Lincoln Electric NR-233 User Manual

CORED WIRE

Innershield

NR-233

Self-Shielded Flux-Cored Wire

(AWS A5.20-95: E71T-8)

NR-233 is an advanced technology, self-shielded flux-cored electrode designed for high deposition rate welding - even when welding out-of-position in seismic and non-seismic structural steel applications. It is also great for fillet welding for ship and barge fabrication. The electrode is welder-friendly, making it easier to pass tough qualification tests and deposit great looking beads. It does all this while delivering Charpy V-Notch properties that meet many of the more stringent codes and specifications for seismic applications.

Advantage Lincoln

User Friendly

• For the engineer: meets the stringent codes and standards for Charpy V-Notch properties, such as those listed in FEMA 353.

• For the plant superintendent: higher deposition rates mean faster building erection, quicker launch of the barge, or more throughput in fabrication. In short: less cost and more profit.

• For the welder: a more forgiving arc with greater penetration makes it easier to pass qualification tests, and makes for bet ter quality welds in production — and the welds look great.

• NR-233 has been formulated to minimize gas marking, even

after the electrode has been exposed to the atmosphere.

Welding Positions

➔

Conformance

AWS A5.20-95: E71T-8 ASME SFA-5.20; E71T-8

➔

Typical Applications

• Vertical up fillet and groove welds

• Overhead fillet and groove welds

• Seismic structural steel erection

• General structural steel erection

• Barge fabrication

DIAMETERS/PACKAGING

25 Lb. (11.3kg) Diameter 12.5 Lb. (5.7kg) 25 Lb. (11.3kg) Plastic Spool in in. (mm) Plastic Spool Plastic Spool Vacuum Sealed Bag

1/16 (1.6) ED030933 ED030934 ED031576 .072 (1.8) ED031030 ED031577

1/16”

Allowable exposure per

Appendix D of FEMA 353

4 Weeks

Note: Appendix D of FEMA 353 allows

additional exposure beyond the 24 hour limit.

.072”

4 Weeks

Publication C3.2000.3 9/05

www.lincolnelectric.com

MECHANICAL PROPERTIES – As required per AWS A5.20-95

Yield Strength Tensile Strength Elongation ft•lbf (Joules)

Charpy V-Notch

psi (MPa) psi (MPa) (%) @ -20°F (-29°C)

Requirements 58,000 (400) 70,000 (480) 22 20 (27)

AWS E71T- 8 min. min. min. min.

Typical 62,000- 71,000 73,000 - 92,000 22 - 32 23 - 48 Test Results (430 - 490) (505 - 635) (31 - 65)

Note: The strength and elongation properties reported were obtained from a .505” tensile specimen artificially aged at 220º F (104º C) for 48 hours, as permitted by AWS A5.20-95. A naturally aged tensile specimen may take months to achieve the specified properties. See AWS A5.20-95, paragraph A8.3. The time required for the natural aging of weld deposits is dependent upon ambient conditions, weldment geometry, the metallurgical structure of the weld deposit and other factors.

TYPICAL OPERATING PROCEDURES

Diameter

Polarity Wire Feed Approx. Melt-Off Deposition

(1)

CTWD

Wire Weight in./min (m/min) (volts) (amps) lbs/hr (kg/hr) lbs/hr (kg/hr) (%)

1/16” 150 (3.8) 17-19 220 5.3 (2.4) 4.2 (1.9) 80

DC- 200 (5.1) 19-21 245 7.1 (3.2) 5.4 (2.5) 76

1/2-1-1/4”(13-32mm) 250 (6.4) 21-23 270 8.9 (4.0) 6.6 (3.0) 74

0.582 lbs./1000” 300 (7.6) 23-25 295 10.4 (4.7) 7.7 (3.5) 75

.072 100 (2.5) 17-18 185 4.5 (2.0) 3.6 (1.6) 80

DC- 150 (3.8) 18-19 250 6.7( 3.1) 5.4 (2.5) 80

3/4-1”(19-25mm) 200 (5.1) 20-21 295 8.9 (4.0) 7.1 (3.2) 81

0.746 lbs./1000” 250 (6.4) 22-23 330 11.2 (5.1) 8.9 (4.0) 79

(1)

To estimate ESO, subtract 1/4” (6.4mm) from CTWD.

Note: For horizontal welding, subtract 1 volt.

Speed Voltage Current Rate Rate Efficiency

350 (8.9) 25-27 315 12.3 (5.6) 9.4 (4.3) 77

300 (7.6) 23-24 355 13.4 (6.1) 10.6 (4.8) 79

DEPOSIT COMPOSITION - As required per AWS A5.20-95

%C %Mn %P %S %Si %Al

Requirements Report 1.75 0.03 0.03 0.60 1.8

AWS E71T-8 Only max. max. max. max. max.

Typical Test Results 0.17-0.23 0.45-0.66 0.006-0.009 0.003 0.14-0.25 0.47-0.71

This electrode has been tested in accordance with FEMA 353 - Recommended Specifications and Quality Assurance Guidelines for Steel Moment-Frame Construction for Seismic Applications and is capable of depositing weld metal that delivers minimum CVN properties of 40 ft.lbf at 70˚ F (54 Joules at 21˚ C)

at low and high heat input levels. As required by the AWS classification, it meets a minimum CVN of 20 ft.lbf at -20˚ F (27 Joules at -29˚ C), when tested in accordance with AWS A5.20. This electrode will also deposit metal that will meet the requirements for H16 as tested according to AWS A4.3. FEMA certificates are available upon request.

Test results for mechanical properties, deposit or electrode composition and diffusible hydrogen levels were obtained from a weld produced and tested according to prescribed standards, and should not be assumed to be the expected results in a particular application or weldment. Actual results will vary depending on many factors, including, but not limited to, weld procedure, plate chemistry and temperature, weldment design and fabrication methods. Users are cautioned to confirm by qualification testing, or other appropriate means, the suitability of any welding consumable and procedure before use in the intended application.

CUSTOMER ASSISTANCE POLICY

The business of The Lincoln Electric Company is manufacturing and selling high quality welding equipment, consumables, and cutting equipment. Our challenge is to meet the needs of our customers and to exceed their expectations. On occasion, purchasers may ask Lincoln Electric for advice or information about their use of our products. We respond to our customers based on the best information in our possession at that time. Lincoln Electric is not in a position to warrant or guarantee such advice, and assumes no liability, with respect to such information or advice. We expressly disclaim any warranty of any kind, including any warranty of fitness for any customer’s particular purpose, with respect to such information or advice. As a matter of practical consideration, we also cannot assume any responsibility for updating or correcting any such information or advice once it has been given, nor does the provision of information or advice create, expand or alter any warranty with respect to the sale of our products.

Lincoln Electric is a responsive manufacturer, but the selection and use of specific products sold by Lincoln Electric is solely within the control of, and remains the sole responsibility of the customer. Many variables beyond the control of Lincoln Electric affect the results obtained in applying these types of fabrication methods and service requirements.

Subject to Change – This information is accurate to the best of our knowledge at the time of printing. Please refer to www.lincolnelectric.com for any updated information.

FEMA 353

TEST RESULTS

THE LINCOLN ELECTRIC COMPANY

22801 St. Clair Ave., Cleveland, OH 44117-1199 • 216.481.8100 • www.lincolnelectric.com