Weld Metal and Metal Cored Welding Wire For Producing Such a Weld Metal

Abstract

A weld metal having the following composition: C: 0.040-0.100 wt.-% Mn: 0.450-0.900 wt.-% Si: 0.600-1.000 wt.-% S: 0.005-0.025 wt.-% B: 0.003-0.010 wt.-% Ti: 0.030-0.100 wt.-% and optionally: Ni: 0.000-0.500 wt.-% P: 0.000-0.020 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

Claims

1. A weld metal having the following composition: C: 0.040-0.100 wt.-% Mn: 0.450-0.900 wt.-% Si: 0.600-1.000 wt.-% S: 0.005-0.025 wt.-% B: 0.003-0.010 wt.-% Ti: 0.030-0.100 wt.-% and optionally: Ni: 0.000-0.500 wt.-% P: 0.000-0.020 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

2. A weld metal according to claim 1, having the following composition: C: 0.050-0.090 wt.-% Mn: 0.500-0.900 wt.-% Si: 0.600-0.950 wt.-% S: 0.010-0.020 wt.-% B: 0.004-0.010 wt.-% Ti: 0.030-0.080 wt.-% and optionally: Ni: 0.000-0.020 wt.-% P: 0.000-0.015 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

3. A weld metal according to claim 1, having the following composition: C: 0.050-0.080 wt.-% Mn: 0.550-0.850 wt.-% Si: 0.650-0.900 wt.-% S: 0.012-0.020 wt.-% B: 0.005-0.009 wt.-% Ti: 0.030-0.070 wt.-% and optionally: Ni: 0.000-0.020 wt.-% P: 0.000-0.015 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

4. A weld metal according to claim 1, wherein Ni is present in an amount of 0.300-0.500 wt.-%.

5. A weld metal according to claim 1, wherein Ni is optionally present in an amount of 0.025 wt.-%.

6. A weld metal according to claim 1, wherein the sum of C and Mn is less than 0.70 wt.-%.

7. A weld metal according to claim 1, wherein the sum of Mn and Si is greater than 1.40 wt.-%.

8. A weld metal according to claim 1, wherein B/Ti>0.10.

9. A metal cored welding wire for producing a weld metal according to claim 1 by means of electric arc welding, comprising a filling powder and a sheath enclosing the filling powder, characterized in that the sheath has the following composition: C: 0.010-0.075 wt.-% Mn: 0.100-0.400 wt.-% and optionally: P: 0.000-0.025 wt.-% S: 0.000-0.020 wt.-%, the balance being iron and unavoidable impurities, and wherein the filling powder has the following composition: C: 0.080-0.140 wt.-% Mn: 0.400-0.900 wt.-% Si: 0.650-1.100 wt.-% S: 0.005-0.015 wt.-% B: 0.005-0.015 wt.-% Ti: 0.070-0.200 wt.-% and optionally: P: 0.000-0.002 wt.-% Ni: 0.000-0.001 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

10. A metal cored welding wire according to claim 9, wherein the sheath has the following composition: C: 0.020-0.050 wt.-% Mn: 0.150-0.400 wt.-% and optionally: P: 0.000-0.012 wt.-% S: 0.000-0.010 wt.-%.

11. A metal cored welding wire according to claim 9, wherein the filling power has the following composition: C: 0.085-0.130 wt.-% Mn: 0.450-0.800 wt.-% Si: 0.700-1.100 wt.-% S: 0.005-0.012 wt.-% B: 0.005-0.010 wt.-% Ti: 0.080-0.150 wt.-% and optionally: P: 0.000-0.0015 wt.-% Ni: 0.000-0.001 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

12. A metal cored welding wire according to claim 9, wherein the filling power has the following composition: C: 0.090-0.125 wt.-% Mn: 0.500-0.800 wt.-% Si: 0.750-1.000 wt.-% S: 0.006-0.010 wt.-% B: 0.006-0.010 wt.-% Ti: 0.080-0.140 wt.-% and optionally: P: 0.000-0.0015 wt.-% Ni: 0.000-0.001 wt.-% Cu, Cr, Nb, N, Mo, Al, W and V: 0.000-0.020 wt.-% each, the balance being iron and unavoidable impurities.

