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Патент USA US3045120

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July 17, 1962
F. SCHNEIDER ETAL
'
3,045,110
MULTI-FLUX CONTINUOUS ELECTRODE
Filed May 2, 1960
35 33 31
z‘; 21
Freder/c/f. SCI/IVE/DER
Lac/e” G/ROl/ARD
United States Patent 0 "
1
3,045,110
Patented July 17, 1962
2
rials which give off gas on decomposition in the arc, non
gasifying materials whichdo not give off gas on decompo
sition in the arc and optionally up to 50% of a slag-volume
3,045,110
MULTI-FLUX CiJNTiNUOUS ELECTRQDE
Frederick Schneider, Beacons?eld, Quebec, and Lucien
controlling agent. In accordance with the invention, the
?ux is divided into inner and outer layers, the inner layer
being of a'volatile-type ?ux including at least about 80%
of the gasifying materials, the outer layer being of a
mineral-type ?ux including at least about 90% of the
Girouarrl, Montreal, Quebec, Canada, assignors to
L’Air Liquide, Societe Anonyrne pour l’Etude et l’Ex
ploitation des Proce-des Georges Claude, Paris, France
Filed May 2, 1960, Ser. No. 26,047
(Ilaims priority, application France May 4, 1959
9 ?laims. ((31. 219-446)
non-gasifying materials.
The slag-volume controlling
10 agent which is preferably iron powder and an optional
This invention relates to continuous electrodes and
constituent can be contained in either layer or be dis
more particularly to continuous stranded electrodes.
Electrodes of the continuous stranded type are shown
tributed between the layers, i.e., there is up to 100% of
the slag-volume controlling agent, if any, in either layer.
In other words, either layer may contain up to 100% of
the slag-volume controlling agent, the remainder, if any,
being in the other layer.
in the Volif and Savard United States Patent 2,849,593,
August 26, 1958, in the Savard and Vol? copending ap
plication S.N. 679,264, ?led August 20, 1957, and in ‘the
Vollf and Savard copending application S.N. 736,633,
?led May 20, 1958, now Patent 2,938,108, dated May 24,
The selection of a normal ?ux, preferably a ?ux of the
American Welding Society standard classi?cation, for
example cellulosic, mineral, basic, or rutile ?ux, and of
1960.
Continuous stranded electrodesv of this general type
employing small diameter core Wires (say up to_0.080
inch) for ?exibility and having a single ?ux have been
successfully used for welding currents up to 350 amperes
the constituents which appear in the inner layer and those
which appear in the outer layer, will be clear to one
skilled in the art. The gasifying materials are, for exam
ple cellulosic materials which dissociate into carbon mon—
to provide sound quality welds with a tolerable amount
oxide and hydrogen gas, carbonates and oxalates which
of spatter. Using 4-strand and even 7-strand wires having 25 dissociate mainly into carbon monoxide and calcium
a single coating, however, at currents above about 350
?uoride which dissociates into ?orine gas. The remain
amperes the problems start to arise. One problem is
ing constituents of the ?ux are materials which do not
that of auniform weld quality. Another is excessive
gasify but merely melt to form atslag. Iron powder is an
penetration and considerable overheating of the work
exception in that it may or may not be employed in the
piece apparently caused by a jump in the arc voltage to 30 ?ux for the purposes of controlling the volume of the
well over 30 volts. It has been found almost impossible
slag. In this respect it is a special constituent and not
a normal constituent of an electric welding ?ux suitable
for a continuous ?exible electrode.
completely to eliminate weld porosity.
The present knowledge of ?ux composition for the con
ventional arc welding electrode calls for the certain re
quirements to be ?lled for proper arc action and obtain
ing the speci?ed ‘quality; These requirements are (a)
electrical ionization, (Z2) deoxidation and re?ning of weld
metal, (0) protection against atmospheric contamination
/
35
It could also be said that in the segregated multi-?ux
system of the invention, the gas-generating material of
the inner core physically spreads or rather blows the arc
stream which is a flow of electricity and magni?es the
dimension of the electrical current more in its cross
with a slag, (d) production of a gaseous surrounding for
section than in its length, thus creating a condition where
protection of the arc stream, (e) conveying alloying ele 40 the arc voltage can remain in the low range, whereas the
ments. These functions are normally obtained by making
current intensity can be increased to much higher limits,
up ?uxes having a suitable average composition to meet
thus obtaining better decomposition rates and e?iciencies
the convention American Welding Society continuous
without the inconvenience of the deep penetration. De
electric welding electrode classi?cations. The art of
composition rate is a function of current intensity rather
welding is well acquainted with the fact that such mate 45 than of arc voltage.
