submerged arc welding. saw flux / filler metal compositions f7a2-em12k f indicates flux –70-95 ksi...
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Submerged Arc WeldingSubmerged Arc Welding
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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
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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
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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