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Submerged Arc Welding Submerged 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
Submerged Arc Welding 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 contamination Þ porosity • Normally not suitable for thin material • Restricted to the flat position for grooves - flat and horizontal for fillets • Slag removal required • Flux handling equipment