'
rials are essential for obtaining good quality welds.
Among the inner constituents are cellulose, wood ?our,
In making a continuous 7-stranded electrode using a
soluble cellulose, carbonates of calcium, carbonates of
single ?ux it has been found that the use of the conven
magnesium carbonates ‘of iron, carbonates of manganese
tional average composition of each group gives rise to a
and ?uorspar (calcium ?uoride). Among the outer con
variable degree of improper arc action, excessive spatter
stituents are silica ?our, natural magnesium silicate, nat
and poor mechanical properties. The phenomenon is pro
ural aluminum silicate, oxide of titanium, oxide of iron,
nounced for the classi?cation groups which contain a
oxide of manganese, re?ning alloys, iron powder, sodium
higher proportion of components which give off a gas on
silicate and potassium silicate.
'
decomposition, for instance, cellulosic material or dis
The use of these two fluxes is made possible by a
sociable carbonates, and much less noticeable when mate 55 specially constructed electrode which has a metallic core,
rials of such unstable nature are absent or present in
preferably a stranded core, carrying the gas-producing
minute quantity.
constituents and an external Winding of several wires
about the core and forming in the interstices between the
APPLICANTS’ DEVELOPMENT
wire and core pockets adapted to carry the non-gas-form
The applicants have-now developed an electrode in 60 ing ?ux.
'
'
which the constituents of ,a normal electric welding ?ux
In
a
preferred
method
of
making
the
electrode
of the
of a type which can be employed on a continuous ?exible
invention, the inner layer of ?ux is ?rst extruded on to
electrode are separated into mutually heterogeneous inner
and outer layers in such a manner as to avoid the prob
lems of uni?ux system in which a homogeneous ?ux is
used throughout. According to‘the invention, the elec
trode is made up of a ?exible carrier of Welding metal
which carries-the ?ux which comprises gasifying mate
the core, the external winding wound over the core carry
ing the ?ux and a second extrusion performed in which
the external layer of ?ux is applied.
A continuous stranded electrode of these characteris
tics is capable of excellent performance in welding at cure
3,045,110
3
4
rents over 350amperes with good weld quality and with
To provide the ?exibility required for semi-automatic
out excessive spatter or undue penetration or overheating
welding using a ?exible casing leading to a welding gun
of the workpiece. IIn addition, the electrode has the prop
erty of being effectively ?exible for semi-automatic weld
ing and of providing the slag protection of the outer co at
ing as well as the gaseous shielding provided by the inner
a twisted wire core construction is most desirable.
pable of carrying at least 5% by weight of the consum
coating.
able, combustible type gas-yielding coating.
For
completely automatic welding it would be possible to em—
ploy a solid core of the types shown or the equivalent ca
The invention will be further described by reference
The outer winding is made up of at least two wires‘
to preferred embodiments of it which areillustrated in the
wound at a pitch which can be extruded with a coating
accompanying drawings, and in which:
10 of at least 10% by weight. The three-wire outer coating
is a preferred construction.
'FIGURE 1 is an enlarged view partly broken away
to show the structural features of a length of continuous
Flux
electrode according to the invention.
In the applicants’ multi-?ux system, the coating con
FIGURE 2 is a side view closer to actual size of the
length of electrode according to the invention.
15 stituents have been segregated, with those subjected to
decomposition and which contribute to erratic arc condi
FIGURE 3 is an enlarged cross-section along the line
tion i.e., the gas formers in, the inner coating, and those
3—3 of FIGURE 2.
contributing to are stability in the outer coating. In this
’ FIGURES4, 5 and 6 are cross~sections through alter
manner. the adverse arc characteristics of the inner coating
native forms of core according to the invention.
