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Excuse me, do you need to leave a gap or weld tightly between two three thick angle irons as shown in the figure?
This welding belongs to butt welding. Considering that the thickness is only 3mm, it is suggested to leave a gap of about 1mm for welding. If the welding level is good, the effect of single-sided welding and double-sided forming can be achieved.

Note: this large-area welding will destroy the internal stress of the profile, and bending deformation will occur after welding.