Device for surfacing of worn parts

 

The invention relates to welding and can be used for restoration and repair of worn parts. The device consists of a recumbent electrode with a bent shank, mounted in the electrode holder, and a consumable part to be installed with a gap on bead surface. Recumbent electrode formed of connected n parallel rods hardfacing wire. Melting of the electrode covered with tightness split rings, made of metal with a melting temperature below the melting temperature of rods, and split rings are made of insulating material with a low resistance. The thickness of the split rings is equal to the gap between the electrode and fused surface. Rods consumable parts electrode can be formed into groups that are located at intervals between the excess of the maximum amount of flux pellets. At least one of the rods consumable parts electrode made of hardfacing wire with alloying elements. This embodiment allows you to expand capabilities, improve quality welding performance while reducing the cost of welding. 2 C.p. f-crystals, 7 Il.

There is a method of welding in which lie electrode and poured it on metal powder are in the details between the layers of the flux. One end of the electrode connected to the conductors, and the other is shorted to clean the item via metal powder (see and.with. SU 739818, 1978). In the method solved the question of the relationship of the mass of powder, the weight of the electrode and current for welding.

However, the method does not provide a selection of clearance required for surfacing the values between the electrode and fused surface, which leads to unstable arc and low quality surfacing, and increases the preparation time of deposition associated with the alignment of the pre-filled flux.

The closest technical solution is (see and.with. EN 2179913, B 23 K 9/04, 27.02.02 g) a device for welding of worn parts, containing recumbent electrode made in the form of consumable parts with curved shank, mounted in the electrode holder and the consumable part is installed with a gap on bead surface, connected to the conductors and is closed through the contact detail for the excitation of the electric arc and welding.

However, in this device, as described in the above analogy, used plasticase, width which matches the width of the fused surface, and their subsequent straightening and cleaning. It is difficult, leading to higher costs and limits the possibilities and application of the device in the surfacing industry.

In addition, in the device, the gap between the electrode and fused surface set using bonded with the electrode holder complicated mechanical device, comprising a Cam that does not provide sufficient precision placement of the electrode, leading to a lower quality welding and unreliable in operation.

In this device, like the above analogy, the contact and the circuit electrode with the workpiece during welding does powder filler material, which leads to the necessity of clearing surfaced portion of the flux and the Sands of powder under the electrodes. This increases the preparation time and reduces the performance of the device.

The objective of the proposed technical solution is to extend the operational capabilities to increase the performance of your device, improve the quality of welding while simplifying, improving performance and reducing the cost of surfacing works.

To solve the problem in supply the parts with curved shank, fixed in the electrode holder and the consumable part is installed with a gap on bead surface, connected to the conductors and is closed through the contact detail for initiating an electric arc welding, according to the invention, the electrode formed of the n parallel rods hardfacing wire, held together mainly by welding with obtaining consumable parts in the form of a plate of given width, and the gap between the electrode and fused surface is formed covering with tension rods consumable parts with split rings, made of metal with a melting temperature below the melting temperature of rods, and split rings are made of insulating material with a low resistance, and the thickness of the split rings is equal to the gap.

In addition, the solution of these tasks can be achieved, according to the invention, due to the fact that the clamping plate consumable parts electrode are formed into groups, which are located on the clean surface with gaps between them in excess of the maximum granule size of flux.

In addition, the solution of these tasks can be achieved, according to the invention due to t the respective elements.

The technical result of the proposed solutions is to simplify the manufacture of a recumbent electrode receiving a consumable part of any technologically given width while increasing the accuracy and reducing the time of installation of the electrode on bead surface, in improving the quality of welding, to increase productivity and reduce the cost of welding.

In Fig.1 shows the layout surfaced on the surface of the electrode, which is made of n bars (side view).

In Fig. 2 shows the design layout on bead surface electrode made of n bars (top view).

In Fig.3 shows a view along arrow A.

In Fig. 4 shows the location on bead surface electrode made of rods formed into groups (top view).

In Fig.5 shows a section along b-B of the electrode from bars, rods, formed into groups.

In Fig. 6 and 7 shows the location before applying surfaced on the surface of submerged electrodes, made respectively of the bars and of groups of bars (end view).

