DE1265551B - Tube electrode for welding alloy steel with high tensile strength - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. CL:

B 23 k

German class: 49 h - 36/01

Number: 1265 551

File number: H 54120 VI a / 49 h

Filing date: October 23, 1964

Open date: April 4, 1968

The invention relates to a tubular electrode for welding alloy steel of high tensile strength in the order of 63 to 67 kg / mm ² with a jacket of a strip of mild steel or the like, which is essentially folded in the form of a tube and a core filling inside the mantle.

It is a tubular electrode for build-up welding of stainless steel onto the surface a workpiece known, which is made of an unalloyed carbon steel or a low-alloy Steel is made. The known tube electrode has a filling tube or a jacket for this purpose Steel with a low carbon content of up to 0.10% carbon and a core filling that consists of 41 to 43% ferrochrome, 18 to 24% nickel, 4 to 8% ferro-molybdenum, and 0.5 to 2% electrolytic Manganese exists. Because the ferrite retained in the weld deposits through this tube electrode is approximately predeterminable, the crack formation under the weld deposits can be contained favorably will. However, the composition of the core filling of the known tubular electrode does not make it possible their use for welding alloy steels of high tensile strength.

The invention is therefore based on the object to provide a tube electrode with or without Shielding gas can be used for welding high tensile strength alloy steel, the The jacket and the core filling of the tubular electrode should be such that when the electrode melts a weld is formed with a composition that, although not exactly identical to the Composition of the alloy steel needs to be high tensile strength, but is compatible with this and has physical properties similar to the welded steel.

According to the invention, this object is achieved in that the jacket of the electrode is formed from a strip of unalloyed steel with up to 0.10% carbon and that the core filling consists of a mixture of 0 to 80% iron powder, the remainder alloying components and deoxidizing agent, the remainder in turn comprised of 5.7 to 10.3% low carbon ferrochrome, 10.0 to 18.4% ferro-molybdenum, 28.3 to 44.5% ferro-manganese, 0 to 16.2% ferro-silicon and 25.5% 46.6% nickel. A tubular electrode with such a core filling is advantageous when welding an alloyed steel of high tensile strength, for example 0.10 to 0.20% carbon, 0.60 to 1.0% manganese, 0.15 to 0.35% silicon, 0 , 70 to 1.0% nickel, 0.40 to 0.80% chromium, 0.40 to 0.60% molybdenum, 0.03 to 0.10% tubular electrode for welding alloyed
High tensile strength steel

Applicant:

Hobart Brothers Company,

Troy, Ohio (V. St. A.)

Representative:

Dr. H.-H. Willrath, patent attorney,

6200 Wiesbaden, Hildastr. 18th

Named as inventor:

Gerard Eden Claussen, Troy, Ohio;
Henry Bernard Bryan,
Tip City, Ohio (V. St. A.)

Claimed priority:

V. St. v. America November 8, 1963 (322 321)

Vanadium, 0.15-0.50% copper, 0.002-0.006% boron, no more than 0.04% phosphorus and no more contains than 0.05% sulfur.

With the electrode according to the invention, commercially available steels of similar quality as the Steel with the above composition can be welded. The tube electrodes according to FIG Invention are also useful for welding other alloy steels with high tensile strength which several of the above-listed components are significantly changed to different ones achieve desired characteristics of the steel while maintaining strength properties will.

The invention will then be described in more detail with reference to several exemplary embodiments and the drawing.

Fig. 1 is a perspective view of a Tubular electrode according to the invention;

F i g. Figure 2 is a cross-section through the tube electrode of Figure 2. 1 on an enlarged scale.

809 537/332

3 4

The tube electrode according to the invention has This composition has been made for an electrode

a jacket 12 which has a core filling 13 selected for welding with CO ₂ shielding gas. That closes. The jacket 12 is in the illustrated embodiment. Iron amount is not essential. It can be formed from a strip of mild steel with a suitable width and thickness of about 50% or even up to 70 or 80% changed from 0.0 to play. Only be an example. To a large extent this depends on the size of the strip, which can have a width of about 9.7 mm of the tube and the inner diameter of the tube and a thickness of about 0.076 mm. The one to be filled with the powder. The Ande-strip is deformed by bending into a hollow tube of the constituent parts of the core filling, however, should have an outer diameter depending on the relationship to one another within the following shaping measures applied to its original width and thickness and the appropriately approximated areas. The FeMo 10 0 to 12 2 ⁰ I

Said strips can for example be rolled and then drawn FeCr 57 to 6 9 ⁰ I

be to a tube with a diameter of nickel 25'5 to 3ΐΊ ⁰ I

to form about 2.37 mm. Strips of other sizes can- ρ g ^ o to 16 2 ⁰ I.

