I just had a look on mine and they are definately welded together with a spot weld.
The two metal parts have gaps between them except where the spot weld joins them.
2012 Alpine White E92 335d M Sport LCI | Coral Red Dakota Leather | Media Package - BMW Professional | 313 Wheels | Evolved |
Previously - 2009 Alpine White 325d M Sport LCI | Auto + Paddles | Media Package - BMW Professional | BMW Performance Front, Sideskirts and 313P Wheels | Black Grilles |
Carbon Black E46 ///M3 '04 | Manual | Evolved |