Plate lying electrode 1 is made in the form of a consumable part 11with bent shank 12. The electrode 1 form is ersatile 3. The rods 2 of the electrode 1 are connected mainly by welding 4 obtaining consumable part 11in the form of a plate technologically predetermined width "a". The rods 2 are covered with tightness split metal rings 5, which are made from metal with a melting temperature below the melting temperature of the twigs, and covered with tightness split ring 6 made of insulating material with a low resistance. Split metal ring 5 and split rings 6 are used to form the gap 7 and have a thickness "b" is equal to the gap. At least one of the rods 21made of hardfacing wire with alloying elements. The rods 2 plates consumable parts can be combined in groups of 9, which are located at intervals of 10 between them.

Consumable part is connected to the conductors 11. The perform welding under flux 12.

The device operates as follows.

The electrode 1 for welding is formed of n parallel rods 2 hardfacing wire bonded mainly by welding 4 (or rods may be, for example, bonded by soldering) to obtain the consumable part 11in the form of a plate. The width "a" of the plate depends on what I ease the formation of any desired electrode for surfacing width and expansion of technological capabilities in an obvious decrease in the cost of manufacture of the electrode.

The rods 2 consumable part 11covered with tightness split metal rings 5, which are made from metal with a melting temperature below the melting temperature of the twigs, and covered with split rings 6, which are made of insulating material with a low resistance. Split rings 5 and 6 have a thickness "b" equal to cladding gap 7.

Before welding the shank 12electrode 1 is fixed to the electrode holder 3, and its consumable part 11set with a gap 7 on the surface of the overlaid component 8. When this gap 7 is guaranteed to set a split metal rings 5 and split rings 6. This is achieved by improving the accuracy of placement of the electrode relative to the clean surface, the stability of the process of melting of the electrode and improving the quality of welding while improving performance and reducing the cost of the surfacing.

The rods 2 plates consumable part 11the electrode can be formed in group 9, which are located on the surface of the overlaid component 8 with gaps 10 between them. This allows us to improve heating distribution surfaced on the surface, to improve the rate about the us 12 to the clean surface may be filed, including through the gaps 10 between groups 9 bars 2, which exceeds the maximum granule size of the flux. This allows you to increase the uniformity of the flux and to simplify the presentation, as well as to reduce the preparation time and improve the quality of welding.

Then clean the surface of the rods consumable parts from the flux and fill them with powder filler material doped, and then covered with flux. At least one of the rods 21consumable parts electrode may be made of hardfacing wire with alloying elements, which improves the quality of welding.

When turning on the power source (not shown) of the welding current from the conductors 11 is supplied to the electrode 1 and through embracing the rods 2 consumable part 11metal split ring 5 - surfaced parts 8. As a result of this arc excites and is surfacing. This allows to simplify the device and reduce the cost. The execution of the split ring 5 made of metal, the melting temperature less than the melting temperature of rods provides easy excitation of the arc at low welding currents, which gives the opportunity to reduce energy costs.

the th for surfacing width, in enhanced operational capabilities in improving the quality of welding while improving performance and reducing the cost of the surfacing.

Claims

1. Device for submerged arc welding of worn parts, consisting of a recumbent electrode with a bent shank, mounted in the electrode holder, and a consumable part to be installed with a gap on bead surface, connected to the busbar, wherein the recumbent electrode formed of connected n parallel rods hardfacing wire, with the receipt of consumable parts in the form of a plate of given width, consumable part covered with tightness split rings, made of metal with a melting temperature below the melting temperature of rods, and split rings are made of insulating material with a low resistance, the thickness of the split rings is equal to the gap between the electrode and fused surface.

2. Device under item 1, characterized in that the rods consumable parts electrode are formed into groups that are located at intervals between the excess of the maximum amount of flux pellets.

3. Straisteanu wire with alloying elements.

 

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FIELD: processes for surfacing with use of lying electrode, possibly restoration of worn surfaces of parts in different industry branches.

SUBSTANCE: method for surfacing bead of rollers of road building machines comprises steps of arranging roller in such a way that its axis is vertical; dividing surfaced zone of bead by technological sectors; forming electrodes of n mutually joined rods bent along arcs of sectors and arranging them on surfaced area of respective sector with gap; supplying flux and additive powder material to surfaced zone; connecting electrode and part with power source for exciting electric arc and performing surfacing; placing electrodes on sectors of bead simultaneously along the whole circle; electrically connecting front end of one electrode with bead; at surfacing narrow beads, forming electrodes of n mutually joined rods arranged one over another.

EFFECT: enlarged manufacturing possibilities of method for surfacing parts with annular worn surface, lowered cost, enhanced efficiency of process.

3 cl, 5 dwg, 1 ex

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