Steps for Welding Steel Structures According to JGJ 81-2002
Welding of steel structures is an important process in the construction and manufacturing industry. In the past, welding processes were largely undocumented and the industry relied on trial and error methods of welding that were often time consuming, expensive and error prone. The development of JGJ 81-2002 has brought a new level of standardisation and definition to the welding of steel structures, offering a more efficient and consistent method of welding. This article will discuss the steps for welding steel structures according to JGJ 81-2002.
The first step in welding steel structures according to JGJ 81-2002 is to ensure that the site is suitable for welding. The site should be free of debris and debris-forming materials such as oil and grease, and protected from external sources of contamination. All equipment used for the welding process must also be clean and free of contaminants.
The next step is to inspect the materials and components which will be used in the welding process. All materials must be in accordance with JGJ 81-2002 and be suitable for welding. Any damage caused during storage or transport should be removed and repaired before beginning the welding process.
Once the site is prepared and all materials are inspected, the welder can begin setting up the welding equipment. The equipment should be set up according to manufacturers instructions and in accordance with JGJ 81-2002. All equipment must be inspected before it is used in the welding process to make sure it is in correct working order.
The fourth step in welding steel structures according to JGJ 81-2002 is to prepare the welding environment. This includes the use of proper shielding gases, cleaning of the joint and any other environmental concerns that should be taken into consideration. All measures taken must be in accordance with manufacturers instructions.
The fifth step is the actual welding. All welding operations such as preheating, interpass temperatures and post-welding treatments must be carried out in accordance with manufacturers instructions. This includes the use of suitable equipment and processes such as shielded metal arc welding, gas metal arc welding, flux-cored arc welding, manual metal arc welding and other methods.
Finally, an inspection of the welded steel structure should be carried out. Visual and metallurgical testing should be used to assure the weld is of the highest quality and meets all the requirements of JGJ 81-2002. All non-destructive testing should be in accordance with approved standards.
Welding steel structures according to JGJ 81-2002 is a complex process that requires careful preparation, proper equipment and materials, and the use of approved methods and processes. Following these steps can ensure the welding process is completed efficiently, safely and to the highest standard possible.