‘FIGURE 7 is a side elevation of a still further form of 20 constituents are controlled or nulli?ed. Generally speak
ing, this. multi-flux system can be applied to any of the
core according to the invention.
conventional electrode coatings which can be grouped as,
FIGURES‘ 8 and 9 are cross-sections similar to FIG
URE 3 through alternative forms of electrodes according
to the invention showing different types of windings.
follows: cellulosic, mineral, rutile or basic type coatings.
Some of these coating constituents are sensitive to the
_ Referring more particularly to the drawings the elec 25 are heat and decompose in a violent and explosive manner
generally contributing to weld spatter and erratic are
trode of FIGURE 1 is made up of an inner core having a
conditions. These constituents are generally of the gas
central core wire 15 and three separate wires 21, 23 and
forming type, that is on decomposition they evolve a gas.
25- spirally twisted around the core wire 15 so as top-re
Other coating constituents will have a more stabilizing
sent interstices. or pockets between the wires which are
effect on the arccharacteristics. This type of constituent
generally does notldecompose in the arc and is generally
considered as a slag-forming material. In the‘uni?ux
31, 33 and 35, again fonming therebetween, and with the
system the effects of the various constituents are blended
inner core, pockets containing continuous ribbons of ?ux
and are roughly proportionate to their concentration. In
32, 34. and 36.
accordance with the invention, the constituents of the coat
The inner cores shown in FIGURES 4 and 5 and the
ing are segregated into inner and outer layers as has been
windings shown in FIGURES 8 and 9 are cores and wind
described.
ings similar in function to those of the electrode of FIG
It is also impontant that the characteristics and propor
URE- 1. Similar reference numerals have been given to
tion of the ?ux to the metal part of the electrode be
the respective parts .with the exception that they have been
raised by one hundred over the numerals of FIGURE 1. 40 properly selected. For the inner core the proportion of
‘?uxtothe welding wire may range from about 8% to
For example, FIGURE 4 shows a core made up of a pair
about 16% by weight. A preferred range is from about
of ‘helically wound wires 121 and 123. The interstices be—
8%. to about 14%. The amount of ?ux in terms of
tween the wires are ?lled with continuous ?ux ribbons 122
volume may be up to about 50% of the metal with the
and 124. FIGURE 5 shows a core made up of a core
wire 215 and helically wound around it, wires 221, 223 45 two-wire and up to about 30% for the three-wire electrode.
A. preferred coating for the inner core may be basically
and 225. The pockets formed between the core wire 215
of a consumable cellulos-ic type which is capable of giving
and. the outer. wires are ?lled by ?ux ribbons 222, 224
off gas for protection of the weld. This inner ?ux may
and226.
I
contain iron powder in amounts up to 50% by weight.
FIGURE 6 illustrates a solid core 415 drawn to provide
The functionof the cellulosic coating of the inner core
rands 421, 423, 425 and 427 and intervening grooves or
isvto provide basically a gaseous protection for the weld
?ux pockets which are ?lled with ?ux ribbons 422, 424,
metal and in conjunction with.v the outer layer coating, and
426 and. 428.
to provide a low voltage arc.
Likewise FIGURE 7 indicates another type of solid core
For the outer layer, the proportion of ?ux to the outer
315'which is knurled to provide ?ux pockets 322, 324,
layer. welding wire may range fro-m about 20% to about
v‘326, etc.
1
.
1
?lled: with continuous ribbons of flux 22, 24 and 26.
About this inner core is wrapped a winding of three wires
FIGURE 8 shows a core made up of a core wire 515
and. helically wound about it, outer. wires 521 and 523;
flux ribbons 522 and 524. are carriedon the carrier thus
50% by weight. A preferred range is ‘from about 30%
to about 45%.
The amount of ?=ux by volume of the '
outer wires may be up to about 75%.
