Metal Structural Welding Technology Regulation according to JGJ81–2002
Welding is a complex process and requires a specialized set of skills and expertise. To ensure that all welders produce the highest quality weldments, there is a need for a standardized and detailed welding code. The Chinese Ministry of Housing and Urban-Rural Development has established the “JGJ81–2002 Buildings Steel Structure Welding Technical Regulation” in order to ensure safety and promote efficiency of the welding process.
This welding code covers all aspects of the process from design and fabrication to testing and inspection. It outlines requirements such as the allowance and tolerances of welders, the approved welding techniques, cored electrodes and filler metals, the minimum welded area, the joint weld quality, and the maximum welding current. The code also states requirements for flame cutting, grinding and slow-arc welding.
The JGJ81–2002 Building Steel Structure Welding Technical Regulation states that no welding should be attempted without the necessary protective gear, such as eye protection and proper clothing. The welding equipment must also be verified and approved. In order to ensure the highest weld quality, proper weld preparations must be followed, including preheating and postheating, interpass cleanliness, weld joint design and penetration, and grinding specifications. Other requirements such as number of elements (such as welders) and pre-weld assembly work must be considered in order to meet the established weldment performance requirements.
The code also states the importance of proper weld inspection and acceptance criteria. The type and scope of weld inspections shall also depend on the welding process and test methods used. There are specific requirements for visual inspection, slag inclusion, undercut, and fusion acceptance. Other areas covered by the code include welding sequence, welded joint access, reduced thickness areas, welding in the presence of contaminants, welding the wrong joint (non-approved joints), and the requirements concerning the installation of welding machines.
In conclusion, it is essential to comply with the JGJ81–2002 Buildings Steel Structure Welding Technical Regulation in order to produce weldments that are structurally sound and meet the highest industry expectations. It is also a good practice to regularly monitor weld inspection results in order to ensure that established acceptance criteria are being met. This will enable organizations to optimize their welding process while maintaining the same level of quality.
