Welding process is a method of joining two or more metal parts by using heat and pressure.Heat generated by electric arc, resistance or other process melts the two parts and fuses them together, and then applying pressure joins them together. Compared to other joining processes, welding is generally easier to implement and often results in a higher quality joint.
JGJ81-2002 Building Steel Structure Welding Technical Regulations (Part 2) describes specific requirements for steel structure welding products in engineering. This part is a mandatory part of engineering design and construction.
1. Workmanship Requirements
a. Welders, workers and supervisors should have appropriate qualifications and meet relevant requirements.
b. Welding must be performed in strict accordance with the welding process, and the welded joint must meet the design requirements.
c. The welder must be qualified prior to welding.
d. The welding process should be thoroughly inspected and approved before welding commences.
e. All welding records should be kept.
2. Welding Material Requirements
a. Welding materials should meet the relevant standards and have certificates.
b. Welding materials should not be deliberately contaminated, and should be stored in a safe place.
c. The use of shielded gas and welding wire should be in accordance with the requirements.
3. Process Requirements
a. Basic welding process parameters, welding parameters and other welding related requirements should be clearly specified.
b. The welding process should be performed in accordance with the specified requirements, and should meet the design requirements.
c. The welding process should be checked and approved before welding commences.
d. Accurate records of welding parameters and inspection results should be kept.
e. All welds should be inspected and approve as per conditions specified in the relevant engineering design.
4. Quality Requirements
a. The welds should be made in accordance with the engineering design and requirements.
b. The welds should be clean, free from defects and joints should be of proper shape.
c. The welds should be checked and approved as per the requirements specified in the relevant engineering design.
d. All welding welded structures should be inspected and tested before they are put into service.
5. Safety Requirements
a. The welding environment should be regularly inspected and safe working conditions ensured at all times.
b. Appropriate personal protective equipment (PPE) should be used by all personnel at all times.
c. All personnel should be properly trained and understand the risks and hazards associated with welding.
d. Spare parts should be inspected and replaced as necessary.
e. Only qualified welders should be allowed to weld.
f. All timber and combustible materials should be kept clear from welding works.
In summary, JGJ81-2002 Building Steel Structure Welding Technical Regulations (Part 2) provides stringent requirements for welding products in engineering, in order to ensure that they are of a high quality and that risks and hazards are minimized. Adherence to this Technical Regulations will help ensure the safe operation of engineering steel structures and the overall quality of engineering projects.
