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Патент USA US3079687

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fa
1
3,07%,h7i
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Patented Mar. 5, 1963
2
able for welding thick plates, for example, plates of
3,079,677
WELDING WIRE FOR LOW ALLEY STEELS
AND RESULTlNG WELD
'
Charies Fehniey, Jr., Livingston, N.J., nssignor to Air
Reduction Company, Incorporated, New York, N.Y., a
corporation of New Yuri;
- No Drawing. Filed Nov. 23, 1959, Ser. No. 854,574
HY—80 steel having a thickness of four inches, and which
may require multi-pass welding with a series of stress
relief-anneals equivalent to 40 hours at approximately
1150° F. It will be understood, however, that other high
strength, low alloy steels may also be welded with the
welding wire of the invention, examples of such steels
being a low alloy steel made in accordance with ASTM—
302, and the low alloy steel known as T-steel.
It is preferred to use the welding wire of the invention
The invention relates to improvements in wire for weld 10
in an inert-gas-shielded electric arc welding process.
ing high yield strength and high impact resistant low alloy
More particularly, it is preferred to use the welding wire
stee s.
in accordance with the basic method described in Muller
_There are certain applications for high yield strength,
et al. No. 2,504,868, April 18, 1950, or as described in
high impact resistant low alloy steels which require that
such steels, and their welded zones, withstand a stress 15 Rothschild et al. No. 2,810,818, October 22, 1957. The
5 Claims. (Cl. 29-1961)
relief-annealing heat treatment, and still be capable of
furnishing ‘a high measure of yield strength, and impact
resistance at low temperatures. ~In weldme'nts of consid
erable thickness, for example, for plates four (4) inches
diameter of the wire electrode, the shielding gas used,
the rate of gas flow, the use of reverse polarity direct cur
rent, the values of current and are voltage, rate of weld
ing, and rate of Wire feed are preferably and essentially
in thickness, many of the welds must be subjected to a 20 the same as described in the Rothschild et al. patent.
The welding wire of the invention may also be used in
series of stress-relief-anneals. Consequently, the weld
other arc welding processes such as that disclosed and
metal may have to withstand an unusually prolonged heat
claimed in United States Patent No. 2,886,696 and in the
treatment, a‘s'much as forty (40) hours at approximately
submerged arc welding process.
1l50° to 1200° F., without incurring adverse elfects in its
In greater detail, plates of HY—80 steel have been
mechanical properties.
"
welded with a welding wire consisting essentially of the
,Accordin'gly,'the primary object of the invention is to
following composition, the amounts indicated being by
provide a Wire or electrode suitable for welding high yield
strength, high impact resistant steels, wherein the wire
furnishes a" weld deposit which has high yield strength
weight:
Percent
.092
and impact properties in the as-welded condition and 30 Carbon
Manganese
2.00
which after the severe degrading e?’ect of the heat treat
Phosphorus ______________________________ _._
.009
ment of the magnitude as aforesaid, affords high values of
yield strength and impact resistance at low temperatures.
Sulphur
.023
This and other objects, and advantages and improved
Silicon
.41
Nickel
____ .53
results will be apparent from the following detailed de
scription of a preferred embodiment of the invention.
Molybdenum
.25
A welding wire made in accordance with the invention
Copper
.81
consists essentially of the following composition, the
The balance is substantially or essentially iron, with traces
amounts indicated being by weight:
of other metals, particularly titanium. The copper, while
Percent 40 preferably included by alloying in the charge or heat from
Carbon _
.04—-.10
which the wire is made, may be provided in the amount
Manganese
1.75~2.10
indicated by copper plating the ?nished wire, which other
Phosphorus ___________________________ __ .020 max.
wise may contain only a trace of copper.
It is preferred to fabricate the welding wire from a
.30-.50 45
heat or charge which has been treated with titanium or a
.45-.70
Sulfur
.025 max.
Silicon
Nickel
Molybdenum
_________________________ __
.20-.40
titanium-bearing deoxidizing agent.
It has been deter
.40—1.40
mined that the use of a selected amount of titanium as the
An example of a steel having high yield strength, and
posit. Preferably titanium in the form of ferro-titanium
Copper
deoxidant for the charge from which the wire is made
The balance is substantially or essentially iron, with traces 50 inhibits grain growth to thereby prevent loss of yield
of other metals.
strength after prolonged heat treatment of the weld de
high impact resistance at temperatures as low as minus
in an amount of the order of 4.0 pounds per ton, or ap
60° F., and which may be stress-relief-annealed for a
proximately 1.8 pounds per ton of equivalent titanium, is
period as long as 40 hours at approximately 1150° to 55 provided by the addition thereof to the charge as the ?nal
1200” F., While still maintaining its high tensile and im
pact properties, is a low alloy steel known as HY-SO.
Such steel is more particularly described in Navy Speci?
deoxidizer. After meltdown, and with the charge up to
temperature, the usual primary deoxidizers, silicon and
manganese may be added, and the charge skimmed. The
cation Mil-S-l62l6B. For plate having a thickness in
ferro-titanium is then added, and after skimming again,
excess of 51.0 pounds per square foot, the composition, 60 the ingot from which the wire is made is then cast.
by percent weight analysis, is as follows:
In the as-welded condition, the weld metal provided
Percent
by a wire having the composition set forth above, and
Carbon
.23 max.
made from an ingot processed as speci?cally described
Manganese ___________________________ __
.10—.40
above, furnished a yield strength, at 0.2% offset, of
Phosphorus
.040 max.
102,750 pounds per square inch. The impact resistance
Sulphur
Silicon
.045 max.