of course with many different designs. 15 FeMn 357 to 43 7 ^Q I

shapes to form tubes with different '' ^{/ o}

Diameters are needed. For example, B e i s ρ i e 1 2

Strips 13.005mm wide and _B thick in another embodiment of the invention

1.05 mm thick for forming pipes with a _{jacket having the} same properties as forming a diameter of 4.763 mm by rolling the 20 given _above , in terms of size and composition, into pipes or otherwise using them. This electrode was formed and then to weld the pipes to the desired ß _{s m t} j an argon protective gas determined. The zuDurchmesser were drawn. Strips of a composition of the core filling were as follows: width of about 6.99 mm and a thickness of

0.635 mm and strips 4.83 mm wide 25 f; ⁰ ®? -nc \ S ^ 2 ₀ (°

and a thickness of 0.466 mm are also used pp ° ^ ^g v? o /

been. Stripes of this kind can have many different xrv ^ n ^ λα λοι °

which dimensions are used. After for- ir ^. \ nn ^g ι ■? <> /

tion of the pipes, especially when it comes to i, ^e ~ j. ;; · ■ '- § ^ Jo

If the pipes are of moderate size, they will usually be 30 FeMn 170.0 g 18.5 / ₀

drawn to smaller diameters. If desired, total 933.0 g 100.0%

can reduce the thickness of the mild steel strip and,.,.,.

the amount of iron powder in the core, as in the after- Again, the amount of iron is not critical

The example shown is to be increased and can be from 0.0 to about 60% and even given or instead the thickness of the strip is increased and 35 * ^{all bl} ?. ^z " ^{70 or 80 / o can be changed} · Again the amount of iron powder can be reduced. The amount of iron depends somewhat on the size of the height

The sheath is, as mentioned, of a flux ^lu "S f ^{1 l} ™ ^{em of the} jacket from. The other constituent steel or wrought iron. Such Flußstahlstrei- ^parts of the core composition but are m a ratio fen referred to as 1010 steel strip and has each other within approximately the following ranges have a composition of 0.03 to 0.10% carbon 40 ^:

material, 0.30 to 0.60% manganese, 0.0 to 0.04% Phos- FeMo 11.4 to 14.0%

phosphorus, 0.0 to 0.05% sulfur, 0.0 to 0.03% silicon, FeCr 6.5 to 7.9%

Remainder iron. The percentage of these elements in nickel can be 29.1 to 35.5%

changed within an appropriate framework, but the FeSi 6.5 to 7.9%

the above analysis is particularly advantageous. 45 FeMn 36.5 to 44.4%

This jacket was put together in this way and was used during B e i s d i e 1 3

of manufacturing and shaping with the core material. . , .... , ". ,

filled and closed when completely filled. ^Be j ^{another "e} " embodiment of the invention

The tubular electrode consisted of a round tube ^was " ^{n Man} !" ^e l ^{_u S (l ben} "properties as described above and filling the core, namely the jacket 50 made stated in terms of size and composition of approximately 82.5% and 17.5% of the core composition used. This electrode was used for welding total weight The core filling can, however, be "" ■ ^rd f ^kt * ^m arc under a neutral 16 to 20% of the total weight of the electrode Flux The composition of the core filling was as follows:

Example 1 ^{55 Iron 555} S ⁶⁰ ' ^2%

^F FeMo 53 g 5.7%

In one embodiment of the invention, FeCr 30 g 3.2 ° /

the following approach of substances for the formation of the nickel 135 g 14 * 6 ° / o

Core filling used. The information relates to p _e gi 20 g 2 ', 2 ° /

on percent by weight. 6 ₀ FeMn 130 g 14.1%

Iron 455 g 48.7% Total 923 g 100.0%

^e ° ^g _ ' J. ⁰ Again, the amount of iron is not critical

1/1 Vo / ^{0 and} d can be from 0.0 to about 65% or even up to

J / .1 oc 1 aVo /

¹ ^ j ^{g 1} ^ J ⁰ 65 70 or 80% modified. Again depends

Pg j ^ J

_p ^e * 1 on ^ in / 101 the amount of iron something of the size of the cavity in the

^temn JzHi ^{ΖΌΑ lo} inside the mantle off. The other components of the

A total of 933 g 100.0% core filling should, however, in a ratio to

are within approximately the following ranges:

FeMo 13.0 to 15.8%

FeCr 7.3 to 8.9%

Nickel 33.1 to 40.5%

FeSi 4.9 to 5.9%

FeMn 31.8 to 38.8%

Example 4

In another embodiment of the invention, a jacket was used which had the same properties, as indicated above, in terms of size and composition. The electrode was used for Welding with a flux of high manganese and medium silicon content, such as with a Hobart flux H-400. The composition of the core was as follows:

Iron 615 g

FeMo 53 g

FeCr 30 g

Nickel 135 g

FeMn 100 g

66.0% 5.7% 3.2%

14.4% 10.7%

Total 933 g 100.0%

Again, the amount of iron is not critical and can be from 0.0 to about 70%, or even optionally can be modified up to about 80%. Again, the amount of iron depends somewhat on the size of the cavity inside the coat. The other components of the core filling should, however, in one Relationship to each other are within the following areas:

FeMo 15.0 to 18.4%

FeCr 8.5 to 10.3%

Nickel 38.2 to 46.6%

FeMn 28.3 to 34.7%

As stated above, this is the amount of practically pure iron powder in the core filling of the electrode not essential.

