What welding method is used for butt welding of 6mm 316L stainless steel plate?

It can be welded by manual argon arc welding (mtig) or CO2 welding method or manual welding rod.   

Manual argon arc welding: er316l welding wire, 2.5 thick or 3.2 thick, can be used; for 6mm thick plate, x-groove can be used. During welding, attention shall be paid to welding deformation, one on the front and one on the back, to offset the impact of welding deformation as much as possible.

CO2 welding method: if you want to get better results, you can use flux cored wire (E316LT) for welding. The reason for selecting the flux core is that the spatter is very small, the weld seam protection effect is good, but the price is relatively expensive. During the operation, pay attention to the operation of clearing the root between layers. The next welding shall be carried out after the coating is removed.

Manual electrode welding: manual electrode welding can also be used for treatment. Select A207 electrode for welding. Electrode welding also needs to carry out the operation of clearing the root between layers.