__
Nickel
Chromium
Molybdenum
_________________________ ._..
of the weld metal, in terms of V-Notch Charpy, was 54
foot-pounds at minus 60° F., and 34 foot-pounds at minus
2.68-3.32
100° F.
1.29~—l .91
After the described weldment was subjected to stress
37-63
70 relief-annealing for 40 hours at 1150° F., it exhibited a
.l2-.38
The balance is essentially iron.
The welding wire of the invention is particularly suit
yield strength of 80,350 p.s.i. The impact resistance of
the thus severely heat-treated weldment actually increases,
3,079,677
3
4
furnishing 60 foot-pounds at minus 60° ‘13., and 39 foot
pounds at minus 100° F.
low alloy steels and which provides a weld deposit which
_
after prolonged heat treatment a?ords high values of
yield strength and impact resistance at low temperatures,
said wire consisting essentially of, in approximate amounts
by percent weight analysis, .092 carbon; 2.00 manganese;
It is believed that the advantages of the invention will
be apparent from the foregoing detailed description. The
welding wire provides weldments having high yield
strength and high impact resistance, not‘ only in the as
welded condition, vbut also after stress-relief-annealing for
long periods-
'
'
.009 phosphorus; .023 sulfur; .471 silicon; .53 nickel; .25
molvbdenunpand .81 copper; the balancev being substan~
tially iron, and said wire" being formed from 'a charge
‘
While a prefer-red embodiment of the invention has
which after. meltdown of“ its _ ingredients has a ?nal (1Q:
been described, it will be apparent that various changes 10 oxidizing treatment with titanium in the amount of "1.8
may be made without departing from the spirit and scope
pounds per ton of said charge.
of the invention as set forth in the following claims.
5., A welded product in which low alloy. steel .parts
1 claim;
1. A welding wire for welding high yield strength, high
impact resistance low alloy steels, said wire consisting
essentially of, in approximate amounts by percent weight
having the percentage composition
Carbon,
0
15 Manganese _
Phosphorus
analysis, .04 to .10 carbon; 1.75 to 2.10 manganese; .020,
maximum, phosphorus; .025, maximum sulfur; .30, to .50
silicon; .45 to .70 nickel; .20 to .40 molybdenum; and .40
1.40 copper; the balance being substantially iron.
I 2_.;A welding wire which is suitable for gas-shielded
‘arc, welding of high yield strength, high impact resistance
low alloy steels and which provides a weld' deposit which
after; prolonged’ heat treatment affords high values of
yield; strength and. impact resistance atlow, temperatures,
saidwire consisting essentially of, in approximate amounts
.23 max.
.10,—..,40
Sulphur
Silicon
.040Iniax.
,
,
,.
..
Nickel
v .045 max.
..~
.
,
Chromium
Iron
v
-_
.12738
2.68-3.32
_
..
.
,
_
._
V
V,
'
1.29-1.91
'v"‘-->-._T'-_f>_'1‘?"2"’~1-,1¥.T_-?E-?,¥_._
.
.
.
.
.
_
'
_ Balanee
are joined by electric arc welding with weld ‘metal de
25 posited’ from; a wire electrode having the percentagecom
position
’
'
‘by percent; weight analysis, .04. to .10‘carbon; 1.75 to>2.10
manganese; .020, maximum, phosphorus, .025, maximum,
Manganese
--—-9!-:f-5--.-'-'?€:P7:?—P:!9—rP.-H»—n-e‘
__
, ,‘ 1.75-2.10
sulfur; .30 to .50 silicon; .45 to .70. nickel; .20 to..40
molybdenum; and .40 to 1.40 copper; the balance being 30
substantially iron, and said wire being formed from a
Phosphorus
,
Sulfur
_
Silicon
charge which after meltdown of its ingredients has a ?nal
arc, welding of high yield strength, high impact resistance
low, alloy steels and which providesa weld deposit which
after prolongedheat treatment ,aifords high values of yield
strength. and impact resistance at 10W.t¢mP¢.l'atureS,'Said
wire cqnsistiugessentially of, in approximate amounts by.
Percent weightranalysis. .092. carbon; 200 manganese;
0.0.9. Phosphorus-92.3, sulfur; -4l silicon; .53. nickel; .25
.
.020max,
1,025. max.
,.
y,
_
_
._3,0-.,50
,,
,
,
_
.45-.70
~_'-.-.--2—-r#—-P'-—e--:q—-J—s--.P?q—!
' .40f—1.-4Q
U
..
,
,7
_.
.7
1
‘Balance
References Cited. in the ?le. Qf-thiepatent .
UNITED $.'1"'\..TESv PATENTS.
40'
'
V 4. A welding wire which is suitable for gasrshiel'ded 45
arc j'welding of high yield strength, highimpact resistance
_
Iron.
mablbdenuma and -81 copper; thebalance being subs'tan:
tiellyilton-
,,
M
deoxidizing treatment with titanium in the amount of. 1.8
Molybdenum
pounds per ton of said charge.
3. A", welding wire, which is suitable for gasrshielded 35 Copper
Nickel
v p ,
_
925,659
‘ Schneider __________ _..__ June 22,‘ 1909
2,343,643
Cape ___________ ..,______ Mar. 7, 1944
'2,‘537,207~
Carlson _______ -.._ ____ .. Jan. 9, ‘1951
2,622,978v
2,817,751
2,913,815
2,937,083‘
Andette _________ ________ Dec. 23, ‘1952
Phillips; ___________ __. Dec. 24, 195-’?
Muller ______________ __ Nov. 24, 1,952
Sherwin ________ .._'_____~ May 17,1960
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