WO1998026896A1

WO1998026896A1 - Process of electric contact hardfacing

Info

Publication number: WO1998026896A1
Application number: PCT/RU1997/000406
Authority: WO
Inventors: Sergei Jurievich Petrov; Vladimir Anatolievich Dubrovsky; Jury Nikolaevich Axenov; Vsevolod Valerievich Bulychev
Original assignee: Sergei Jurievich Petrov; Dubrovsky Vladimir Anatolievic; Jury Nikolaevich Axenov; Vsevolod Valerievich Bulychev
Priority date: 1996-12-16
Filing date: 1997-12-16
Publication date: 1998-06-25
Also published as: RU2104845C1; AU5501198A

Abstract

The invention relates to a process of electric contact hardfacing intended for use in various branches of the machine-tooling industry to hard-face or reinforce machine parts. The process consists in distorting the filler rod and the surface layer of the metal, while a modulated welding current is fed through the section to be welded. In order to prevent temperature build-up in the welding area at high heating rates, a cooling medium such as water is supplied. This technique enables items to be manufactured free of cracks, even in the case of metals such as iron and high-tensile steel which could not previously be hard-faced by processes of this type.

Description

\ УΟ 98/26896 ΡСΤ7ΙШ97 / 00406

The method of electronic float.

Area of technology

The invention relates to the field of welding, in particular to electrical equipment.

Locally accessible and hard-to-find names and find the right place for restoration

personal items made of cast iron and alloy steels, as well as other items

τalei.

PREVIOUS LEVEL OF TECHNOLOGY

The method of electronic contact is known, as is the case with conventional

Foreign and non-traditional metal parts of the product are single defective

Take care of the electric appliance and heat it up by

two-sided current (see Yu.Β. менlimenko "Electric contact"

Μ.: Metallurgia, 1978.- S.50, 54-55.).

However, for such a method of surfacing in conditions of rapid cooling of the Aus-

the tenit is growing in profitability, and the last one has the largest

specific volume than other structures in the metal, this is the result of the process

the name of the voltage stress, and, in some cases, the recognition of the stress

Chin (see Μ.Ε. Blanter. Metalworking and thermal processing. -

Μ.: Kashgiz, 1963 .-- 416 s).

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The quenching of Ρе-С alloys is carried out at a temperature of 20-50 ° С

(see Fig. 1) above the line of critical temperature С-З-Κ (Αс ₃ - for do-

steel, Αс ^ - for euthectoid and over-steel), when

there is homogeneous austenitis (), with the subsequent cooling down with a speed -

ω _οχл , πρ increasing kritical.

However, on the other hand, on the formation of the metal structure, there is a substantial

influence is also indicated by other parameters of the thermal cycle, such as:

The heating rate is ω _n and the discharge time is higher than the critical temperature - Ι _century .

To analyze the influence of these parameters on the structure with the help of

Diagrams of isothermal transfer of the disease (P) to Α,

in the temperature range. For example, for euthectoid steel, C = 0.8

The optimal heating temperature for the formation of austenite Τ = 740 ° С. Pos-

le heating to the indicated temperature, the conversion of P to Α begins after

10 seconds (see point 1 in figure 2). Β interval 10 + 100 s (between points 1 and 2)

The transformation of П into Α occurs. At the end of the revolution (point 2), the structure of the community

It consists of Α and undeveloped cement particles (C). Disorder of C is observed

is given for further support up to 640 s (between points 2 and 3) when

often irregular Α with unequal separation of carbon. Home

lowering (diffuse alignment of the composition) occurs in the interval

40 ÷ 3200 s (between points 3 and 4). After what is the next homo-

gene austenitis. Step 1 lies on the line Η - the beginning of π-rotations P → Α; point

2 lie on the line Κ - the separation of the areas of the end of transformations П → Α and the beginning

cement disintegration; Point 3 lies on the line Ρ - completion of the solution

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Ts; Point 4 lies on line Г - where homogenization ends. Increase

the speed of heating ω _n (shown in Fig. 2 by the lines Ι-ω _n1 , ΙΙ-ω _n , ΙΙΙ-ω _n3 ,

πρichem _n ω ι <ω _n <ω _H3) πρivοdiτ κ ποvysheniyu τemπeρaτuρy πρevρascheniya P → Α,

τ.e κ to the transfer of the C-8-Κ line to the east in the area of elevated

ρatuρ. Since at heating of the eutheroid steel, a speed of ω _n = 242 ° C / s π

the rotation of P → Α begins at 800 ° C after 0.3 s (point 1 ') and ends

after 1, 2 s (point 2 '), and the homogenization ends after 5 s (point 4') [see

Μ.Ε. Blunter. Metallurgy and Thermal Processing. - Μ.: Shastiz, 1963.

