{"product_id":"lincoln-innershield-nr-311-fcaw-s-welding-wire","title":"Innershield NR-311 E70T-7 Flux-Core Wire | Lincoln","description":"\u003c!-- Wire Lane E | lincoln-innershield-nr-311-fcaw-s-welding-wire | 2026-06-16 --\u003e\n\u003ch2\u003eLincoln Innershield NR-311 — High-Deposition Self-Shielded FCAW Wire\u003c\/h2\u003e\n\u003cp\u003eLincoln Electric Innershield® NR-311 is a self-shielded, flux-cored arc welding (FCAW-S) wire designed for the highest possible deposition rates in flat and horizontal positions without requiring external shielding gas. Classified per \u003cstrong\u003eAWS A5.20 \/ A5.36: E70T-7 \/ E70T7-AZ-CS3\u003c\/strong\u003e, NR-311 runs on \u003cstrong\u003eDC electrode negative (DCEN)\u003c\/strong\u003e — the opposite polarity from solid MIG wire — and delivers an open-arc, high-current process capable of melt-off rates exceeding 13 lb\/hr. Its self-contained flux chemistry shields the arc from atmosphere and produces an easily removed slag with excellent bead shape in fillet, lap, and butt joints. NR-311 is the productivity choice for shops and field crews that cannot use gas cylinders outdoors or in windy conditions.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAWS Classification\u003c\/td\u003e\n\u003ctd\u003eE70T-7 \/ E70T7-AZ-CS3 (AWS A5.20 \/ A5.36)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eAvailable Diameters\u003c\/td\u003e\n\u003ctd\u003e5\/64 in (2.0 mm), 3\/32 in (2.4 mm), 7\/64 in (2.8 mm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eShielding Gas\u003c\/td\u003e\n\u003ctd\u003eNone — self-shielded (FCAW-S)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePolarity\u003c\/td\u003e\n\u003ctd\u003eDCEN (DC electrode negative)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eWelding Position\u003c\/td\u003e\n\u003ctd\u003eFlat (1G \/ 1F) and Horizontal (2G \/ 2F)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (required)\u003c\/td\u003e\n\u003ctd\u003e480 MPa (70 ksi) minimum per AWS A5.20\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eTensile Strength (typical)\u003c\/td\u003e\n\u003ctd\u003e590 MPa (86 ksi) as-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eYield Strength (typical)\u003c\/td\u003e\n\u003ctd\u003e430 MPa (62 ksi) as-welded\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElongation (typical)\u003c\/td\u003e\n\u003ctd\u003e25 % in 2 in\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eElectrode Stick-Out (ESO)\u003c\/td\u003e\n\u003ctd\u003e1–1\/2 in (38 mm) typical\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDeposition Rate (5\/64 at 200 in\/min)\u003c\/td\u003e\n\u003ctd\u003e~4.5 kg\/hr (9.9 lb\/hr)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eDeposition Rate (5\/64 at 240 in\/min)\u003c\/td\u003e\n\u003ctd\u003e~5.5 kg\/hr (12.1 lb\/hr)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMinimum Plate Thickness\u003c\/td\u003e\n\u003ctd\u003e3.2 mm (1\/8 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eApplications and Industries\u003c\/h2\u003e\n\u003cp\u003eNR-311's E70T-7 classification per \u003ca href=\"https:\/\/www.aws.org\/standards\/detail\/AWS-A5-20-2005\" rel=\"nofollow\"\u003eAWS A5.20\u003c\/a\u003e places it in the high-deposition, flat\/horizontal category without required impact toughness — making it the right choice when deposition rate and productivity matter more than low-temperature CVN performance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStructural steel fabrication\u003c\/strong\u003e — fillet welds on columns, beams, base plates, and bracket connections on 1\/8 in and heavier steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eField construction and bridge work\u003c\/strong\u003e — outdoor welding where wind would blow away shielding gas; no cylinder handling required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGeneral fabrication and assembly\u003c\/strong\u003e — high-speed lap welds, T-joints, and butt welds on mild and some low-alloy steels in production environments\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeavy equipment repair\u003c\/strong\u003e — bucket teeth attachments, lifting lugs, and structural repairs where fast deposition on thick sections is required\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShipbuilding and barge construction\u003c\/strong\u003e — flat and horizontal stiffener welds where gas shielding is impractical\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProcess Technology and Selection Guide\u003c\/h2\u003e\n\u003cp\u003eInnershield NR-311 uses a self-shielding flux system: as the electrode melts, the flux core decomposes to generate protective shielding gases and forms a slag blanket that protects the solidifying weld metal. This makes NR-311 uniquely suited for outdoor and field applications where wind, drafts, or limited accessibility make gas-shielded processes impractical. The open-arc characteristic and DCEN polarity allow very high wire feed speeds — the 5\/64 in diameter supports wire feed speeds from 100 to 240 in\/min, corresponding to currents from 170 to 295 amps.