The coating used for the outer layer may be predom
formed’. FIGURE 9 shows .a core made up of a core wire
615 and outer wires 621, 623, 625 and 627. The car 60 inantly of, the rutile type. As the volume of ?ux in propor
tion of the welding wire is high, iron powder may be
rier so formed carries in the. intersticesbetween the core
added to the outer layer coating in ‘amounts as stated
and:outer wires ?ux ribbons 622, 624, 626 and 628.
elsewhere. The fundamental function of the outer coat
DETAILED CHARACTERISTICS
ing is to provide a slag~type protection of the weld metal
WIRES ,
65 and in conjunction with the inner core coating provide
a low voltage arc. The densities of the ?uxes or coating
The above description gives the fundamental construc
after extrusion would range between 1.5 to 2.7.
tion of the continuouspelectrode,but in order that it per
Examples of specific types of flux which can be
form successfully certain other speci?cations are required.
employed as the ?ux content of the electrode are shown
For example, the wires should be of a ‘size within the
and arepreferably circular in cross-section. A preferred 70 in Tables 1 and 2. In accordance with the invention
theconstituents of each type of ?ux are segregated into
range of diameter is from about 0.040 inch to about 0.045
inner and outer layers in accordance with the principles
inch. _ The 'preferredrnetal of the .wires is standard mild
elucidated above. The constituents which are placed in
steel electrode core wire, but the broader principles of the
the respective layers have been so identi?ed. The amounts
invention ‘apply to wires made of other welding grade
metal.
.
75 are percentages by weight of the total flux.
5
6
{TABLE 1
ployed in, for example, United States Patent 2,849,593
namely
Cellulosic
American Welding Society
Classi?cation
E 6010
Mineral
Mineral
E 6020
E 6027
(a) Twisting of bare inner core.
(b) Coating of inner core by extrusion.
(c) Twisting of bare outer layer wires.
E 6011
Silica Flour (0) ________________________________ __ 5-15_____ 5-15.
Naiéuyral Magnesium Silicate
15-30
15-25
up to 10
up to 10
Natu)ral Aluminum Silicate __________________ __ up to 10- up to 10
Oxide of Titanium (0) _____ __
15-30
15-30
Oxide of Iron (0)..
5-15_____ up to 5.
5-1s
15-25.
10
a die which produces a 5% reduction in total diameter
in order to seat the peripheral wires on the center core.
Oxide of Manganese (O) _______________________ __ 5—20___-_ 10-20
Cellulose:
~
, (a) Wood Flour (1) ____ __
20-35
(b) Soluble (I) _________ __
'
Carbonates of Calcium (I).__
2-5
20-30
________ __
___
Caiibonates of Magnesium
This is desirable to eliminate any possible disturbance of
up to 5__ up to 3.
up to 2-.
up to 2.
5-1‘)
5-10.
the wire pitch during subsequent processing. Extrusion
pressures will vary between about 100 and about 300 psi.
up to 5__ up to 5.
The setting temperature of the multi-?ux will vary be
Carbonates of Iron (I)____._- __________________ ._ up to 10. up to 10
Carbonates oi Manganese (I) .l __________________ __ up to 15- up to 10
Re?ning Alloys (0). _______ _7-15
7-15 l0—20____ 5-15.
Iron Powder (0 and 1)
tween 200 to 600° F.
plication of the outer coating followed by a second heating
operation. In the setting operation ‘the wires are heated
at moderate temperatures, for example in the case of rutile
and mineral type coatings to about 200° F. to 300° F.,
and for lime ferritic type coatings up to about 500° F. to
about 600° F. The physical characteristics of the ?uxes
(or slag) as deposited will be very similar to that obtained
with standard electrodes-of the same coating type. On
drying, the flux is keyed to the wires.
In use, the multi-?ux system of the invention results in
(O) =outer layer.
(I) =inner layer.
TABLE 2
'
Rutile
American W.S.
.
Basic
Classi?cation
E 6018
E 6012
E 6013
E 6014
E 6024
a much more stable and a lower voltage are than if the
30 inner and outer coatings were mixed and applied as a
Silica Flour (O)___ up to 5__ up to 5__ up to 5__ 5-15_____
Natural Magne-
5—10_____ 5-10_____ up to 10_ ________ ..
