This standard specifies the technical requirements, test methods and inspection rules for light industrial machinery welded parts. This standard applies to light industrial machinery welded parts made of carbon structural steel, low alloy structural steel and stainless steel by arc welding, gas shielded welding and other methods. Other welding materials and welding methods can also be used for reference. This standard does not apply to pressure vessels. QB/T 1588.1-1992 General Technical Conditions for Light Industrial Machinery Welded Parts QB/T1588.1-1992 Standard Download Decompression Password: www.bzxz.net

Light Industry Industry Standard of the People's Republic of China
Light Industry Machinery
General Technical Conditions for Welded Parts
1 Main Contents and Scope of Application
This standard specifies the technical requirements, test methods and inspection rules for welded parts of light industry machinery. QB/T 1588.1—1992
This standard applies to welded parts of light industry machinery made of carbon structural steel, low alloy structural steel and stainless steel by arc welding, gas shielded welding and other methods. Other welding materials and welding methods may also be used for reference. This standard does not apply to pressure vessels.
2 Reference standards
GB/T324
GB/T983
GB/T 985
GB/T986
GB/T 2649
GB/T2650
GB/T2651
GB/T2653
GB/T2654
GB/T2655
GB/T 2656
GB/T 3323
GB/T3375
GB/T 5117
GB/T 5118
3 Terminology
Symbols for welds
Stainless steel welding rods
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 weldingMethods for sampling for mechanical property tests of welded jointsMethods for impact tests of welded joints
Methods for tensile tests of welded jointsbzxZ.net
Methods for bending and flattening tests of welded joints
Methods for testing hardness of welded joints and cladding metalTest methods for strain aging sensitivity of welded jointsFatigue tests of weld metal and welded jointsRadiography and quality grading of steel fusion welded butt jointsWelding terminology
Carbon steel welding rods
Low alloy steel welding rods
Terms shall comply with the provisions of GB/T3375.
4 Technical requirements
4.1 Basic requirements
4.1.1 Welded parts shall comply with the provisions of drawings, process documents and relevant standards approved through the prescribed procedures. 4.1.2 The steel grade, specification and mechanical properties of the base material of the welded part shall comply with the provisions of relevant standards. 4.1.3 The welding rod shall comply with the provisions of GB/T5117, GB/T5118, GB/T983 and relevant standards. 4.1.4 The weld size symbols and their markings on the drawings shall comply with the provisions of GB/T324. Approved by the Ministry of Light Industry of the People's Republic of China on August 31, 1992. Implemented on April 1, 1993. 4.2 Requirements for blanking parts. 4.2.1 The blanking of plates shall meet the following requirements: QB/T 1588. 1—1992. The flatness tolerance of the plate plane shall not be greater than 2 mm within any 1000 mm length, and the tolerance value within the entire length range shall comply with the provisions of Table 1. Long side dimension of plate: >1 000~~1 600 >1 600~2 500 >2 500~4 000 >4 000~6 300
Plate thickness
>3～14
The tolerances of parallelism, perpendicularity and straightness between plate edges shall comply with the provisions of Table 2Table 2
Cutting size
>500～1 000
>1 000～1 600
>1 600~2 500
>2 500~～4000
Cutting of profiles shall comply with the following requirements:
Parallelism
Verticality
The longitudinal straightness of the profile and the perpendicularity tolerance between each vertical surface shall comply with the provisions of Table 3, Table 3
Cutting size
Straightness
Vertical
>500～1 000
The flatness tolerance of each plane of the profile shall comply with the provisions of Table 4. Table 4
Profile length
>2 000
>1 000~1 600
>1 600~～2 500
Straightness
≥2 500～4 000
4.2.3 The cutting of the parent material can be done by mechanical cutting or flame cutting. When the thickness is greater than 16mm, flame cutting is recommended. 4.2.3.1 Flame cutting shall meet the following requirements: a.
The dimensional deviation of flame cutting shall meet the requirements of Table 5; 9
Cutting size
>500～1 000
>1 000～1 600
>1 600～2 500
>2 500～4 000
>4 000~6 300
QB/T1588.1—1992
For parts not requiring cutting
>20～40
>40～60
The verticality tolerance of the flame-cut surface to the plate and profile plane shall comply with the provisions of Table 6; Table 6
Plate thickness
>8～20
>20～40
>40～60
Profile height
>50～100
>100～200
For parts requiring cutting
>20～40
Verticality
For parts not requiring cutting, the depth of the cut on the flame-cut surface shall not be greater than the provisions of Table 7. c.
