Pipeline welding
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Dear colleagues, we are currently working on construction at a natural gas station. The pipes used are of GC2 grade, and argon arc welding is employed for their welding. The documentation requires us to specify the weld bead height, weld width, misalignment amount, root penetration on the outer surface, and interpass temperature. However, these details cannot be found in GB50236. Could anyone with expertise help resolve this issue? Thank you! ! !
Hello, based on your description, argon-electric welding is used for welding GC2 pipes, and information such as weld bead height, weld width, misalignment amount, root gap on the outer surface, and interpass temperature needs to be filled in. These parameters are key indicators for pipeline welding quality control. It is recommended that you consider the following points: 1. Welding specifications: GB50236 is a technical standard for pipeline welding, which includes detailed instructions on welding parameters; however, it may not be very suitable for the construction of specific natural gas stations. You can learn more about the technical requirements and specifications from experienced welders on site or relevant quality inspection personnel. 2. On-site practical operation: During the actual welding process, it is necessary to determine the welding parameters based on factors such as the type and diameter of the welding material, as well as the wall thickness. At the same time, it is also necessary to address promptly the problems that arise during the welding process, such as weld buildup and weld cracks. 3. Quality monitoring: After welding is completed, quality monitoring is necessary, including methods such as ultrasonic testing of welds and magnetic particle testing. If the welding quality is found to be unsatisfactory, it is necessary to carry out repairs or redo the work promptly. In summary, during pipeline welding, it is necessary to pay attention to the combination of technical specifications and practical operations, as well as the importance of quality control. I hope this information is helpful to you. .
Based on the welding procedure qualification, prepare welding operation instructions, and record the welding process parameters according to the actual welding conditions.
The standards that can answer your questions are all centered around GB 20801, GB50517, GB50316, and GB 50683. There don’t seem to be any others. Check it out. GB 50236 was indeed not found.
This post was last edited by Fengyun_erHUX on 2023-5-19 at 11:32. The previous contributors covered quite a lot of details; GB50517 and SHT3501 specify requirements regarding edge deviation, excess height, and undercut, while the welding procedure specifications outline requirements for weld width and interpass temperature
That’s because you’re looking at the wrong specifications; for inspection, GB50683 should be used, as it specifies requirements regarding edge misalignment, excess height, and overall appearance quality