Natural Alumi-
10—20____ 5-10.____ 5-10.____ 5—15_....
sigm Silicate
213? Silicate
\
Oxide of Tita-
homogeneous single coating. The applicants have ob
served with a given multi-?ux wire that the arc voltage is
at ‘least 5 volts lower than for the single ?ux type coating.
The capability of the multi-?ux electrodes in terms of volt
age and amperage varies for each type of multi-?ux coat—
ing and also for each size of wire. The electrodes of the
v
30-40-... 15-30--.- 15-30.-.. 10-25__-_ up to 7.
nium (O).
Oxide of Iron (0) _ _
'
Oxide of Manga
nese-(O).
invention are ?exible and can be ?exed to a diameter of
.
Cellulose:
(a) Wood
about 6 inches without producing any coating failure. The
2-8 ____ __ l0—20____ 5-l5___._ up to 5__
Flour (1). -
(b) Soluble (I)_
carbonates of
Calcium (I).
Carbonates of
Magnesium (I).
-
up to 2..
up to 10- up to 10- up to 5__ _________ -, 20-30.
multi-?ux electrodes are used similarly to uni?ux elec
40 trodes. The welds obtained have been found to be ex
cellent. The physical properties and decomposition rates
up to 5__
will vary for each type of coating and each wire size.
The invention will be further described by reference to
‘
Carbonates of
Iron (I).
carbonates 0f
the accompanying example which illustrates speci?c pre
Manganese (I).
Reigning Alloys
5-15_____ 5-10.
Iron Powder
25-35____ 20-30.
Sodium Silicate
up to 25. up to 20.
Potassium Silicate (0 and I) .
10—20-.__ 15-25____ 7-15_____' up to 25_ up to 20.
(0 and I).
O and I).
For some of the multi-?ux wires
it may be necessary to heat the inner coating prior to ap
30-50.
Sodium Silicate (O and I).___
35-45 __________________ _. up to 25
Potassium Silicate (O and I)_ ________ __
30-40 20—30____ up to 25
Fluorspar (I) __
.
(d) Coating of outer layer by extrusion.
(e) Setting.
(1‘) Spooling.
In the stranding operation, the wire is passed through
Fluorspar (I) ____ __ _
-_
45 ferred aspects of the invention not to‘ be considered in a
limiting sense.
EXAMPLE
An electrode was manufactured according to the follow
ing speci?cation.
Inner core:
15-30.
_
Wires-4 strands of 0.040 inch diameter. ,
Pitch of wires—1.85 times total diameter of inner
- (O)=outer layer. 7
' (I)=inner layer. ,
~
Each of the constituents has been identi?ed with the
symbol “0”. or “I” meaning outer or inner.
Each of the
materials noted ’ “I” will predominantly appear in the
ers which may appear in both outer and inner layers. The
Coating—rutile flux of the type described, below.
The inner ?ux layer was made up of the following con
stituents:
iron powder is a‘supplement to the normal ?ux which
>
Percent by weight
For
Asbestos
65
upon, at least eighty percent of its gas-forming constituents,
preferably ninety percent or more, and usually ninety
26
Cellulose
__
Perm-manganese
____________________________ _ _
Potassium-silicate
stituents:
will be placed in the outer layer. This does not include
the iron powder, which is a special supplementary mate
Feldspar
layer. At least 90% of the non-gas forming constituents
_____ __
__
__ _ _
26
8
40
The outer ?ux layer was made up of the following con
?ve percent or more, are placed in the inner layer. The
balance of ‘the gas formers, if any, is placed in the outer 70
'
'
Percent by weight
Rutile
______
_»_
‘
_______________________ _; __________ __
_37_
13
Perm-manganese ____________________________ __ 15
‘ rial and which may appearin either layer.
The manufacturing procedure is similar to that em
.
Outside diameter of electrode-0.20 inch. .
ing ‘materials, but usually slag formers and will appear in 60
the outer layer. The sodium potassium silicates are bind
is vthat, when the total ?ux which is to be used is decided
7
Pitch of outer wires-1.0 times total diameter of wire.