S.162-164].

For surfacing, structural and phase changes in the zone of thermal

influences depend on the parameters of the thermal cycle. Β together with if

Tall is located above the temperature above S-W-Κ, that is, at the cooling stage,

at speeds above the critical, transverse structures and short-circuiting are used

the prevalence of occurrences of cold and hot traffic, especially in

coal, alloyed steels and cast iron.

DISCLOSURE OF INVENTION.

The objective of this invention is to increase the quality of shipments for

account for the exclusion of waste.

For this, in the form of an electronic contact float, for example,

subdivision and foreign layer of metal of the product

Use the power and heat the appliance and heat it up.

Modules are supplied, in the area of the floats they supply a cooling medium for

Ensuring a high speed of heating with a minimum of heat and

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Disposal of constructions and phrases of disruptions and as a consequence, treatment

the title of the transcendental structure, by excluding the direction of stay

metal πρ and temperature above the Ο-З-линии line on the Ρ-С diagram.

Quick description of the drawing.

Figure 1. The diagram of the state of the S-C and the interval of the optimal temperature

heating to produce austenit.

Φig. 2. Diagram of isothermal transfer control in austenit

eutectoid steel from 0.80%.

The essence of the method is as follows.

For the purpose of acquiring education, the transcendental structures are proposed

USE THE PHYSICAL PROPERTIES OF METALS ASSOCIATED WITH THE PRINCIPAL FEATURES

the process of πρrevolution P → Α (see φig. 2). In general, for the reception of

connection of the fused metal with the primary metal is indispensable with

One side, heating the metal to a high temperature, higher unbiased

new line S-W-Κ, which will ensure the activation of disturbances, strengthening of processes

With diffusion and an increase in the flatness of the metal, and on the other hand, it is not necessary

We should not allow the development of austenitism, i.e. Download should be lower.

offset line S-W-Κ. Practically, this can be realized at the expense of

Larger values of kak ω _n tak and ω _ohl .

The indicated parameters of the thermal cycle, and the name of the larger speed

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heating-ω _n and the maximum temperature of the local heating of the metal

Near the superimposed frequency, it can be received by electrical and electronic devices.

Impact-controlled surfacing using pulse-type modulators

τοκа. However, in the process, floats in the product are gradually accumulating heat

and it is heated. This is true because it rotates the thermal cycle for

point on the part of the world where the idea of the process of forming a connection is absent

is shifted in height and increases the time of the metal is higher than

garlic temperatures! _at > 0, and ω _οχл decreases. NOT TO BE ACCESSIBLE

heat in the details, but in the end of the development of the transcendental structure

(Particularly iron and steel welded and cast iron), it is proposed to

You must have a greater than normal cooling rate in the surfacing process by doing so.

Refrigerant cottages are not available in the connection zone - on

Flavors. In general, the melted metal will heat up intensively

between the drive and the part for high temperature, and at the pause

between pulses it is to be cooled down intensively.

BEST MODE FOR CARRYING OUT THE INVENTION.

We made a cylinder surfacing with a diameter of 60 mm from the SCh 24 metal.

Ηaπlavκu οsuschesτvlyali the next _{communication} ρezhime ν = 3 οb / min, τοκ imπulsa

'im ^ uκΑ. The duration of the pulse is 1 _I = 0.08 s, the duration is

πauzy κa 1 and _P h ^~ _^> ^^ ^c _{"naπρyazhenie} _{communication} υ = 4-5 Β, προvοlοκa πρuzhinnaya 2nd κlassa πο GΟSΤ9389.60, diameτροm ό = 1, 6 mm, pressure ροliκοvοgο eleκτροda 150

kg / mm ² , temperature of the cooling medium - water 10-20 ° С. After

The melts received the product with the primary fused layer СПС = 54-56.

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Intended use.

This method may be used in an automobile, on

healthier risk (for example, in case of irradiation and deterioration)

steady-state cartridges, distribution and other shafts and bodies

rotation).

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Claims

νθ 98/26896 ΡСΤ / ΙШ97 / 00406

Formula of the invention

The method of electronic contact floatation is just the same as for conventional

to and the outer layer of the metal of the product is simultaneously deferred

Place the electric appliance on and heat it up by loading the module

bathtub, which is characterized by the fact that in the area of surfacing it is supplied with cooling

Medium, ensuring minimal energy consumption and high speed on

heating and consuming structural and phase changes, and as a result

The development of the transcendental structure by excluding the stay is directed to

metal and temperature above the offset line of the north-west on the diagram

He-S.

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