SU1222463A1 - Method of continuous manufacture of multilayer articles by welding - Google Patents

Description

2. The method according to claim 1, characterized in that the dimensions and the number of protrusions on the workpiece of a more refractory metal is chosen.

B - m l - b - l

h:

To / TPL.CL., CLAILTER

 t :: g 1s ,, l, p

m and f are numerical factors, 5; 3,

R - coefficient taking into account the thermophysical properties of metals

C - heat capacity of low-melting point, respectively.

The invention relates to the field of high-frequency welding and can be used in the manufacture of various products, in particular bimetallic contact wires.

The aim of the invention is to expand the technological capabilities and improve the quality of the product when it is manufactured from metals with different thermal properties.

FIG. 1-5, cross-sections of longitudinally continuous workpieces are shown before they are welded (the protrusions are made in the longitudinal direction along the entire length of the billet of more refractory metal on its welded surface and may be of different, the same and even uneven shape on the same welded surfaces), in FIG. 6 tons weld.

The essence of the proposed method of producing laminated rolled products is that the joined surfaces of the workpieces are heated to melting by high-frequency currents, after which they are jointly plastic deformed, and a protrusion is created on the welded surface of the more refractory metal

y, t

and | ll pl-t

Bh b - h And refractory metals;

the proportion of low-melting and refractory metals

electrical resistivity of low-melting and refractory metals; melting point of low-melting and refractory metals; width of fusible billet; the height of the protrusion; shoulder width; Number of protrusions The depth of penetration of welding current into low-melting and refractory metals.

and they are not melted before the point of convergence, but joint deformation of the products is produced by the amount necessary for

close the hollows between the ridges.

The greatest intensity of the welding process can be ensured if the size and number of protrusions on the refractory metal is chosen from

ratios

,,

.one

PA

h b.

where h and b are respectively the height and width of the protrusionJ

- the number of stunts;

- width of fusible billet;

1-g and c are numerical coefficients g., 5 {37-. e. 2J;

to

.u / b.r /

K - coefficient taking into account the thermophysical properties of the metal blanks;

.

n and .. RLIAT

Ldil

.g

- heat capacity of low-melting and refractory metals, respectively

-specific weight of low-melting and refractory metals;

- specific electrical resistance of low-melting and refractory metals;

- depth of penetration of welding current into low-melting and refractory metals,

- low-melting point melting temperature

and refractory metals.

The creation of protrusions on the surface of the refractory product leads to a decrease in the active cross section of this conductor and to a decrease (at that e frequency of the welding current) of the volume of the heated metal. This allows for heating to melt both welded products regardless of the ratio of their melting temperatures. As a result, the proposed method can be extended to cases where the process is carried out, when the melting point of the welded blanks is two or more times different. The deformation of the magnitude at which the depressions between the protrusions are closed provides for the wetting of the entire surface to be welded with a refractory metal and a high-quality welding process.

The choice of geometrical dimensions / protrusions in accordance with the above extrusions ensures the most efficient and uniform heating. The ratios also take into account the technological possibilities of making such protrusions. The number of protrusions is associated with the thermal properties of materials and is derived from the heat content of products heated by an equal welding current.

Said protrusions may be made, for example, by pre-rolling. In the rolling process, the cross-section of products can be deformed in such a way as to obtain the shape of the product, which is close to the service one. This solution eliminates the technical difficulties associated with

2224634

rolling a product having various mechanical properties along the weld line.

The proposed method, in comparison with the known ones, provides for the creation of new types and sizes of bimetallic products and semi-finished products due to the use of the advantages of high-frequency heating technology for areas where these products have not yet been used and where the introduction of bimetallic products is of great national importance.

J5 In addition, equipment becomes simpler and cheaper, production space is reduced.

The proposed method allows to significantly expand the technological capabilities of the process, and its use allows producing bimetallic products of complex configuration, for example, contact wires, various guides, and bars of complex shape.

In addition, the exact choice of technological parameters ensures high quality products.

Example. An experimental verification of the possibility of making a multilayer product was carried out on a laboratory model with high-frequency welding of various shapes of iron, copper, zirconium bronze and aluminum. In particular, the possibility of obtaining a trimetallic contact wire containing an iron core, a copper coating and a bronze part at the point of contact with a moving vehicle (current collector) is determined.

The dimensions and the number of protrusions on the refractory metal, determined by the specified ratios, ensure the high quality of the product and the intensity of the high-frequency welding process. When the dimensions deviate, the intensity of the process decreases, the quality deteriorates, and nonproductive power losses increase. 50 The experiments were carried out on a device containing a power source (a VPN generator - 630 / 0.44), a conductive conductor, a welding and forming device, draw stands, and 55 a receiving device.

Experimental work is carried out under the following modes of high-frequency welding: V 10-11 kV, 1 45-60 A and

thirty

35

45

L

  8,1-12, FOR, the width of the blanks 5-15 mm, thickness of 3-10 mm.

Previously, on the surface of a more refractory billet of aluminum strasplav or bronze,

the roller obtained protrusions with a height of 0.3-2.5 mm and a width of 0.15-2 mm.

For example, high-frequency welding of strip blanks having a width of 7 mm, a thickness of 10 mm, and low-carbon steel is carried out. Art. 10 and aluminum alloy AMC. On the welded surface of the steel billet, pre-rolling made two protrusions with a height of 2 mm and a width of 1.5 MM, which corresponds to the formula of the invention, according to which

L 2.5 A. 2.5-0.08-10 2 mm, b 1.5 mm.

P ,,. 9 gmi-,

Bt | T „,

j

TO

Sl-Thl yl Rt

-; 0.6

. The high frequency current is supplied from the source of the type of VPN 630 / 0.4A by contact method. The speed of welding is 10 ki 35 M / min. Power supply mode UJO kV, 1.52 A, 1 10 A.

As a result, a well-welded joint of dissimilar materials was obtained. The analysis of microscopes and the appearance of burrs shows that the surface of the steel billet in the weld center is covered with a liquid phase formed when the projections melt, which determines the quality of the welded joint.

(Reg. 2

Fi.Z

FIG 4

CSoDHoi /

and / about

Ar

FIG. five

Editor L.Gratillo

Compiled by E. Vetrova Tehred L. Oleinik

Order 1649/13

Circulation 1001 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

FIG. 6

Proofreader, E. Sirohmai

Claims (2)

1. METHOD FOR CONTINUOUS MANUFACTURE OF MULTILAYERED PRODUCTS. 'WELDING, in which the welded surfaces of the workpieces are heated until melted by high-frequency currents and produce their joint plastic deformation, which is different. the fact that, in order to expand technological capabilities and improve the quality of the product when manufacturing it from metals with various thermophysical properties, protrusions are created on the surface of the workpiece to be welded from a more refractory metal and melted, and joint plastic deformation of the workpieces is carried out by an amount that ensures the closure of cavities between the protrusions. La FIG. 1 2. The method πό π. 1, characterized in that the size and number of protrusions on the workpiece of a more refractory metal is selected. From the relations B - w Δ _t - b - E L _t > and refractory> 'about metals; and - the proportion legkoplav ^t someone and refractory metals; and p - Specific elektrosopro ^t tance fusible and refractory metals; where m and f are numerical coefficients me [l, 5; 3], fe [1, 2] J; R is the coefficient taking into account the thermophysical properties of the metal blanks; Cu - heat capacity, respectively, fusible T and I the melting temperature ΠΛ.Λ pl-t fusible and refractory metals; the width of the fusible workpiece; h - protrusion height; b - protrusion width; s - number of protrusions; penetration depth welding current in low-melting and refractory metals.