Yeah, SIFs new site is a bit pants. They used to do hard copies (got mine free at local welding suppliers) with identical info to the old site, might still exist on the old format? If not i can scan and email the relevant bits if you want
Alcotec is probably the most detailed about for
aluminium alloys. Data sheets for the individual alloys too with more detail on uses etc. Save the pdfs just in case, before they revamped their site (something to do with esab) there was LOADS more valuable info available, all gone now
Same sort of stuff but for
magnesium alloys, again more detailed stuff and common applications for the various alloys on the main site including info on pre and post heats
TWI nickel alloys, there's similar pages for all the other alloy groups. The search function is bit pants, the knowledge section of the
SIF site has an index of the various job knowledge for welders pages though as well as couple of pdfs that survived the change but you've probably already found that
Not found anything even approaching the old SIF stuff for copper alloys