JB/T 8609-1997 This standard is a revision of ZB J62 025-89 "Technical Conditions for Forging Machinery Welded Parts". This standard specifies the items, rules, methods and requirements for the inspection and acceptance of forging machinery welded parts. This standard applies to the inspection and acceptance of forging machinery welded parts made of carbon steel and low alloy steel by manual arc welding, submerged arc welding, gas shielded welding, gas welding and other methods. The dimensional tolerances and shape and position tolerances specified in this standard are also applicable to the inspection and acceptance of forging machinery welded parts manufactured by resistance welding. JB/T 8609-1997 Technical Conditions for Forging Machinery Welded Parts JB/T8609-1997 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T8609-1997
Forging Machinery Welding Parts
Published on August 18, 1997
Technical Conditions
Implemented on January 1, 1998
Ministry of Machinery Industry of the People's Republic of China
JB/T8609-1997
This standard is a revision of ZBJ62025-89 "Technical Conditions for Forging Machinery Welding Parts". ZBJ62025 is formulated with reference to advanced foreign welding standards. For some clauses, if the requirements are relaxed by adopting process measures, the welding quality can still be guaranteed. Corresponding modifications have also been made in this regard. The dimensional tolerances and shape and position tolerances of foreign forging machinery welded parts generally do not divide the basic dimensions into sections. In actual applications, it is found that it is not reasonable not to divide the size sections. For this reason, this standard still divides the basic dimensions into sections.
This standard has made necessary modifications to some restrictive clauses, increased the flexibility of operation, and only graded the dimensional tolerances and geometric tolerances of the components of welded parts, without specifying their scope of application. This standard has appropriately simplified the requirements for the components of welded parts, focusing on the requirements for plate parts to adapt to the characteristics of forging machinery welded parts.
This standard will replace ZBJ62025-89 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Forging Machinery Standardization. The responsible drafting unit of this standard is: Jinan Casting and Forging Machinery Research Institute of the Ministry of Machinery Industry. The participating drafting units of this standard are: Jinan Second Machine Tool Plant and Huangshi Forging Machine Tool Co., Ltd. The main drafters of this standard are: Liang Erquan, Wei Cunqi, and Jiang Xiaochi. 1 Scope
Machinery Industry Standards of the People's Republic of China
Forging Machinery Welded Parts
Technical Conditions
This standard specifies the items, rules, methods and requirements for the inspection and acceptance of forging machinery welded parts. JB/T8609-1997
Replaces ZBJ62025-89
This standard applies to the inspection and acceptance of forging machinery welded parts made of carbon steel and low alloy steel by manual arc welding, submerged arc welding, gas shielded welding, gas welding and other methods. The dimensional tolerances and shape and position tolerances specified in this standard are also applicable to the inspection and acceptance of forging machinery welded parts made by resistance welding.
2 Cited 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 parties using this standard should explore the possibility of using the latest versions of the following standards. GB 985-88
GB986-88
GB2649-89
GB2650-89
GB2651-89
GB2652-89
GB2653--89
GB2654-89
GB2655-89
GB2656--89
GB3323—87
GB11345-89
3 General requirements
3.1 Steel
Gas welding, manual arc welding and gas shielded welding Basic types and dimensions of weld groove Basic types and dimensions of weld groove for submerged arc welding Sampling method for mechanical property test of welded joints Impact test method for welded joints
Tensile test method for welded joints
Tensile test method for welds and deposited metal
Bending and flattening test method for welded joints
Hardness test method for welded joints and cladding metal Test method for strain aging sensitivity of welded joints Fatigue test method for weld metal and welded joints Radiography and quality grading of fusion welded butt joints Manual ultrasonic flaw detection method for steel welds and grading of flaw detection results 3.1.1 The steel used to manufacture welded parts must comply with the provisions of the product drawings. 3.1.2 The steel used to manufacture welded parts must comply with national standards or industry standards, have the quality certificate of the manufacturer, and must be inspected and accepted according to the regulations. Only after passing the inspection can it be used. 3.1.3 The internal quality of steel used as important welded parts should be checked, and there should be no unacceptable internal defects such as cracks, delamination and heavy skin. 3.2 Welding materials
