Hi Nev
let me say ,i am a very good welder ,but as my eyes are now getting weaker from over 45 years welding i would get a younger person yo do it, if you can get it welded (if you are not up spec) get a good welding shop to do it ,there is is not a lot of welding on most planes but it does need to be welded correctly eg the right consumables, temps ,material or as Scotty says ,go do the welding course it will be of great benifit
Cheers (From a retired boilermaker/welder) Gareth