13. A metal cored welding wire according to claim 9, wherein the filling ratio is between 10 and 20%, preferably between 10 and 15% and more preferably between 10.8 and 11.5%, wherein in the filling ratio is defined as the percentage of the weight of the filling powder in relation to the weight of the metal cored welding wire.

14. A metal cored welding wire according to claim 9, wherein the welding wire is coated with a coating being made of or comprising Cu.

Description

EXAMPLES 1-4

[0100] Metal cored welding wires having the compositions indicated in Table 1 were used.

TABLE-US-00001 TABLE 1 Ex. No. 1 2 3 4 Sheath C (wt.-%) 0.031 0.031 0.031 0.031 Mn (wt.-%) 0.204 0.204 0.204 0.204 P (wt.-%) 0.007 0.007 0.007 0.007 S (wt.-%) 0.008 0.008 0.008 0.008 Balance: iron and unavoidable impurities Filling powder C (wt.-%) 0.113 0.116 0.112 0.112 Mn (wt.-%) 0.632 0.648 0.625 0.625 Si (wt.-%) 0.912 0.935 0.902 0.902 P (wt.-%) 0.001 0.001 0.001 0.001 S (wt.-%) 0.009 0.009 0.009 0.009 B (wt.-%) 0.008 0.009 0.008 0.008 Ti (wt.-%) 0.112 0.115 0.111 0.111 Balance iron and unavoidable impurities Coating Cu Diameter (mm) 1.2 1.2 1.2 1.2 Filling ratio (%) 11.2 11.5 11.1 11.1

[0101] Welding tests have been conducted with the welding wires indicated above, wherein the welding parameters indicated in Table 2 were used.

TABLE-US-00002 TABLE 2 Ex. No. 1 2 3 4 Shielding gas M21 M21 M21 M20 Current (A) 265 260 265 270 Voltage (V) 28 28.2 28 28.5 Welding speed (mm/min) 370 370 370 370 Wire speed (m/min) 8.2 8.5 8.2 9.0 Heat Input (kJ/mm) 1.2 1.2 1.2 1.2 M20: 92% Ar/8% CO.sub.2, M21: 82% Ar/18% CO.sub.2

[0102] The resulting weld metal is indicated in Table 3.

TABLE-US-00003 TABLE 3 Ex. No. 1 2 3 4 C (wt.-%) 0.060 0.078 0.066 0.074 Mn (wt.-%) 0.661 0.793 0.667 0.720 Si (wt.-%) 0.765 0.835 0.773 0.830 P (wt.-%) 0.005 0.011 0.010 0.011 S (wt.-%) 0.015 0.019 0.017 0.016 B (wt.-%) 0.006 0.007 0.007 0.007 Ti (wt.-%) 0.048 0.050 0.044 0.053 Balance iron and unavoidable impurities

[0103] The weld metal of each example was tested for its mechanical properties in accordance with EN ISO 15792-1 edition: 2020, the results being indicated in Table 4.

TABLE-US-00004 TABLE 4 Ex. No. 1 2 3 4 Rm (MPa) 525 569 537 569 Rp0.2 (MPa) 463 494 462 492 Elongation at break A (%) 29.8 21.8 28.7 22.5 Necking/striction Z (%) 69.8 69.1 72.2 72.3 KV @ 30 C. (J) 76 69 77 68 KV @ 40 C. (J) 75 69 44 55

[0104] The tensile properties (Rm, Rp02, A and Z) were measured according to EN ISO 6892-1:2020. The impact tests (KV) were carried out according to EN ISO 148-1:2016.

Welding Fume Analysis:

[0105] The welding wire of Example 2 was used to conduct a welding fume analysis. Testing was performed with the welding parameters indicated in Table 5.

TABLE-US-00005 TABLE 5 Parameter Wire speed 8.8 m/min Current 277 A Voltage 29.4 V Shielding gas M21 Shielding gas flow rate 18 l/min Polarity DC+ Welding speed 100 cm/min Contact tip welding distance 20 mm

[0106] The fume analysis was carried out according to EN ISO 15011-4:2018 and provided the results indicated in Table 6.

TABLE-US-00006 TABLE 6 Fume components Fe 60.10 wt.-% Mn 2.52 wt.-% Ni 0.017 wt.-% Cr 0.021 wt.-% Cu 0.190 wt.-% Fume emission rate (FER) 9.6 0.21 mg/s (34.6 g/h) Mn emission rate 0.242 mg/s