Your wastegate when its closed will mean no leaks.. totally pointless welding all around the flap, it wont leak thats what its for... just the actuator lets it open when theres pressure. Tacking it shut would just be like holding the flap closed IE de-wastegating...
![[Image: 22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg]](http://i585.photobucket.com/albums/ss299/Ha11elujaz0rs/22f2b6b2-758b-4c1c-96fb-6fa9c6059b13_zpsf306b56b.jpg)