Speaking of soldering LMAO

Flat seamed metal roofing, cornices and such, downspouts, and flashing with returns. Electric irons are mostly used for sections and pieces made up in the shop for obvious reasons. Heavy iron like that is needed mostly for flat lock seams. Joseph Jenkins stocks American Beauty irons and a lot of related tools and materials.
SOLDERING DEVICES

TRADITIONAL ROOFING MAGAZINE - Issue #6 - Installing Flat Lock Soldered Copper Roofing

Electric iron video on this page.
TRADITIONAL ROOFING MAGAZINE - Issue #6 - Expansion Joints in Copper Box Gutters