GB/T 33814-2017Welded H-section steel (English PDF)

4.1 Code

The code of welded H-section steel is WH, where "W" represents welded and "H" represents H-section steel.

4.2 Specification representation

The specification of welded H-section steel shall be expressed in the following form.

5.1 Dimension and representation method

5.3 Weight and permissible deviation

Welded H-section steel shall be delivered according to the theoretical weight (the theoretical weight shall be calculated regarding the density as 7.85 g/cm³).

Agreed upon between he supply and demand parties and specified in the contract, it may delivery according to the actual weight.

6.1 Steel

6.1.1 Steel used for welded H-section steel shall comply with the specifications of relevant standards such as GB/T 699, GB/T 700, GB/T 712, GB/T 714, GB/T 1591, GB/T 3274, GB/T 4171, GB/T 19879.

6.2 Welding materials

6.2.1 The welding material used for welded H-section steel shall comply with the specifications of relevant standards such as GB/T 2537, GB/T 4282, GB/T 5117, GB/T 5118, GB/T 5293, GB/T 8110, GB/T 10045, GB/T 12470, GB/T 17493.

6.3 Welding

6.3.1 When the thickness of the web of welded H-section steel is not greater than 20 mm, the web and the flange plate may be connected by fillet welds. The weld foot size hf shall meet the design requirements.

6.3.2 When the thickness of the web of welded H-section steel is greater than 20 mm, the web and flange plate should be connected by partially or fully welded butt joint and fillet joint combined welds. The weld quality grade shall be determined in accordance with the relevant specifications of GB 50661-2011.

6.3.6 Welding H-section steel can adopt welding methods such as submerged arc automatic welding (boat welding or flat fillet welding), solid welding wire or flux cored wire gas shielded welding, electrode arc welding, flux cored wire self-protective welding and their combinations. The welding method and the welding process shall meet the requirements of relevant standards.

6.4 Welding personnel

6.4.1 Welders engaged in the manufacture of welded H-section steel shall take technical qualification examinations according to the requirements of steel type, welding joint form, welding method, welding position, etc., and obtain the corresponding certificate of conformity. The certified welder shall weld within the recognize range of the certificate of conformity.

7.1 Inspection and acceptance

7.1.1 The Inspection and acceptance of welded H-section steel finished products shall be organized by the quality supervision department of the production organization.

7.2 Batching rules

The inspection batch of welded H-section steel shall be determined according to product specification, raw material and welding process. The same batch of welded H-section steel shall have the same specification, using steel and welding materials of the same grade (model), quality grade, delivery conditions, and using the same processing and welding process; each batch is not more than 300 t.

7.3 Sampling rules

7.3.1 The sampling method for the chemical composition inspection of welded H-section steel shall be in accordance with the relevant specifications of GB/T 20066. The sampling part and sampling method of the mechanical property test shall be in accordance with the relevant specifications of GB/T 2975.

7.3.3 The dimensions, shape and surface quality of welded H-section steel shall be checked one by one.

7.4 Finished product inspection

The inspection items, sampling quantity and test methods of welded H-section steel shall comply with the specifications of Table 4.

7.5 Welding inspection

7.5.1 Appearance inspection

7.5.1.1 All welds shall be cooled to ambient temperature for visual inspection.

7.5.1.4 The content and requirements of weld appearance dimension inspection shall comply with the specifications of Table 2 and Table 3.

7.5.2 Non-destructive testing

7.5.2.1 The non-destructive testing shall be carried out after passing the appearance inspection. Specifically, it shall comply with the relevant specifications of GB 50661-2011.

7.5.2.5 Radiation test method may be used to supplement the test as needed.

7.5.2.6 Radiation testing shall comply with the relevant specifications of GB/T 3323-2005. The quality grade of radiography shall comply with the requirements of Grade B. The qualification grade of Grade I welds shall be Grade II and above, and the qualification grade of Grade II welds shall be Grade III and above.

7.5.2.10 Penetration testing shall comply with the relevant specifications of JB/T 6062. The conformity criterion shall comply with the relevant specifications of the appearance inspection in Table 5.

7.6 Testing agencies and personnel

7.6.1 The third-party testing agency engaged in inspection shall pass the national laboratory accreditation or measurement certification and shall have the qualification for testing the corresponding items.