The materials identi?ed with “0” alone are not gas-form~
the‘purposes of the present invention, the important aspect
=
Wires-3 strands of 0.040 inch diameter.
inner layer .of ?ux, since these are gas~forming materials.
may appear in either the outer or the inner layer.
core.
Coating-cellulosic ?ux of the type described below.
55 "
Outer layer:
Cellulose ___________ __-_ _________ ..
75
1
Potassium silicate ________________ __'_ _' ________ __ 34
3,045,110
d
_The current voltage relationship of the above type of
shown in the table below.
5. A continuous flexible arc Welding electrode, compris
'
ing, a ?rst winding of a plurality of wires wound helical
ly with a substantially constant spacing, a second winding
of a plurality of wires wound helically with a substantially
Single
Double
direction, all said wires being of mild steel and of a diame
Extruded
Wire
Ex
truded
Wire
wire as compared to previous single extruded wire is
'
constant spacing around said ?rst winding in the opposite
Minimum Current ______________________ "amps"
275
225
Maximum Current __________ ._
___amps._
375
425
Are Voltage at Min. Current“
___volts._
28
15
Are Voltage at Max. Current _____________ __volts__
34
24
ter within from about .035 to about .078 inch, a ?rst coat
ing of welding ?ux of a ?rst kind in the interstices of said
?rst winding, and a second coating of welding ?ux of a
second kind in the interstices of said second winding, a
portion of at least the outer edges of the wires of said
second‘ winding being bare. for electrical contact, said ?rst
coating being of a volatile-type ?ux giving oif gases on
decomposition in the arc, and said second coating being
15 of a mineral-type ?ux, at least one of the 2 coatings con
We claim:
taining a slag volume controlling agent.
1. A continuous ?exible arc welding electrode, compris
6. A continuous ?exible arc welding electrode, com
ing, a ?rst winding of a plurality of wires wound helically
prising a ?rst Winding of a plurality of wires wound heli
with a substantially constant spacing, a second winding
cally with a substantially constant spacing, a second wind
of a plurality‘ of wires wound helically with a substantially
constant spacing around‘ said ?rst Winding in the opposite 20 ing of a plurality of Wires wound helically with a sub
stantially constant spacing around said ?rst Winding in
direction, all said Wires being of mild steel and of a diam
the opposite direction, all said wires being of mild steel
eter within from about .035 to about .078 inch, a ?rst
and of a diameter Within from about .035 to about .078
coating of welding ?ux of a ?rst kind in the interstices of
inch, a ?rst coating of welding ?ux of a ?rst kind in the
said ?rst wind-ing, and a second coating of welding ?ux of
a second kind in the interstices of said second winding, a 25 interstices of said ?rst winding, and a second coating of
welding ?ux of a second kind in the interstices of said
portion of at ‘least the outer edges of the wires of said
second winding, a portion of at least the outer edges of
second winding being bare for electrical contact, said ?rst
the wires of said second winding being bare for electrical
coating being of a volatile-type?ux giving o?‘. gases on
contact, and said second coating beingof a mineral-type
decomposition in the arc, and said second coating being of
30 ?ux, the proportion of flux to Welding Wire on the ?rst
a mineral-type ?ux.
' 2. A continuous ?exible arc welding electrode, compris
ing, a ?rst winding of a plurality of wires wound helically
with a substantially constant spacing, a second winding of
a plurality of wires wound helically with a substantially
constant spacing around said ?rst winding in the opposite
direction, all said wires being of mild steel and of a diam
layer being from about 8% to about 16% by weight, the
proportion of ?ux to Welding wire on the second layer
being within the range from about 20% to about 50% by
weight.
