Submerged Arc WeldingSubmerged Arc Welding

SAW Flux / Filler Metal Compositions

F7A2-EM12K• F indicates flux

– 70-95 ksi UTS, 58 ksi minimum yield strength, 22% elongation

– A - as welded; P - postweld heat treated– 2 - minimum impact properties of 20 ft-lbs @ 20°F

• E indicates electrode (EC - composite electrode)– M - medium manganese per AWS Specifications– 12 - 0.12% nominal carbon content in electrode– K - produced from a heat of aluminum killed steel

Advantages• High deposition rates• No arc flash or glare• Minimal smoke and fumes• Flux and wire added

separately - extra dimension of control

• Easily automated• Joints can be prepared with

narrow grooves• Can be used to weld carbon

steels, low alloy steels, stainless steels, chromium-molybdenum steels, nickel base alloys

Submerged Arc Welding

Limitations• Flux obstructs view of

joint during welding• Flux is subject to

contaminationporosity• Normally not suitable for

thin material• Restricted to the flat

position for grooves - flat and horizontal for fillets

• Slag removal required• Flux handling equipment

Submerged Arc Welding