The pressing issue of edged angle steel
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Since the edge banding angle steel is 100X100X10, there are issues with arc pressing; it would be possible to first create an opening on the side that connects to the top plate and then shape it through pressing, before finally welding all the openings shut. I’m not sure if this will work, and whether the designer will approve it.
Doing this is unreasonable; the welding quality cannot be guaranteed, which affects strength and stiffness.
Edge banding angle steel can weld two symmetrical points together, and is formed using a sheet rolling machine. Of course, it is best to use a dedicated bending machine for processing.
The design standards do not specify the processing method for flanged angle steel, but your approach is not very reasonable; even after making cuts, there is still a problem with bending, and the core issue remains unresolved. Small-section cold bending and large-section hot bending are the solutions.