Cored electrode with metal powder in core for shielded welding, made by Lincoln Electric

History of development of cored wires for gas-shielded welding goes back to year 1957, where first cored wires with rutile in core were introduced into market. These materials were intended for basic welding positions and weld metal had lower mechanical properties. Then came cored wires with basic filling. In 1972 were developed cored wires with rutile in core, suitable also for welding in welding positions. Cored wires with metal powder in core for the first time appeared in 1976. These cored materials are known for their excellent welding properties, low spatter and easy use in positions.

With ongoing development of cored wires, their welding and mechanical properties improved and later on cored wires of small diameters 0,9 mm appeared.

At present time, the range of cored wires for gas shielded welding differs according to type of filling:

Very interesting types of cored wires are wires with metal powder in core. Lincoln Electric firm makes cored wires Outershield MC710H, Outershield MC715-H, Outershield MC1100.

Compared to solid wires the cored wires with metal powder in core have the following advantages:

Disadvantages:

Basic type of wire Outershield MC710H is intended for welding in all positions, has excellent welding properties, noth impact strength n 47 J at –300C. Suitable for one-layer and multi-layer welds, weld metal has less then 5 ml/H in 100g of weld metal. Characteristic feature is high melt-off. Easy arc burning in short-circuiting and pulsed welding process. Made in dia 1,2; 1,4; 1,6; 2,0; 2,4 mm. Packing of wires Outershield is 4,5kg; 15kg; 25kg; 250kg. Mechanical properties of this material are given in table 3.

Customer can choose diameter of cored wire in packing, which suits him and use lower prices of these wires in larger packing.

In table 1, there are given technical data for use of this type of wire with welding parameters and outputs. In table 2, there are given recommended parameters for welding in positions for above stated type of wire.

Another cored wire with metal powder in core is Outershield MC715, which has simillar properties as material Outershield MC710, however it has still better mechanical properties, espacially notch impact strength at low temperatures – more then 47 J at – 40 C.

Another cored wire with metal powder in core Outershield MC1100 is intended for welding of highstrength steels, weld metal contains less than 4 ml H in 100 g. Yield point of weld metal is 720 MPa. Breaking strength of weld metal is 815 MPa at elongation 15 – 21%. Mechanical properties of this material are given in table 4.

We can conclude that the use of cored wires with metal powder in core brings substantial improvement of the quality and reliability of welds, higher welding output and excellent appearance of welds in all positions.

Table 1. Melt-off rates for wire MC 710 – H

Diameter (mm)

Type of arc

Wire feed speed
(cm/min)

Current
(A)

Voltage
(V)

Melt-off rate
(kg/h)

1,0

Short-circuiting arc

Spray arc

540

975

1270

1015

1270

1780

80

120

150

170

220

240

15

17

18

27-29

29-32

31-34

0,9

1,6

2,0

2,5

4,1

5,8

1,2

Short-circuiting arc

Spray arc

460

655

870

635

1145

1650

90

120

150

180

275

340

15

16

17

28-30

31-34

35-38

1,1

1,4

1,9

2,7

4,8

6,8

1,4

Short-circuiting arc

Spray arc

205

255

280

445

890

1400

105

125

135

170

270

355

14,5

15,0

15,5

27-29

29-32

32-34

1,2

1,5

1,6

2,5

5,0

8,1

1,6

Short-circuiting arc

Spray arc

180

205

230

380

635

890

1145

145

160

170

235

325

400

460

15

16

18

25-26

29-32

34-37

36-38

1,5

1,7

1,9

2,9

5,0

7,0

9,1

2,0

Spray arc

320

510

760

290

385

510

25-27

28-31

32-35

3,7

6,1

9,3

2,4

Spray arc

 

400

475

550

28-32

28-32

30-34

 

 

Table 2. Recommended parameters when welding in positions for wire MC 710 – H

Welding position
Diameter
(mm)

Current/Voltage

1G

2F

2G

3G

upward

3G

downward

4G

1,0

(A)

(V)

210-375

25-33

210-375

25-33

150-200

16-18

130-150

15-17

150

16

150-200

16-18

1,2

(A)

(V)

230-380

26-36

230-380

26-36

230-300

26-30

130-170

15-17

130-170

16-17

140-175

16-17

1,4

(A)

(V)

240-385

26-36

240-385

26-36

240-340

26-31

160-180

14-15

160-180

14-15

175-185

15-16

1,6

(A)

(V)

280-460

28-36

280-460

28-36

270-300

28-30

   

--

--

2,0

(A)

(V)

300-510

28-33

300-510

28-33

     

--

--

2,4

(A)

(V)

400-550

32-36

400-550

32-36

       

 

Table 3. Mechanical values of weld metal when using wire MC 710-H

Re (N/mm2)

Rm (N/mm2)

A (%)

KV (J/ C)

480

550

30

50/-30 C

 

Table 4.Mechanical properties of weld metal when using wire MC 1100 – H

Re (N/mm2)

Rm (N/ mm2)

A (%)

KV (J/ C)

720

815

21

45/-50 C

 

Detail information will be given by CZ WELD team.

 

CZ WELD s.r.o., Pod brizkami 800, 530 02 Pardubice, Czech Republic, tel./fax: +420 466 303 210
info@czweld.cz, http://www.czweld.cz