7. A continuous ?exible arc welding electrode, com
prising a ?rst winding of a plurality of wires wound heli
cally with a substantially constant spacing, a second wind
ing of a plurality of wires wound helically with a substan
tially constant spacing around said ?rst winding in the
eter within from about .035 to about .078 inch, a ?rst
coating of welding flux of a ?rst kind in‘the interstices of
said ?rst winding, and a second coating of welding flux
of ajsecond kind in the interstices of said second winding, 40 opposite direction, all said wires being of mild steel and
of a diameter within from about .035 ‘to about .078 inch,
a portion of at least the outer edges of the wires of said
a ?rst coating of welding ?ux of a ?rst kind in the inter
second winding being bare for electrical contact, said ?rst
stices of said ?rst winding, and a second coating of weld
coating being of a cellulosic-type flux and said second coat
ing ?ux of a second kind in the interstices of said second
ing being of a rutile-type ?ux.
winding, a portion of at least the outeredges of the wires
3'. A continuous ?exible arc welding electrode, compris
of said second winding being bare for electrical contact,
ing, a ?rst winding of a plurality of wires wound helically
said ?rst coating being of a volatile-type ?ux giving oif
with a substantially constant spacing, a second winding of
gases on decomposition in the arc, and said second coating
a plurality of wires wound helically with a substantially
being
of a mineral-type ?ux, therwires being of a size
constant spacing around said ?rst winding in the opposite
within the range of .040 inch to about .045 inch in di
direction, all said wires being of mild steel and ofa diam
ameter.
eter within from about .035 to about .078 inch, a ?rst
8. A continuous ?exible arc welding electrode, com
coating of‘welding ?ux of a ?rst kind in the interstices
prising a ?rst winding of a plurality of wires wound heli
of said ?rst winding, and a second coating of welding ?ux
cally with a substantially constant spacing, a second wind
of a second kind in the interstics of said second winding,
ing of a plurality of wires wound helically with a substan
55
a portion of atleast the outer edges of the wires of said
tially
constant spacing around said ?rst winding in the
second winding being-bare for electrical contact, said ?rst
opposite direction, all said wires being of mild steel and
coating containing from 30% to 90% ofd-issociable min
of a diameter within from about .035 to about .078 inch,
eral carbonates and said second coating being of a basic
a ?rst coating of welding'?ux of a ?rst kind in the inter
type ?ux.
’
'
4. A continuous ?exible arc welding electrode, compris 60 stices of said ?rst winding, and a second coating of weld
ing flux of a second kind in the interstices of said second
ing, a ?rst windinguof a plurality of wires wound helically
winding, a portion of at least the outer edges of the wires
with a substantially constant spacing, a second. winding
of said second winding being bare for electrical contact,
of aplurality of wires Wound helically with a substantially
said ?rst coating being of a volatile-type v?ux giving off
constant spacing around said ?rst winding in the opposite
gases on decomposition in the arc, and said second coat
direction, all said wires being of mild steel and of a diame
ing being composed of a mineral-type ?ux, the winding
pitch of both layers being about 1.85 times the diameter
coating of welding ?ux of a ?rst kind'in the interstices
of the core wire.
of said ?rst winding, and. a second coating of welding ?ux
of a second kind in the interstices of said second winding, 70 9. A ‘continuous ?exible arc welding electrode, com
prising a core wire, a ?rst layer of 3 wires wound helically
a portion of at least the outer edges of the wires of said
with a'substantially constant spacing around said core
second winding being bare for electrical contact, and said
wire, a second layer of 3 wires wound helically with a sub
second coating being of a mineral-type ?ux, at least one
stantially
constant spacing around said ?rst layer in op
of the 2 coatings containing iron powder, forming from
15% to 45% of the total weight of the two coatings.
75 posite direction, all said wires being of mild steel and of
ter within from about .035 to about .078 inch, a ?rst
3,045,110
10
9
substantially the same diameter, a ?rst coating of welding
?ux of a ?rst kind in the interstices of said ?rst layer of
wires, and a second coating of welding ?ux of a second
kind in the interstices of said second layer of wires, a por
tion at least of the outer edges of the wires of said second
layer being bare for electrical contact, said ?rst coating 5
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,517,311
1,944,753
2,430,701
Motte ________________ __ Dec. 2, 1924
Mathias _____________ __ Jan. 23, 1934
Bernard _____________ __ Nov. 11, 1947
707,542
Great Britain _________ __ Apr. 21, 1954
being of a volatile-type ?ux giving off gases on decom
position in the arc, and said second coating being of a
mineral-type flux.
FOREIGN PATENTS
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