 minutes.
6.6 The mechanical property test of the seam shall be carried out according to the force method specified in GB/T2650, GB/T2651, GB/T2653, GBT2654 and GB/T2656.
Acceptance rules
1 The welded parts and components shall be inspected and accepted according to the drawings and process specifications in accordance with this standard. 7.2 The appearance quality of the welded parts shall be inspected one by one. Those that do not meet the requirements can be repaired and are still qualified products after inspection.3 The main dimensions of important welded parts shall be inspected piece by piece. Generally, 10%-30% of the general parts shall be sold in each batch, but not less than one piece. If a major dimension of a part is found to be unqualified during spot check, it shall be rechecked for several times. If it is still unqualified, all parts shall be checked. 4. The dimensions and surface quality of important load-bearing welding and appearance of the furnace shall be checked separately, and other parts shall be checked. The number of spot checks shall be the same as that of standard 7.1.
7.5 The items, numbers and technical indicators of the internal quality and mechanical properties of the coal seam shall be checked according to the drawings and the provisions of the following documents. Oil, water and high-pressure containers shall be checked for leakage or pressure resistance.
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