\u003c\/p\u003e\n\u003cp\u003eBecause NR-311 is rated for flat and horizontal positions only, it should not be used for vertical or overhead welding. For out-of-position self-shielded work, see \u003ca href=\"\/products\/lincoln-ed016354-innershield-nr-211-mp-flux-cored-fcaw-s-welding-wire-0-035-in-10-lb-spool\"\u003eInnershield NR-211-MP (E71T-11, all-position)\u003c\/a\u003e. NR-311 does not have specified CVN impact toughness requirements — for structural seismic applications requiring notch toughness, see the NR-311 Ni variant.\u003c\/p\u003e\n\n\u003ch2\u003ePolarity and Parameter Table\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n\u003cth\u003eDiameter\u003c\/th\u003e\n\u003cth\u003ePolarity\u003c\/th\u003e\n\u003cth\u003eESO\u003c\/th\u003e\n\u003cth\u003eWFS (in\/min)\u003c\/th\u003e\n\u003cth\u003eVoltage (V)\u003c\/th\u003e\n\u003cth\u003eCurrent (A)\u003c\/th\u003e\n\u003cth\u003eDeposition (lb\/hr)\u003c\/th\u003e\n\u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5\/64 in (2.0 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in (38 mm)\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e21–23\u003c\/td\u003e\n\u003ctd\u003e170\u003c\/td\u003e\n\u003ctd\u003e5.5\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5\/64 in (2.0 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in (38 mm)\u003c\/td\u003e\n\u003ctd\u003e160\u003c\/td\u003e\n\u003ctd\u003e25–27\u003c\/td\u003e\n\u003ctd\u003e235\u003c\/td\u003e\n\u003ctd\u003e8.8\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5\/64 in (2.0 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in (38 mm)\u003c\/td\u003e\n\u003ctd\u003e200\u003c\/td\u003e\n\u003ctd\u003e26–28\u003c\/td\u003e\n\u003ctd\u003e270\u003c\/td\u003e\n\u003ctd\u003e11.0\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e5\/64 in (2.0 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-1\/2 in (38 mm)\u003c\/td\u003e\n\u003ctd\u003e240\u003c\/td\u003e\n\u003ctd\u003e27–29\u003c\/td\u003e\n\u003ctd\u003e295\u003c\/td\u003e\n\u003ctd\u003e13.3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e3\/32 in (2.4 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-3\/4 in (44 mm)\u003c\/td\u003e\n\u003ctd\u003e80\u003c\/td\u003e\n\u003ctd\u003e26–28\u003c\/td\u003e\n\u003ctd\u003e275\u003c\/td\u003e\n\u003ctd\u003e~12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e3\/32 in (2.4 mm)\u003c\/td\u003e\n\u003ctd\u003eDCEN\u003c\/td\u003e\n\u003ctd\u003e1-3\/4 in (44 mm)\u003c\/td\u003e\n\u003ctd\u003e100\u003c\/td\u003e\n\u003ctd\u003e28–30\u003c\/td\u003e\n\u003ctd\u003e330\u003c\/td\u003e\n\u003ctd\u003e~15\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv itemscope itemtype=\"https:\/\/schema.org\/FAQPage\"\u003e\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat is the AWS classification for Lincoln Innershield NR-311?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eInnershield NR-311 is classified as \u003cstrong\u003eE70T-7 per AWS A5.20\u003c\/strong\u003e and \u003cstrong\u003eE70T7-AZ-CS3 per AWS A5.36\u003c\/strong\u003e. The \"T-7\" classification indicates a self-shielded, flat\/horizontal electrode intended for high deposition rates without specified CVN impact toughness requirements. Lincoln Electric also lists it as compliant with AWS D1.8 seismic supplement requirements.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eDoes NR-311 require shielding gas?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Innershield NR-311 is a self-shielded (FCAW-S) wire. The flux inside the tubular electrode generates its own shielding atmosphere when the arc melts the wire. No external gas cylinder, regulator, or hose is required — making it ideal for outdoor, field, and remote welding situations where wind or lack of infrastructure makes gas shielding impractical.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat polarity does NR-311 use?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eNR-311 runs on \u003cstrong\u003eDCEN (DC Electrode Negative)\u003c\/strong\u003e — also called straight polarity. This is the opposite of solid MIG wire (which uses DCEP). Ensure your wire feeder and power source are set to DC−. Running an Innershield wire on DCEP will result in an erratic arc, excessive spatter, and poor penetration.