Can direct welding of the layers in a stainless steel composite panel ensure strength?
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I would like to ask: there is a square steel tube made by rolling and welding stainless steel composite sheets (the welding specifications for such square steel tubes are clear, so there are no issues). The material composition is S30408+Q345B+S30408, and the thickness is δ1+8+1 ； There is another connector made of the same material as well ； The connectors and square steel tubes are placed together (with the layers facing each other), and welding is carried out around them (as shown in the drawings). Can stainless steel welding electrodes be used for welding the layers? It is also said that welding only the cladding layer poses a risk of it coming off, as the welding strength cannot be guaranteed; it is necessary to remove the cladding layer and combine it with the base layer, and then add a transition layer and a cladding layer again. Thank you; this relates to the use of stainless steel composite materials in structural applications
The icon for 1-1 is incorrect; the thickness of the connector is not 20, it should be 1+8+1=10mm
The specifications for butt welding of square steel tubes rolled together are quite clear; however, this specification does not cover the form of corner welding such as 1-1. I would be extremely grateful if someone could help answer this question
Rectangular fillet welds are primarily subjected to shear forces, so their stress state is not considered complex. Could there be delamination or tearing failure in such welds?
The square steel tubes are fixed to the beam using bolts through holes in the connectors; composite panels are used for corrosion protection (the client prefers this method for that purpose). In the past, painting or galvanizing was used, and such problems did not arise
This post was last edited by wanlirn on 2021-10-18 09:40. Welding it directly is definitely not safe; it’s okay to remove the overlay layer and then cover it with stainless steel welding rods
I’m also worried that direct layered welding might cause the material to come loose, after all, the load-bearing capacity of composite panels relies mainly on the base layer. This method works indeed, but it is a bit more complicated
May I ask, should the double layer be removed first, then the base layer be welded using carbon steel electrodes, and finally the surface layer be welded using stainless steel electrodes? Should we use a transition layer welding rod for the transition?