US2021114132A1PendingUtilityA1
Welding waveform for stainless steel applications
Est. expiryJun 28, 2036(~9.9 yrs left)· nominal 20-yr term from priority
B23K 2103/05B23K 9/18B23K 9/095B23K 9/0953B23K 9/1006B23K 9/092B23K 9/23B23K 9/186
69
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Claims
Abstract
Specific AC welding waveforms are utilized to increase the toughness level of austenitic stainless steel above what is achieved using the same welding consumables using standard DC welding waveforms.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A submerged arc welding method, comprising the steps of:
providing a submerged arc welding system, wherein the submerged arc welding system includes:
a welding power source which generates a welding output having an AC welding output current;
a welding torch coupled to the welding power source to receive the welding output from the welding power source;
a wire feeder;
an L-grade stainless steel welding electrode delivered to the welding torch by the wire feeder;
a submerged arc welding flux delivery system; and
a controller coupled to the welding power source and that controls the welding power source in accordance with a welding waveform to generate the welding output to the welding torch;
creating a weld on a stainless steel workpiece by the submerged arc welding system, wherein the weld is created using the L-grade stainless steel welding electrode and is suitable for cryogenic applications by having a toughness of greater than 40 foot-pounds at −320° F., wherein the AC welding output current is biased toward DC negative such that the welding output has a negative effect of less than 100 per equation #1;
Negative
Effect
=
[
07
*
(
I
p
,
p
*
B
-
I
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
I
p
,
p
+
I
p
,
n
)
+
0.3
*
(
V
p
.
p
*
B
-
V
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
V
p
,
p
+
V
p
,
n
)
]
*
(
1
1
0
0
0
)
Equation
#1
wherein:
B is a percentage of time the L-grade stainless steel welding electrode is positively charged;
I p,p is a peak current in an electrode positive polarity of the welding output;
I p,n is a peak (absolute) current in an electrode negative polarity of the welding output;
V p,p is a peak voltage in the electrode positive polarity of the welding output; and
V p,n is a peak (absolute) voltage in the electrode negative polarity of the welding output.
2 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −700 to 100.
3 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −700 to 0.
4 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −100 to 100.
5 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −100 to 0.
6 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −80 to 80.
7 . The submerged arc welding method of claim 1 , wherein the negative effect is in a range of −80 to 0.
8 . The submerged arc welding method of claim 1 , wherein the L-grade stainless steel welding electrode has a ferrite number between 6 and 10.
9 . A submerged arc welding method, comprising the steps of:
providing a submerged arc welding system, wherein the submerged arc welding system includes:
a welding power source which generates a welding output having a first welding output portion and a second welding output portion, wherein the first welding output portion has an AC welding output current;
a welding torch coupled to the welding power source to receive the welding output from the welding power source;
a wire feeder;
an L-grade stainless steel welding electrode delivered to the welding torch by the wire feeder;
a submerged arc welding flux delivery system; and
a controller coupled to the welding power source and that controls the welding power source in accordance with a welding waveform to generate the welding output to the welding torch;
creating a weld on a stainless steel workpiece by the submerged arc welding system, wherein the weld is created using the L-grade stainless steel welding electrode and is suitable for cryogenic applications by having a toughness of greater than 40 foot-pounds at −320° F., wherein the AC welding output current is biased toward DC negative such that the welding output has a negative effect in the range of −700 to 100 per equation #1;
Negative
Effect
=
[
07
*
(
I
p
,
p
*
B
-
I
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
I
p
,
p
+
I
p
,
n
)
+
0.3
*
(
V
p
.
p
*
B
-
V
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
V
p
,
p
+
V
p
,
n
)
]
*
(
1
1
0
0
0
)
Equation
#1
wherein:
B is a percentage of time the L-grade stainless steel welding electrode is positively charged;
I p,p is a peak current in an electrode positive polarity of the welding output;
I p,n is a peak (absolute) current in an electrode negative polarity of the welding output;
V p,p is a peak voltage in the electrode positive polarity of the welding output; and
V p,n is a peak (absolute) voltage in the electrode negative polarity of the welding output, and
wherein the first welding output portion is in a range of 35% to 95% of a total duration of the welding output.
10 . The submerged arc welding method of claim 9 , wherein the negative effect is in a range of −700 to 0.
11 . The submerged arc welding method of claim 9 , wherein the negative effect is in a range of −100 to 100.
12 . The submerged arc welding method of claim 9 , wherein the negative effect is in a range of −100 to 0.
13 . The submerged arc welding method of claim 9 , wherein the negative effect is in a range of −80 to 80.
14 . The submerged arc welding method of claim 9 , wherein the negative effect is in a range of −80 to 0.
15 . The submerged arc welding method of claim 9 , wherein the L-grade stainless steel welding electrode has a ferrite number between 6 and 10.
16 . The submerged arc welding method of claim 9 , wherein the first welding output portion is in a range of 45% to 85% of the total duration of the welding output
17 . A submerged arc welding method, comprising the steps of:
providing a submerged arc welding system, wherein the submerged arc welding system includes:
a welding power source which generates a welding output having an AC welding output current;
a welding torch coupled to the welding power source to receive the welding output from the welding power source;
a wire feeder;
an L-grade stainless steel welding electrode delivered to the welding torch by the wire feeder, wherein the L-grade stainless steel welding electrode has a ferrite number between 6 and 10;
a submerged arc welding flux delivery system; and
a controller coupled to the welding power source and that controls the welding power source in accordance with a welding waveform to generate the welding output to the welding torch;
creating a weld on a stainless steel workpiece by the submerged arc welding system, wherein the weld is created using the L-grade stainless steel welding electrode and is suitable for cryogenic applications by having a toughness of greater than 40 foot-pounds at −320° F., wherein the AC welding output current is biased toward DC negative such that the welding output has a negative effect in the range of −700 to 100 per equation #1;
Negative
Effect
=
[
07
*
(
I
p
,
p
*
B
-
I
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
I
p
,
p
+
I
p
,
n
)
+
0.3
*
(
V
p
.
p
*
B
-
V
p
,
n
*
(
1
0
0
-
B
)
1
0
0
)
*
(
V
p
,
p
+
V
p
,
n
)
]
*
(
1
1
0
0
0
)
Equation
#1
wherein:
B is a percentage of time the L-grade stainless steel welding electrode is positively charged;
I p,p is a peak current in an electrode positive polarity of the welding output;
I p,n is a peak (absolute) current in an electrode negative polarity of the welding output;
V p,p is a peak voltage in the electrode positive polarity of the welding output; and
V p,n is a peak (absolute) voltage in the electrode negative polarity of the welding output.
18 . The submerged arc welding method of claim 17 , wherein the negative effect is in a range of −700 to 0.
19 . The submerged arc welding method of claim 17 , wherein the negative effect is in a range of −100 to 100.
20 . The submerged arc welding method of claim 17 , wherein the negative effect is in a range of −80 to 80.Join the waitlist — get patent alerts
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