Welding materials such as welding rods, welding wires, flux and welding gas must comply with national standards and relevant standards, have a quality certificate from the manufacturer, and be inspected and accepted according to regulations. They can only be used after they are qualified. 3.3 Components of welded parts
3.3.1 The dimensional tolerances of parts shall comply with the provisions of Table 1. Approved by the Ministry of Machinery Industry on August 18, 1997
Implementation on January 1, 1998
≤315
>315~1000
JB/T8609-1997
>1000～2000
>2000～4000
The type and size of welding grooves shall comply with the provisions of GB985 and GB986. The straightness tolerance of the edges of plate parts shall comply with the provisions of Table 2. Table 2
≤315
>315~1000
>1000～2000
The verticality tolerance of the end surface of plate parts shall comply with the provisions of Table 3. Table 3
Verticality tolerance
>2000～4000
>4000~8000
>4000～8000
6 is the thickness of the steel plate, and the verticality is the verticality along the thickness direction. The verticality tolerance and parallelism tolerance between the edges of plate parts shall not be greater than 50% of the corresponding size tolerance. The flatness tolerance of the surface of plate parts shall comply with the provisions of Table 4. Table 4
Plate thickness
>14~60
>14~60
Flatness tolerance within any 1000 length ≤1.5
Flatness tolerance within the entire length
Based on the flatness within the 1000 length, as the measuring length increases, the flatness increases by 0.5L/1000 (L is the length of the plate part)
When the length of the steel part is less than or equal to 1000mm, its straightness tolerance is 1.0mm, and when it is greater than 1000mm, its straightness tolerance is 1/1000 of its length and shall not be greater than 4.0mm. Its end face verticality tolerance shall not be greater than 50% of the corresponding size tolerance. 3.4 Assembly quality of welded parts
3.4.1 All parts must be inspected and can be assembled only after they pass the inspection. 3.4.2 The assembly of welded joints must comply with the provisions of GB985 and GB986. The root gap is uniform over the entire length and the tolerance should comply with the standard.
3.4.3 When plate parts are butt-jointed, the misalignment on both sides should be uniform. When the plate thickness is less than or equal to 14mm, the misalignment is 1.0mm. When the plate thickness is greater than 14mm, the misalignment is 2.0mm.
3.4.4 The misalignment of welded joints should comply with the provisions of Table 5. 2
Joint type
JB/T8609-1997
Manual welding
≤0.26 and ≤1.0
≤0.16 and 1.5
Automatic welding
≤0.18 and ≤1.5
0.18 and 1.5
2.0<≤+2.0
C is the overlap
3.4.5When assembling box-type structural weldments and other weldments with complex structures, the requirements of Table 6 shall be met. 3.4.6Rust, scale, oil stains and other substances on both sides of the weld and the surface of the groove must be cleaned up. The cleaning range on both sides of the weld is: a) not less than 10mm for manual arc welding;
b) not less than 20mm for submerged arc welding.
3.4.7 The tack welding of welded parts should use the same welding materials as the formal welding. The length of the tack welding weld is generally 5 to 30 mm, and the height and width shall not exceed the size of the weld after welding; the spacing of the tack welding is generally 50 to 300 mm, depending on the strength requirements, to ensure that there is no cracking during the welding process. If there are cracks or other unacceptable defects in the tack weld, they should be removed and re-welded. 3.4.8 After the assembly of the welded parts is completed, they must be inspected. There must be no mis-assembly or missing assembly. The overall size and shape and position tolerances must meet the requirements of the drawings. If there are any deviations, they must be corrected. Only after passing the inspection can the welding process be transferred. 3.5 Inspection during welding
3.5.1 The welder must weld in accordance with the provisions of the process documents. 3.5.2 For multi-layer (pass) welding of important welds, the bottom weld must be inspected after welding. The welder must conduct self-inspection for each layer (pass). If cracks, pores, slag inclusions and other unacceptable defects are found, they must be repaired in time and welding can be continued after they are qualified. Y
Structural type
JB/T8609-1997
Inspection items
Symmetry of external elements of box structure
(spacing tolerance)△b
Squareness of box structure (difference between diagonal
L>AL
≤1000bzxZ.net
Ab≤1.5;
1000
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