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MIL-E-21562 Revision E, March 24, 1989
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ELECTRODES AND RODS - WELDING, BARE, NICKEL ALLOY
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The purpose of this specification is to ensure acquisition of nickel alloy filler metals meeting the minimum standards of quality control and chemical composition as specified herein. The minimum mechanical properties indicated herein represent controlled minimum properties used as the basis of acceptance from lot to lot of filler metal. These values also are considered representative of what can be expected when welding, under controlled conditions, base plates of compositions similar to those of the filler metal, where such compositions are available in wrought forms. Since this specification provides for the welding of these materials to themselves, for joining clad materials and for dissimilar welding of alloys to ordinary steel or corrosion resisting steels of the AISI 300 and 400 series, the mechanical property requirements indicated herein will generally not be suitable for design purposes. In such instances it is recommended that pilot weld tests be made representative of the welding procedures and alloys involved to establish mechanical properties for representative joints contemplated and made under controlled conditions.

Types MIL-EN60 and MIL-RN60 are recommended for welding nickel-copper alloy to itself and to steel, welding the clad side of nickel-copper alloy clad steel, and for overlaying nickel-copper alloy on steel. For certain overlaying applications, a barrier layer of nickel is required below the nickel-copper alloy overlay, and the manufacturer should be consulted.

Types MIL-EN61 and MIL-RN61 are recommended for the welding of nickel to itself, welding the clad side of nickel clad steel, and overlaying nickel on steel.

Types MIL-EN62 and MIL-RN62 are recommended for welding nickel-chromium-iron alloy to itself.

Types MIL-EN64 and MIL-RN64 are recommended for welding nickel-copper-aluminum alloy to itself. The deposited weld metal is age-hardenable, although the increment from age-hardening and mechanical properties to be expected after welding and aging will be lower than values obtainable from wrought material.

Type MIL-RN65 is recommended for the GTA welding of nickel-iron-chromium-molybdenum-copper alloy to itself. GMA welding of this material is not recommended.

Types MIL-EN67 and MIL-RN67 are recommended for the welding of 70-30, 80-20 and 90-10 copper-nickel alloys to themselves and to steel.

Type MIL-RN69 is recommended for the tungsten-arc welding of nickel-chromium-iron-titanium-aluminum-columbium to itself. The deposited weld metal is age-hardenable, although the increment from age-hardening and mechanical properties to be expected after welding and aging will be lower than values obtainable from wrought material.

Types MIL-EN6A and MIL-RN6A are recommended for the welding of nickel-chromium-iron-titanium-manganese alloys to steel, for overlaying nickel-chromium-iron alloy on steel, and for joining various heat and corrosion resistant alloys to each other and to steel and for welding the clad side of nickel-chromium-iron alloy clad steel.

Types MIL-EN6N and MIL-RN6N are recommended for joining of 80-20 nickel-chromium alloys to themselves, and for over-laying nickel-chromium alloy on steel.

Types MIL-EN82, MIL-EN82H, MIL-RN82 and MIL-RN82H are recommended for welding of nickel-chromium-iron alloy to itself and to steel, for overlaying nickel-chromium-iron alloy on steel, and for welding the clad side of Ni-Cr-Fe alloy clad steel.

Types MIL-EN625 and MIL-RN625 are recommended for welding of nickel-chromium-molybdenum-columbium alloy to itself and to steel and the overlaying of nickel-chromium-molybdenum-columbium alloy on steel.