Question: Issues regarding the welding between the checkered steel plate on the equipment’s steel platform and the supports.

Generally, the welding of steel platforms for equipment should be designed and constructed in accordance with **standard GB50017-2017 “Code for Design of Steel Structures”. There are regulations regarding the intermittent length of welding, as follows: 1. For the connection between patterned steel plates and channel steel (or angle steel), the intermittent length should not be less than 50 mm, and the distance between the centers of the welds should be less than or equal to 150 mm ； 2. For the welding between the steel grating and the supports, the intermittent length should not be less than 100 mm, and the distance between the centers of the welds should be less than or equal to 300 mm. The above provisions are for reference only; actual construction should be carried out according to the actual circumstances and design requirements. At the same time, during the welding process, it is also necessary to ensure the quality and strength of the welds, in order to avoid defects such as weld cracks. .

First of all, thank you for your advice. Regarding patterned steel plates or grating plates, how much should be welded to the lower peripheral supports? Regarding the issue of how much space is available, I don’t seem to have found any information in the above specifications. Excuse me, are there any specific regulations in this regard?

Regarding the welding between patterned steel plates, or grid plates, and the lower peripheral supports, **from a standard perspective, there are currently no specific regulations regarding the length of welding interruptions. Therefore, this issue actually focuses more on the need for designers and construction teams to take into account the following factors when inspecting the site in order to make a judgment: 1. Stress conditions: Interrupted welding should enable normal interlocking while not affecting the normal stress distribution under use ； 2. Equipment purpose: Determine the spacing for intermittent welding based on the equipment’s purpose and experience, in order to ensure safety, stability, and comfort ； 3. Requirements for technical standards, construction drawings, and other documents related to the project. Under normal circumstances, the welding interruption length can be determined based on experience and actual conditions. A common spacing is to weld one section and then leave a gap of 50–100 mm; this helps reduce the linear thermal expansion and contraction of the welds, thereby aiding in the elimination of residual welding stresses. It should be noted, however, that when performing intermittent welding, the welding and stopping positions should be as even as possible to ensure the quality and strength of the entire weld. Finally, if there are any special requirements regarding inspection, acceptance, and supervision, it is possible to communicate with the relevant departments to establish specific plans and restrictions. .

I work in the steel structure industry; I’m just sharing my insights for reference and discussion. Relevant standards for steel grilles: GB/T37256-2018, YB/T4001.1-2019. The channel steel or angle steel supports you mentioned likely refer to the edge banding. Trim band: Weld the carrying flat bars at intervals of 4 bars each, with the spacing not exceeding 150 mm. Load-carrying band: The load-carrying band plate must be welded to each load-carrying flat steel bar; welding should not be done intermittently. The weld shall be a fillet weld with a size not less than the thickness of the flat steel bar, and the maximum weld height is 6 mm. Stair treads and some heavy-load applications should be fully welded on both sides. As for the patterned plates, please have the relevant colleagues provide further information.