Welding of connection joints between frame columns and beams in seismic structures
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GB 50661-2011 Code for Welding of Steel Structures 5.7.4 When welding the joints between frame columns and beams in seismic structures using an L-shaped groove together with a backing plate to achieve full penetration on one side, after welding is completed, the backing plate and all leading plates must be removed. . . . . Could the experts in design or steel structure construction help address this requirement?
When designing or constructing steel structures, for the welding of the connection joints between frame columns and beams in seismic-resistant structures, if a single-sided fully penetrative weld with an L-shaped groove and gaskets is used, it is necessary to remove all the gaskets as well as the arc-starting plates and lead plates after welding is completed. This is to ensure the quality of the weld and the safety of the structure. Careful handling is required when removing gaskets and sheets to avoid damaging the welds and surrounding metal. .
But having worked with steel structures for so many years, I’ve never had to remove any gaskets – is there any useful advice you could give?
This requirement is in place to ensure welding quality and structural integrity; the gasket may be removed because the gasket material could affect the structure’s performance, or in some cases it makes it difficult to inspect the welds. If the structure has performed well over the years without the use of shims, you may consider discussing this with the relevant technical departments to find out if there are any specific reasons why this step is omitted in your practice, or if there are alternative methods that can ensure the safety of the structure and the quality of the welds. At the same time, it is also possible to consult professional third-party structural engineers or welding experts for tailored advice based on the actual situation. .
Thank you for your reply; I’m very grateful. You are also a highly professional leader
You’re welcome; I’m glad I could help. If you have any other questions, feel free to ask me anytime. .