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat positions can NR-311 be used in?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eNR-311 is rated for \u003cstrong\u003eflat (1G\/1F) and horizontal (2G\/2F) positions only\u003c\/strong\u003e. Its high-deposition, fast-freeze slag system is optimized for these positions and should not be used in vertical or overhead orientations. For all-position self-shielded FCAW, choose Innershield NR-211-MP (E71T-11) or NR-232 (E71T-8).\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n  \u003cdiv itemscope itemprop=\"mainEntity\" itemtype=\"https:\/\/schema.org\/Question\"\u003e\n    \u003ch3 itemprop=\"name\"\u003eWhat is the electrode stick-out (ESO) for NR-311?\u003c\/h3\u003e\n    \u003cdiv itemscope itemprop=\"acceptedAnswer\" itemtype=\"https:\/\/schema.org\/Answer\"\u003e\n      \u003cp itemprop=\"text\"\u003eThe recommended electrode stick-out for the 5\/64 in diameter NR-311 is \u003cstrong\u003e1-1\/2 in (38 mm)\u003c\/strong\u003e, and for 3\/32 in it is \u003cstrong\u003e1-3\/4 in (44 mm)\u003c\/strong\u003e. This is significantly longer than solid MIG wire stick-out (which is typically 1\/2–3\/4 in). The extended stick-out is critical to achieving stable arc performance with Innershield electrodes — too short a stick-out will result in a cold, erratic arc.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eBrowse the complete \u003ca href=\"\/collections\/welding-wire\"\u003ewelding wire collection\u003c\/a\u003e or compare with \u003ca href=\"\/products\/lincoln-innershield-ns-3m-fcaw-s-welding-wire\"\u003eInnershield NS-3M (E70T-4)\u003c\/a\u003e for even higher deposition rates, or \u003ca href=\"\/products\/lincoln-ed016354-innershield-nr-211-mp-flux-cored-fcaw-s-welding-wire-0-035-in-10-lb-spool\"\u003eInnershield NR-211-MP\u003c\/a\u003e for all-position self-shielded work.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the AWS classification for Lincoln Innershield NR-311?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Innershield NR-311 is classified as E70T-7 per AWS A5.20 and E70T7-AZ-CS3 per AWS A5.36. The T-7 classification indicates a self-shielded, flat\/horizontal electrode for high deposition rates without specified CVN impact toughness.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does NR-311 require shielding gas?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. Innershield NR-311 is a self-shielded (FCAW-S) wire. The flux inside generates its own shielding atmosphere — no external gas cylinder, regulator, or hose is required.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What polarity does NR-311 use?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"NR-311 runs on DCEN (DC Electrode Negative), also called straight polarity — the opposite of solid MIG wire. Running it on DCEP will result in erratic arc, excessive spatter, and poor penetration.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What positions can NR-311 be used in?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"NR-311 is rated for flat (1G\/1F) and horizontal (2G\/2F) positions only. For all-position self-shielded FCAW, choose Innershield NR-211-MP or NR-232.\"}\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the electrode stick-out for NR-311?\",\n      \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The recommended ESO for 5\/64 in NR-311 is 1-1\/2 in (38 mm); for 3\/32 in it is 1-3\/4 in (44 mm). This is significantly longer than solid MIG wire and is critical for stable arc performance.\"}\n    }\n  ]\n}\n\u003c\/script\u003e\n","brand":"Lincoln Electric","offers":[{"title":"5\/64 in · 25 lb Spool","offer_id":43638068314263,"sku":"ED030649","price":207.12,"currency_code":"USD","in_stock":true},{"title":"5\/64 in · 50 lb Coil","offer_id":43638031548567,"sku":"ED014459","price":378.51,"currency_code":"USD","in_stock":true},{"title":"5\/64 in · (4) 14 lb Coil","offer_id":43638031777943,"sku":"ED014464","price":498.98,"currency_code":"USD","in_stock":true},{"title":"3\/32 in · 50 lb Coil","offer_id":43638047899799,"sku":"ED012629","price":358.01,"currency_code":"USD","in_stock":true},{"title":"3\/32 in · 600 lb Speed-Feed Drum","offer_id":43638047146135,"sku":"ED012628","price":4407.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/7140\/4695\/files\/lincoln-ed014459-innershield-nr-311-flux-cored-fcaw-s-welding-wire-564-in-50-lb-coil-lincoln-electric.jpg?v=1766430793","url":"https:\/\/weldingmart.com\/products\/lincoln-innershield-nr-311-fcaw-s-welding-wire","provider":"WeldingMart.com","version":"1.0","type":"link"}