Lincoln Electric MC-706 User Manual

CORED WIRE

™

Metalshield

Mild Steel Metal-Cored Wire (AWS E70C-6M H8)

When you’re welding heavy-duty materials in demanding environments like structural steel, heavy equipment, agricultural, or automotive component manufacturing, you need a highly productive wire. Metalshield MC-706 is built for productivity throughout the welding process. MC-706 even welds well over mill scale to reduce prep time. A stiff sheath aids in improving the feedability of the wire, and few metal-cored products compare in terms of bead shape and appearance. Not only does MC-706 reduce the amount of silicate islands, it also moves the silicate islands away from the toes and into the center of the bead, making it easier to remove the silicon and minimize cleanup time.

MC-706

Advantage Lincoln

• Minimal silicate islands – reduces/eliminates cleaning.

• Silicate placement away from the toes of the weld – makes removal easier/makes it easier to visually inspect weld.

• Excellent wash-in and bead appearance – enhances weld bead appearance and improves overall weld quality.

• Stiffer sheath – excellent feedability.

• Excellent performance over mill scale – reduces joint preparation time.

• Minimal spatter when welding over mill scale – can reduce cleaning time.

• ISO14001 and 9001 certified – manufactured to standards for environmental and quality management systems.

Typical Applications

• High speed fillet welds on lap and T-joints.

• Robotic and hard automation.

• Weldments over mill scale where spatter must be minimized.

• Weldments that are coated after welding.

• Weldments where weld quality, weld productivity, and weld

appearance are of utmost importance.

• Out-of-position welding can be done with a pulsed spray or

short-arc welding procedure.

Welding Positions

Shielding Gas

75-92% Argon / Balance CO Flow Rate: 40-60 CFH Not recommended for use with 100% CO2.

Conformance

AWS A5.18-01: E70C-6M H8 ASME SFA-5.18: E70C-6M CWB/CSA: E492C-6M-H8

Diffusible Hydrogen - As required per AWS A5.18-01

(mL/100g weld deposit), 75% argon/25% CO2 shielding gas

Requirements (AWS E70C-6M H8): <8 Test Results: 3-5

DIAMETERS/PACKAGING

Diameter 33 Lb. (15 kg) 50 Lb. (23 kg) 50 Lb. (23 kg) Accu-Trak™ in. (mm) Steel Spool Fiber Spool Coil Drum (20 in.)

.045 (1.2) ED031583 ED031586 ED031589 ED031592 .052 (1.3) ED031584 ED031587 ED031590 ED031593

1/16 (1.6) ED031585 ED031588 ED031591 ED031594

MECHANICAL PROPERTIES – As Required per AWS A5.18-01

Yield Strength Tensile Strength Elongation ft•lbf (Joules)

psi (MPa) psi (MPa) (%) @ -20ºF (-29ºC)

Requirements

AWS E70C-6M H8 58,000 (400) 70,000 (483) 22 20 (27) As Welded min. min. min. min.

Test Results

75% Ar/25% CO

2 (407–433) (500–534) (37–65)

59,000–62,800 72,500–77,400

500 Lb. (227 kg)

25–29

Charpy V-Notch

27–48

Publication C3.11.2 1/06

www.lincolnelectric.com

DEPOSIT COMPOSITION - As Welded per AWS A5.18-01

%C %Mn %Si %S %P %Ni

Requirements 0.12 1.75 0.90 0.03 0.03 0.50

AWS E70C-6M H8 max. max. max. max. max. max.

Test Results 0.03– 1.28– 0.63– 0.029 0.01 0.33– 75% Ar/25% CO

0.04 1.49 0.76 max. max. 0.45

TYPICAL OPERATING PROCEDURES

Diameter

Polarity

(1)

CTWD

Wire Weight in/min Voltage Current Rate Rate Efficiency

Shielding Gas (m/min) (volts)

.045" (1.2 mm) 350 (8.9) 22-27 245 8.9 (4.0) 8.2 (3.7) 93

DC+ 400 (10.2) 23-27 260 10.1 (4.6) 9.4 (4.3) 93

3/4-1" (19-25 mm) 450 (11.4) 23-28 280 11.4 (5.2) 10.7 (4.9) 94

0.42 lbs./1000 (7.4 g/m) 500 (12.7) 23-29 305 12.6 (5.7) 12.2 (5.5) 97 90% Ar/10% CO

.052" (1.3 mm) 250 (6.4) 22-26 260 8.5 (3.9) 7.8 (3.5) 92

DC+ 300 (7.6) 22-27 290 10.2 (4.6) 9.5 (4.3) 94

3/4-1" (19-25 mm) 350 (8.9) 23-27 315 11.8 (5.4) 11.4 (5.2) 97

0.56 lbs./1000 (9.9 g/m) 400 (10.2) 24-28 350 13.8 (6.3) 13.4 (6.1) 97 90% Ar/10% CO

1/16" (1.6 mm) 200 (5.1) 22-25 280 9.4 (4.3) 8.7 (3.9) 93

DC+ 250 (6.4) 23-28 310 11.6 (5.3) 11.0 (5.0) 94

3/4-1" (19-25 mm) 300 (7.6) 24-29 370 13.9 (6.3) 13.8 (6.3) 99

0.78 lbs./1000 (13.9 g/m) 350 (8.9) 26-30 400 16.3 (7.4) 15.9 (7.2) 98 90% Ar/10% CO

(1)

To estimate ESO, subtract 3/16” (4.8mm) from CTWD.

(2)

For greater percentage of CO2shielding gas, increase voltage by 1-2 volts.

Wire Feed Speed Approx. Melt-Off Deposition

(2)

(amps) lbs/hr (kg/hr) lbs/hr (kg/hr) (%)

200 (5.1) 21-23 155 5.0 (2.3) 4.6 (2.1) 92 250 (6.4) 22-24 185 6.2 (2.8) 5.8 (2.6) 94 300 (7.6) 22-26 220 7.7 (3.5) 7.0 (3.2) 91

550 (14.0) 24-29 315 13.9 (6.3) 13.6 (6.2) 98 600 (15.2) 25-30 325 15.1 (6.8) 14.8 (6.7) 98 650 (16.5) 26-30 355 16.5 (7.5) 16.3 (7.4) 98 700 (17.8) 26-30 360 17.7 (8.0) 17.5 (7.9) 99

200 (5.1) 22-24 210 6.7 (3.0) 6.3 (2.9) 94

450 (11.4) 25-28 370 15.2 (6.9) 15.1 (6.8) 99 500 (12.7) 27-29 390 16.9 (7.7) 16.8 (7.6) 99 550 (14.0) 27-30 420 18.5 (8.4) 18.3 (8.3) 99

150 (3.8) 22-24 230 7.0 (3.2) 6.2 (2.8) 89

400 (10.2) 26-31 450 18.4 (8.3) 18.4 (8.3) 100 450 (11.4) 27-31 480 21.0 (9.5) 20.6 (9.3) 98

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.

TEST RESULTS

THE LINCOLN ELECTRIC COMPANY

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