Sheet thickness
>20～40
>40~60
4.2.3.2 Mechanical cutting requirements
Manual flame cutting
The dimensional deviation of mechanical cutting shall comply with the provisions of Table 8; Table 8
For cutting without cutting
Cutting size
>500～1000
>1 000~1 600
>1 600～2 500
>2 500~4 000
>3～8
Mechanical flame cutting
For cutting
>3～8
>40～60
>8～14
QB/T1588.1--1992
b, for parts that do not require cutting, there should be no burrs higher than 0.5mm on the cutting surface of mechanical cutting. 4.2.3.3 The deviation of the angle cutting of parts is determined by the corresponding dimensional deviation. 4.2.4 Other technical requirements for plates and profiles shall comply with the provisions of drawings or technical documents. 4.3 Requirements for welded parts
4.3.1 All welded parts must be inspected and qualified before they can be assembled. During assembly, no strong correction shall be used. 4.3.2 Before welding, the oxide scale, oil stains, paint skin and other dirt on the surface of the parent material should be removed. 4.3.3 The surface of the welded part shall not have defects such as hammer marks, weld nodules, metal splashes and traces of lead. The sharp corners of the edges shall be smooth, the surface splashes shall be cleaned and the weld shall be leveled.
Requirements:
The positioning weld welded before welding for assembling and fixing the position of the welded joint shall be part of the subsequent weld. And meet the following requirements: The height and width of the positioning weld key shall not exceed the size of the actual weld. The positioning weld and the formal weld must use the same brand of welding rod; when the positioning weld has cracks, it must be scraped off and re-welded. 4.3.5 Requirements for welded joints and welds
4.3.5.1 The basic type and size of the welded joint shall comply with the provisions of GB/T985, GB/T986 or the drawings. 4.3.5.2 The surface of the welding groove shall not have metallurgical defects such as cracks, delamination, inclusions, etc. The groove cut by flame shall be cleaned of slag, oxide scale, etc.
4.3.5.3 The weld should be smooth or have a uniform scaly corrugated surface. The uniformity of the dimensions along the weld width should comply with the requirements of Table 9. See Figure 1.
Weld width C
>20-30
Single side width deviation h
4.3.5.4 The weld excess height h (see Figure 2) of the non-machined surface should not be greater than that specified in Table 10. Table 10
Weld trueness C
Weld excess height
QB/T1588.1—1992
4.3.5.5 The weld is not allowed to have defects such as burn-through, cracks, discontinuities, pits, etc. 4.3.5.6
In any 100mm length, there shall not be more than one pore with a diameter not greater than 2mm in important load-bearing welds. 4.3.5.7
The incomplete penetration depth t of important load-bearing welds shall not exceed 15% of the thinner parent metal wall thickness? (see Figure 3). Figure 3
4.3.5.8The undercut length of important load-bearing welds shall not exceed 10% of the total length of the weld. The undercut depth (A8) shall not exceed the provisions of Table 11 (see Figure 4).
Thinner parent metal wall thickness
>10～40
4.3.5.9The misalignment of butt welds shall not exceed one-fourth of the plate thickness and shall not exceed 2mm at most. 4.3.5.10 Leakage is not allowed in welded parts of container products. 4.3.6The dimensional deviation of welded parts shall comply with the provisions of Table 12. 12
Basic size
>500～1 000
>1 000～1 600
>1 600～2 500
>2 500～4 000
>4 000~6 300
QB/T1588.1--1992
For strip cutting
Note: When it is necessary to improve the accuracy requirements, it should be indicated in the process documents. The angular deviation of welded parts shall comply with the provisions of Table 13. 4.3.7
Size range (short side length)/mm
≤315
>315～1 000
For machining without cutting
Limit deviation
±45″
4.3.8 The flatness tolerance of welded parts surface, as well as the tolerances of coaxiality, verticality, symmetry and parallelism of relevant parts shall comply with the provisions of Table 14.
