Metenger & MikeHalloran thanks for your replies.
The silencer is sch 10. The lug/tag serves as sliding/movement stop and also for futureremoval. I am also interested in how does the high operating temperature affect the lug/tab properties under service conditions.
Can anyone please offer advice on welding a lug or tab to a muffler/silencer that can reach 1200 degree F under operating conditions? Thanks in advance.