Tubular upper arms-I feel lucky tonight

I have some that i havn't installed yet. Don't know the brand as i bought them new from another guy who ordered the wrong ones. They have the same silver R/L sticker in the same place, but the pivots are thinner. So now i'm a bit worried. Is there any way of telling if they have been MIG or TIG welded?

BTW, 72bluNblu, nice info on the UCA story, thanks