In Examples 1 to 4 the amount of iron varies from 48 to 66% by the possible variations To explain further, Examples 5 to 8 show the compositions of core fillings according to the invention similar properties with variations in the amount of iron from 0.0 to 48%.

Example 5 Welding with CO ₂ shielding gas

Iron 0.0 g

FeMo 103.0 g

FeCr 59.0 g

Nickel 265.0 g

FeSi 137.0 g

FeMn 369.0 g

Total 933.0 g

Example 6 Welding with argon shielding gas

Iron 100 g

FeMo 105 g

FeCr 60 g

Nickel 269 g

FeSi 60 g

FeMn 339 g

Example 7

Welding with a concealed arc
under neutral flux

Iron 250 g

FeMo 97 g

FeCr 55 g

Nickel 248 g

FeSi 36 g

FeMn 237 g

Total 923 g

Example 8

Welding with a concealed arc
under flux H-400

Iron 450.0 g

FeMo 80.5 g

FeCr 45.5 g

Nickel 205.0 g

FeMn 152.0 g

Total 933.0 g

Below is the manner in which electrodes formed in accordance with the invention are used in welding of high tensile strength steel alloy with low carbon content and relatively small amounts on manganese, silicon, nickel, chromium and molybdenum. The tubular electrode according to the invention, as described above, is brought into close proximity to the workpiece to be welded. A Shielding gas is provided around the point where the electrode is applied to the workpiece. This protective gas can pure carbon dioxide, pure argon, pure helium, a mixture of argon and carbon dioxide, a mixture of helium and carbon dioxide, a mixture of argon and oxygen, a mixture of helium and oxygen or any other suitable protective gas or mixture. Electric current, which creates an arc, is then passed through the electrode and between the electrodes and workpiece passed through. In the process, the jacket and the core filling it encloses melts at the end of the electrode near the workpiece and deposits molten weld metal from it on the Workpiece. The electrode is then from the workpiece or the workpiece from the electrode removed so that the weld proceeds on the workpiece. Similar methods are used when the electrode is intended for use in submerged arc welding is.

60

Total 933 g

Claims (1)

Patent claims: 1. Tubular electrode for welding alloy steel of high tensile strength in the order of 63 to 77 kg / mm ² with a jacket of a strip of mild steel or the like, which is essentially folded in the form of a tube, and a core filling within the jacket , characterized in that the jacket is formed from a strip of unalloyed steel with up to 0.10% carbon and that the core filling consists of a mixture of 0 to 80% iron powder, the remainder alloying components and Deoxidizer consists, with the remainder in turn from 5.7 to 10.3% ferrochrome with low Carbon content, 10.0 to 18.4% ferromolybdenum, 28.3 to 44.5% ferromanganese, 0 to 16.2% ferrosilicon and 25.5 to 46.6% nickel consists. 2. Electrode according to claim 1, characterized in that the jacket consists of a steel strip from 0.03 to 0.10% carbon, 0.30 to 0.60% manganese, 0.0 to 0.04% phosphorus, 0.0 to 0.03% Silicon and 0.0 to 0.05% sulfur, the remainder iron is formed and the core filling next to the iron powder to the rest of a mixture whose composition 8.1% ferrochrome with low Carbon content, 14.4% ferromolybdenum, 35.3% ferromanganese, 5.4% ferro-silicon and 36.8% nickel 3. Electrode according to claim 1, characterized in that the remainder mentioned in claim 1 from 7.2% ferrochrome with low Carbon content, 12.7% ferro-molybdenum, 40.6% ferro-manganese, 7.2% ferro-silicon and 32.3% nickel consists. 35 40 4. Electrode according to claim 1, characterized in that the remainder mentioned in claim 1 from 9.4% ferrochrome with low Carbon content, 16.7% ferromolybdenum, 31.5% ferromanganese and 42.4% nickel
consists. 5. Electrode according to claim 1, characterized in that the remainder mentioned in claim 1 from 6.3% ferrochrome with low Carbon content, 11.1% ferromolybdenum, 39.6% ferromanganese,
14.7% ferrous silicon and 28.3% nickel
consists. 6. Electrode according to claim 1, characterized in that the remainder mentioned in claim 1 7.3 to 8.9% low carbon ferrochrome, 13.0 to 15.8% ferro-molybdenum, 31.8 to 38.8% ferro-manganese, 4.9 to 5.9% ferrous silicon and 33.1 to 40.5% nickel
consists. 7. Electrode according to claim 1, characterized in that the remainder mentioned in claim 1 8.5 to 10.3% ferrochrome and lower Carbon content, 15.0 to 18.4% ferromolybdenum, 28.3 to 34.7% ferromanganese and 38.2 to 46.6% nickel consists. References considered: U.S. Patent No. 3,101,405. 1 sheet of drawings 809 537/332 3.68 © Bundesdruckerei Berlin