DE2034973C - Covered electrode for arc welding of steel - Google Patents

Description

At present we are getting to an increasingly broader one

Various uses for arc welding- The core has the following composition:

similar types of steel without subsequent heat treatment - 0.04% carbon, 0.2% silicon, 5.0% manganese, development nickel-based electrodes made with carbon, 6.0% molybdenum, 55.0%, nickel, 0.25% titanium, remainder Silicon, manganese, molybdenum, chromium, tungsten and 4 ° iron.

other elements are legitimate. The presence of molybdenum (6.0%), manganese

One of the electrodes used for such purposes (5.0%) and titanium (0.25%) make it possible to use a consists in percent by weight of a core with weld metal that is against the formation of maximum warmth 0.12% carbon, at most 0.8% silicon, is resistant to cracks and prevents the formation of silicon, maximum 0.7% manganese, 78% nickel, 0.15 45 pores when welding. The presence of at least Up to 0.35% titanium, 19 to 22% chromium, the remainder iron and 55.0% nickel in the weld metal ensures this a coating compound of the calcium fluoride type, achieving welded joints with good fogging Contains 25 to 35% molybdenum. drive properties without brittle crystallization and

The D'Tusion intermediate layers deposited with the aforementioned electrode in the melting zone of the weld metal are forming elements with large amounts of active carbide welded joints of various steels, namely with 19 to 22% chromium
and 14 to 15% molybdenum alloyed into this from the

Sheathing compound pass over what is in the weld metal example 2

if the welded connection has not been used for a longer period of time

elevated temperatures too low deformability 55 The core has the following composition: due to the increased tendency of the weld seams to 0.06% carbon, 0.30% silicon, 7.5% manganese, Dispersion hardening leads. 7.0% molybdenum, 60.0% nickel, 0.60% titanium, remainder

Next to it is the iron deposited with this electrode.

Weld metal for the formation of pores during welding. Welding with the encased electrode

inclined. The object of the invention is to develop the core wire of the composition mentioned a coated nickel-based electrode to ensure the achievement of a weld metal of high Manufacture of welded joints at different formability that does not tend to dispersion hardening like steels and especially for repairing and welding against the formation of pores and hot cracks of casting defects in heat-resistant is constantly.

Steels that achieve a weld metal with a good 65 The following table shows mechanical properties guaranteed. shafts of said weld metal at 20 and

A covered electrode is proposed for this purpose, 565 ° C. in the initial state after welding which consists of a core wire, the carbon, silicon, again:

3 <* ..!
kp / mm ¹ Λ
° / o 4th kpm / cm ^: Test temperature ° C «Β
kp / mm ¹ 28.2 to 33.3 39.7 to 45.5
42.6
33.0 to 37.4 ψ
Vo 15.6 to 16.5 20th
565 52.9 to 55.9 30.7
29.3 to 34.1 35.2 50.1 to 59.3
54.2
38.6 to 48.2
43.5 16.1 54.4
40.1 to 45.6
42.6 31.2

wherein

ψ =

Tensile strenght,
FliePigrenze,
relative elongation,
relative constriction,
K c -bsch '. Toughness

mean.

After aging for 10,000 hours at 565 ° C, the notched impact strength is the with the Core wire of the stated composition deposited weld metal 11.9 kpm / cm *.

Example 3

The core can also have the following composition: 0.08% carbon, 0.5% silicon, 10.0% Manganese, 7.5% molybdenum, 65.0% nickel, 0.90% titanium, the remainder iron.

With this ratio of the components in the core wire, a weld metal is obtained which is resistant to formation is resistant to hot cracks and pores.

With a maximum nickel content of 65.0% in the core, the linear expansion coefficient is close the linear expansion coefficient of the thermal

ao resistant steels. The. The linear Expansion coefficient eliminates the possibility of cold cracks in the area of the seam when welding defects in pearlite casting. The table below shows the values of the linear expansion coefficients of weld metal with the electrode according to the invention of the composition mentioned and the pearlite class cast steel at various temperatures specified.

material 20 to 100 20 to 200 temperature
20 to 300 Area, 'C
20 to 400 20 to 500 20 to 565 Weld metal 14.3
12.0 14.4
12.09 14.5
12.85 14.55
13.46 14.6
14.73 14.8
15.20 Pearlite class steel

The calcium fluoride type cladding compound of the electrode according to the invention can be expressed in percent by weight made of 20 to 40% marble, 15 to 30% river s.at., 10 to 20% metallic manganese, 10 to 20% Titanium dioxide and 1 to 2% potash with water gas as a binder.

The welding with the covered electrode according to the invention ensures the achievement of a Weld metal without pores and hot cracks as well as good separability of the slag crust makes it possible to carry out the welding process in any spatial position, and ensures a high Arc stability.

To improve the conditions for production the coating compound and its application to the electrode core is in this potash in introduced in an amount of 1 to 2%.

During the production of the sheathing compound occurs

the potash interacts with the binding agent, the water glass, and thereby fulfills the role of Plasticizer »which makes it possible to have an elastic and at the same time hard coating compound receive. In addition, the potash has a beneficial effect on the burning of the arc by increasing its stability and lowering the ionization potential of the arc section.

Claims (1)

Contains manganese, nickel, titanium, iron, and one Ua, - The coating compound consists of the calcium silicon type. Claim: X's characteristic feature of this electrode is that the core wire contains molybdenum with the measure i- Covered electrode for arc welding 5 would give it in percent by weight from uw ^ oisι u, us, "of various types of steel, preferably carbon, 0.2 to 0.5% silicon,: 5 to 10 / _? Manganese, repair welding of casting defects in heat- 6.0 to 7.5% molybdenum, 5d, 0 to W ₁ U /, nicku, u ,, resistant cast steels, consisting of one to 0.9% titanium, the rest iron ordered. Core wire, the carbon, silicon, manganese, the application of the invention chromium - Contains nickel, titanium and iron, and an umio-free electrode with 6.0 to 7.5 _{/ o} molybdenum in the Ren =, coating mass of the calcium fluoride type, thus making it possible to weld a weld metal, characterized by that of the core-active carbide-forming elements less alloy no. Wire from 0.04 to 0.08% carbon, 0.2 to 0.5% The presence of 55 to 6% nickel in the white, silicon, 5.0 to 10% manganese, 6.0 to 7.5% Prevents the formation of brittle transition metal: molybdenum, 55.0 to 65.0% nickel, 0.25 to 0.9% 15 cationic intermediate layers in the melting zone where titanium, remainder iron, consists. Welding different types of steel and Gewai achieves high operating parameters when thinning mu Grumlmetall. At the same time, reducing u-20 Amount of carbide-forming elements in your weldment the formation of diffusion intermediate layers of d> Side of the weld metal to a minimum red adorns its malleability and improves the tilt the weld seams to age during operation. 35 elevated temperatures decreased. The use of the electrode according to the invention significantly lowers the level of alloying of the weld. good, which lowers the cost. Di. electrode is made according to usual technological pr <> 30 processes made. For a better understanding of the The invention relates to electrodes according to the prior invention, examples are given below Arc welding of various types of steel, in particular for compositions of core wires on nickel for repair welding of GuG- basis, defects in heat-resistant cast steels without er- · · 1 1 heating and without subsequent heat treatment. 35 B e i s ρ 1 e 1 1