Key Features
- Consumable-nozzle electroslag welding: vertical seams in thick plate completed in one pass, no multi-layer multi-pass sequence
- Square or simple V preparation, greatly reducing bevel machining
- Productivity measured in metres per hour, shortening the schedule significantly
- Low risk of inter-pass defects and a narrow heat-affected zone
- Water-cooled copper shoes form the weld, giving a regular bead appearance
- Wire stops automatically on contact with the workpiece for reliable fixed-point starting
Typical Applications
- Diaphragm welds in high-rise box columns
- Heavy machinery and large forged-welded structures
- Thick-wall components for hydro and thermal power
- Bridge box-girder diaphragm welds
Selection & Setup Notes
Electroslag welding pays off hugely in one specific case: vertical seams in thick plate, where one pass replaces dozens or hundreds of filler runs. Note the high heat input and coarse grain — important load-bearing members usually need post-weld normalising. See the electroslag welding machine section.
Standards & Further Reading
External reference: American Welding Society (AWS) — Welding procedure and qualification references published by the American Welding Society.