Basic size
>500～1 000
>1 000～1 600
>1 600～2 500
>2 500~4 000
≥4 000~6 300
Coaxiality, verticality, symmetry
4.3.9 Important welds shall be subjected to mechanical property tests in accordance with the provisions of GB/T2649. 4.3.10 Important welding parts shall be subjected to stress relief treatment. 5 Test methods
The appearance quality of welded parts is generally inspected by visual inspection and shall comply with the provisions of Articles 4.3.3, 4.3.5.2 and 4.3.5.3. 5.1
The size, shape and position errors of parent materials, weldments and welds shall be inspected with general or special measuring tools. It shall comply with Articles 4.2, 4.3.5.15.2
, 4.3.5.3, 4.3.5.4, 4.3.5.8, 4.3.5.9, 4.3.6, 4.3.7 and 4.3.8. 5.3 External defects of welds shall be observed visually or with a low-power magnifying glass. Internal defects may be inspected by ultrasonic method, magnetic flaw detection method, drilling method or in accordance with GB/T3323 according to different requirements. It shall comply with the provisions of 4.3.5.5, 4.3.5.6 and 4.3.5.7. 5.4 The sealing of the container shall be checked for leakage using kerosene or other equivalent methods and shall comply with the provisions of 4.3 and 5.10. 5.5 The mechanical property test of welds shall be carried out in accordance with the provisions of GB/T2650, GB/T2651, GB/T2653, GB/T2654, GB/T2655 and GB/T13
2656. It shall comply with the provisions of 4.3.9. 6 Inspection rules
QB/T 1588.1--1992
6.1 Welded parts shall be inspected and accepted according to this standard and the corresponding drawings and process documents. 6.2 The appearance quality of welded parts shall be inspected piece by piece. Those that do not meet the requirements may be repaired, and after inspection, they are still qualified products. 6.3 The main dimensions of important welded parts shall be inspected piece by piece, and 10% to 30% of general welded parts shall be randomly inspected per batch. However, there shall be no less than three pieces. If the main dimensions of one piece are found to be unqualified during the random inspection, the number shall be doubled for re-inspection. If there are still unqualified ones, all of them shall be inspected. 6.4 The dimensions and surface quality of important load-bearing welds and appearance welds shall be inspected item by item. Other welds shall be randomly inspected, and the number of random inspections shall be the same as that of Article 6.3.
6.5 The items, quantity and technical indicators of the internal quality and mechanical properties of welds shall be inspected in accordance with the provisions of the drawings and process documents. Additional remarks:
This standard is proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by the Light Industry Machinery Design Institute of the Ministry of Light Industry, the Hunan Light Industry Machinery Factory, and the Jingdezhen Ceramic Machinery Factory of Jiangxi Province.
The main drafters of this standard are Lang Huiqin, Gong Liang, and Liu Juanqing. From the date of implementation of this standard, the former Ministry of Light Industry of the People's Republic of China issued the Ministry of Light Industry Standard QB/T842.4-1982 "General Technical Conditions for Welded Parts of Light Industry Machinery Weighing Instruments" will be invalidated. 143 The main dimensions of important welded parts shall be checked piece by piece, and 10% to 30% of each batch of general welded parts shall be randomly checked. However, it shall not be less than three pieces. If the main dimensions of one piece are found to be unqualified during the random inspection, the number shall be doubled for re-inspection. If there are still unqualified ones, all of them shall be inspected. 6.4 The dimensions and surface quality of important load-bearing welds and appearance welds shall be checked item by item. Other welds shall be randomly inspected, and the number of random inspections is the same as that of Article 6.3.
6.5 The items, quantity and technical indicators of the internal quality and mechanical properties of welds shall be inspected in accordance with the provisions of the drawings and process documents. Additional remarks:
This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by the Hangzhou Light Industry Machinery Design Institute of the Ministry of Light Industry, Hunan Light Industry Machinery Factory, and Jingdezhen Ceramic Machinery Factory of Jiangxi Province.
The main drafters of this standard are Lang Huiqin, Gong Liang, and Liu Juanqing. From the date of implementation of this standard, the former Ministry of Light Industry of the People's Republic of China issued the Ministry of Standard QB/T842.4-1982 "General Technical Conditions for Welded Parts of Light Industry Machinery Weighing Instruments" will be invalidated.3 The main dimensions of important welded parts shall be checked piece by piece, and 10% to 30% of each batch of general welded parts shall be randomly checked. However, it shall not be less than three pieces. If the main dimensions of one piece are found to be unqualified during the random inspection, the number shall be doubled for re-inspection. If there are still unqualified ones, all of them shall be inspected. 6.4 The dimensions and surface quality of important load-bearing welds and appearance welds shall be checked item by item. Other welds shall be randomly inspected, and the number of random inspections is the same as that of Article 6.3.
6.5 The items, quantity and technical indicators of the internal quality and mechanical properties of welds shall be inspected in accordance with the provisions of the drawings and process documents. Additional remarks:
This standard was proposed by the Technical Equipment Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Light Industry Machinery Standardization Center. This standard was drafted by the Hangzhou Light Industry Machinery Design Institute of the Ministry of Light Industry, Hunan Light Industry Machinery Factory, and Jingdezhen Ceramic Machinery Factory of Jiangxi Province.
The main drafters of this standard are Lang Huiqin, Gong Liang, and Liu Juanqing. From the date of implementation of this standard, the former Ministry of Light Industry of the People's Republic of China issued the Ministry of Standard QB/T842.4-1982 "General Technical Conditions for Welded Parts of Light Industry Machinery Weighing Instruments" will be invalidated.
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