How it differs from other welding
Lead welding fuses the lead sheets themselves together using a lead filler rod and controlled heat, rather than bonding with an external adhesive or sealant that can degrade over time.
When welding is the right technique
Welding is used to join large sheets, repair splits, and form durable seams at rolls and drips — anywhere a mechanical joint alone wouldn't be reliably watertight long-term.
Skill and experience required
Lead welding done poorly can weaken the surrounding lead through overheating, so it's a technique that benefits significantly from an experienced hand rather than a quick fix.