Stainless steel flux-cored welding wire for welding of zinc-coated steel sheet and arc welding method of zinc-coated steel sheet using same
View Patent ↗A stainless steel flux-cored welding wire for zinc-coated steel sheet welding use which gives a weld zone where no zinc embrittlement cracking occurs and the corrosion resistance and ductility are excellent and which is good in weld work efficiency and a welding method using the same, the welding wire characterized in that total amounts of elements which are included as metals or alloy compositions in the sheath and flux are, by mass % with respect to a total mass of the welding wire, C: 0.01 to 0.05%, Si: 0.1 to 1.5%, Mn: 0.5 to 3.0%, Ni: 7.0 to 10.0%, and Cr: 26.0 to 30.0%, an F value is 30 to 50 in range, further, the wire contains, as slag forming agents, in the flux, by mass % with respect to the total mass of the wire, TiO 2 : 3.8 to 6.8%, SiO 2 : 1.8 to 3.2%, ZrO 2 : 1.3% or less, and Al 2 O 3 : 0.5% or less, a total amount of the slag forming agent and other slag forming agents is 7.5 to 10.5%, furthermore, the TiO 2 satisfies, by mass % with respect to the total amount of slag forming agents, TiO 2 : 50 to 65%, and a balance of the sheath and flux is Fe and unavoidable impurities.
1. A stainless steel flux-cored welding wire for welding of a zinc-coated steel sheet, the welding wire comprised of a stainless steel sheath in which flux is filled,
characterized in that total amount of elements which are included as metals or alloy compositions in said sheath and flux are, by mass % with respect to a total mass of the welding wire,
C: 0.01 to 0.05%,
Si: 0.1 to 1.5%,
Mn: 0.5 to 3.0%,
Ni: 7.0 to 10.0%, and
Cr: 26.0 to 30.0%, and
a F value which is defined by the following formula (1) is 30 to 50;
further, said flux comprises, as slag forming agents, by mass % with respect to the total mass of the wire,
TiO 2 : 3.8 to 6.8%,
SiO 2 : 1.8 to 3.2%,
ZrO 2 : 1.3% or less (including 0%), and
Al 2 O 3 : 0.5% or less (including 0%), and
a total amount of said slag forming agents and other slag forming agents is 7.5 to 10.5%;
furthermore, said TiO 2 satisfies, by mass % with respect to the total amount of slag forming agents,
TiO 2 : 50 to 65%;
a balance of said sheath and flux is Fe and unavoidable impurities;
F
value
=
3
×
[
Cr
%
]
+
4.5
×
[
Si
%
]
-
2.8
×
[
Ni
%
]
-
84
×
[
C
%
]
-
1.4
×
[
Mn
%
]
-
19.8
(
1
)
wherein [Cr %], [Si %], [Ni %], [C %], and [Mn %] respectively indicate totals of Cr, Si, Ni, C, and Mn contained in the sheath and wire in the welding wire with respect to the total mass of the wire.
2. The stainless steel flux-cored welding wire for welding of the zinc-coated steel sheet as set forth in claim 1 , further comprising Bi as a metal or alloy composition, and a total amount contained in said sheath and flux is, by mass % with respect to a total mass of the welding wire,
Bi: 0.01 to 0.1%.
3. An arc welding method of zinc-coated steel sheets, characterized in that coating of the zinc-coated steel sheet is zinc-based alloy coating comprising, by mass %,
Al: 2 to 19%,
Mg: 1 to 10%,
Si: 0.01 to 2% and
a balance of Zn and unavoidable impurities;
the zinc-coated steel sheet coated is arc welded, using the stainless steel flux-cored welding wire for welding of the zinc-coated steel sheet as set forth in claim 1 or 2 .
4. An arc welding method of zinc-coated steel sheet, characterized in that the steel sheet other than coating of the zinc-coated steel sheet comprises, by mass %,
C: 0.01 to 0.2%,
Si: 0.01 to 2.0%,
Mn: 0.5 to 3.0%,
P: 0.020% or less,
S: 0.020% or less,
Al: 0.001 to 0.5%,
Ti: 0.001 to 0.5%,
B: 0.0003 to 0.004%,
N: 0.0005 to 0.006%, and
a balance of Fe and unavoidable impurities;
the zinc-coated steel sheet coated is arc welded, using the stainless steel flux-cored welding wire for welding of zinc-coated steel sheet as set forth in claim 1 or 2 .
5. The arc welding method of zinc-coated steel sheet as set forth in claim 4 , characterized in that the zinc-coated steel sheet other than the coating further comprises one or both of Nb and V, and the total amount of Nb and V is 0.01 to 0.20%.