What Is the Difference Between E70s-6 & E70s-7 Welding Wire?
Welding wire is a component of metal inert gas (MIG) arc welding. MIG systems feed solid steel wire through a tip in the welding gun. When the trigger on the gun is pulled, the tip becomes electrically charged and melts the wire to produce molten welding material.
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Classification Of Welding Wire
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Welding wire is American Welding Society (AWS) classified according to use, strength and composition. The AWS classification of an example such as E70s-X is expressed as E = Electrode use, 70 = tensile strength x (times) 1000, s = solid wire, and X = chemical composition percentage by weight.
E70s-6 Wire Specifications
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E70s-6 is a solid electrode wire with a tensile strength of 70,000 pounds per square inch (psi). Its chemical composition percent by weight is 0.07 carbon to 0.15 carbon, 1.40 manganese to 1.85 manganese and 0.80 silicon to 1.15 silicon.
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E70s-6 Wire Characteristics
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E70s-6 contains a high combination of silicon and manganese deoxidizers, making it suitable for all varieties of carbon steel welding and recommended for welding sheet metal. E70s-6 is a common choice for welding rusted or oily surfaces.
E70s-7 Wire Specifications
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E70s-7 is a solid electrode welding wire with a tensile strength of 70,000 psi. Its chemical composition per cent by weight is 0.07 carbon to 0.15 carbon, 1.50 manganese to 2.00 manganese and 0.50 silicon to 1.80 silicon.
E70s-7 Wire Characteristics
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E70s-7 wire resembles the general-purpose E70s-3 but with a higher percentage of manganese, giving it improved wetting performance and bead formation. It's usually used with argon-oxygen shielding gas but, unlike E70s-3, straight carbon dioxide (CO2) may also be used. The hardness of welds made with E70s-7 wire exceeds E70s-3, but not E70s-6.
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