Welding is an essential part of building steel structure and a key process for building steel structure safety and integrity. In recent years, with the increasing scale and complexity of steel structures, it is not only necessary to further strengthen and improve the technology of welding production and application, but also to standardize the welding process and improve the quality of welding work. In order to ensure the quality of welding work and meet the structural design requirements, and ensure the reliability and stability of the structure, JGJ81-2002 has put forward very detailed requirements for welding production technology and welding quality inspection of steel structures.
The standard mainly covers: qualification and supervision of welding personnel; welding process, welding materials, welding procedures; welding production quality inspection parameters and inspection methods, quality control and guarantee of welding materials; weld acceptance criteria and inspection methods; welding repair, welding of cylinder and other complex shapes, welding stress relief and other processes.
First, the quality of welding personnel must meet the required level and meet the welding production requirements. In order to ensure that qualified welding personnel work in the welded structural parts of the steel structure, the standard proposes to implement the qualification and supervision management of welding personnel. The qualification of welders and welding operators should meet the requirements of the relevant national regulations, and the management of certification and supervision should be carried out in accordance with the regulations of the Ministry of Construction.
Second, the standard clearly puts forward the requirements for welding process, welding materials and welding procedures. Welding process includes manual welding, arc welding, submerged arc welding, furnace brazing, automatic welding and other processes. Welding materials include welding rods, welding flux, wire electrodes and other materials. Welding procedure refers to the operating procedures and process of welding joints, including the drawing of welding process parameters, the arrangement of welding sequence, the arrangement of welding layer structure and the precautions in welding process.
Third, the inspection parameters and methods of welding production quality are put forward in detail. The inspection items include: welding flux and wire electrode appearance, welding joint surface profile and shape, weld seam undercut, weld back gouging and weld slag inclusion, etc. The methods of inspection include visual inspection and measure inspection, etc.
Fourth, it puts forward the requirements for the quality control and guarantee of welding materials, the acceptance criteria and inspection methods for welds, the welding repairs, welding of cylinders and other complex shapes, welding stress relief and other processes. With regard to the quality control and warranty of welding materials, the welding materials used should be in accordance with the technical requirements and should be identified, numbered and stored separately; the welding seam shall pass X-ray or ultrasonic flaw detection according to the design requirements, and the welding defect acceptance criteria shall be determined according to the requirements of the relevant national standard.
In summary, JGJ81-2002 welding technology specification for steel structures has put forward very detailed requirements for welding production technology and welding quality inspection of steel structures. If we objectively understand and strictly implement the requirements put forward in this specification, the quality of welding work will be effectively improved, which is of great significance for ensuring the reliability and stability of the steel structure.
