KR920010493B1 - Build-up welding method for wear resistant metal - Google Patents

Abstract

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Description

Growth welding method of wear-resistant metal

1 is a longitudinal sectional front view of an essential part of a device used in the practice of the present invention;

2 is an isometric view.

Figure 3 is an enlarged cross-sectional view of the growth portion according to the present invention.

4 is a side view showing the relationship between the spread width and the swing width of the alloy powder.

Fig. 5 is a side view showing the wear resistant liner.

* Explanation of symbols for the main parts of the drawings

2: alloy powder 4: base steel sheet

9: electrode l: spread width

L: swing width

The present invention mainly builds up a wear-resistant metal on a steel sheet that is a base material during the production of a weldable wear-resistant liner attached to a part requiring wear resistance in an industrial machine, a mining machine, a construction machine, or the like. It is about how to.

Conventionally, as a method of performing a growth welding of abrasion resistant metal on a steel sheet, an arc welding method using a welding rod or a composite wire mainly adjusted to a predetermined growth metallic portion, and a flux in which a wire electrode and a metal component are added are combined. Submerged arc welding methods are widely used.

However, when producing a wear-resistant liner having a thin plate thickness of the base steel sheet and having a thick flesh thickness of the growth metal, it is necessary to increase the electrical energy to be input in consideration of the thickness of the growth metal. The penetration of the growth metal into the furnace is large, so that the desired growth metal component is not obtained and the deformation of the base metal is also large.

Moreover, although the method by a multilayer growth can also be considered, since a wear-resistant metal is bad in weldability, a problem arises that a crack generate | occur | produces and a bead becomes disturbed.

Therefore, as disclosed in Japanese Unexamined Patent Application Publication No. 38-26267, a method has been proposed in which arc is blown from the electrode near the top of the deposited alloy powder, whereby the dilution ratio is as small as possible. In particular, among the wear-resistant metals, chromium carbide, which is a hardening element, is used as an effective means for precipitation.

However, when this method is used for the production of wear-resistant liners, since arc is low current due to the large amount of alloy powder to be supplied, poor welding occurs in the weld zone, and slag is rolled in or weld beads are formed. There is a problem that a surface uneven state occurs.

In this conventional method, since the welding speed is in the range of 15-50 cm / min, the alloy powder melts even when arc is generated at the top of the alloy powder layer. There is a problem that only a metal is formed and does not melt with the base steel sheet, and this tendency is further strengthened by using a weak current.

On the contrary, it is conceivable to use a strong current. However, if arcing force is generated on the surface of the base steel sheet while removing the alloy powder by the arc force, the dilution rate to the base steel sheet increases, and the base metal melts. There is also concern.

The present invention was developed in order to solve such a problem, and its object is to produce a growth metal of a desired component at an appropriate dilution rate that does not cause deformation in the base material even when used in the production of a wear-resistant liner. The present invention provides a method for growing and welding wear-resistant metals which can be obtained and can stabilize the growth of metals having wear resistance by adjusting the oscillating width of the electrode.

In order to solve the above problems, the present invention is to spread the alloy powder on the base steel sheet, the following method, the electrode in the direction perpendicular to the welding progress direction by the submerged arc welding from above the alloy powder layer In the growth welding method for wear-resistant metals, wherein the wear-resistant metals are welded while shaking, the spreading width of the alloy powder is not made at least 30 mm smaller than the swing width, and the welding progress speed is maintained within the range of 3-10 cm / min. The growth welding method of wear-resistant metal, which is characterized in that the growth welding is adopted.

According to the configuration of the present invention, the width of the dispersed alloy powder due to the arc force of the electrode is not extremely reduced, and variation in the ratio between the electrode and the alloy powder at both ends of the swing can be prevented. .

In addition, the arc can be stably generated on the molten paper, and the base material can be melted shallowly by the heat energy of the heated molten paper, so that the dilution rate can be suppressed to be small.

EMBODIMENT OF THE INVENTION Hereinafter, it demonstrates in detail based on the Example which showed this invention. 1 and 2 show the apparatus used in the practice of the present invention. In the drawing, reference numeral 1 denotes a hopper for supplying the alloy powder 2, and the base steel sheet from the spray hole 3 is shown. (4) To spread and grow alloy powder (2).

Reference numeral 5 denotes a hopper for supplying the welding flux 6, which is intended to be dispersed and grown on the alloy powder 2 layer from the spreading holes 7.

Reference numeral 8 denotes a device for supplying a wire electrode 9, and reference numeral 10 denotes a device for oscillating the wire electrode 9 protruding from the electrode supply device 8 in a direction perpendicular to the welding progress direction indicated by an arrow. to be.

Then, the apparatus is moved in the welding direction, the wire electrode 9 is oscillated, the alloy powder 2 is melted in the flux 6, and the upper surface of the base steel sheet 4 is slightly moved. In the drawing, reference numeral 11 denotes a solidified weld-hardened metal, reference numeral 12 denotes slag, reference numeral 13 arc, and reference numeral 14 in the drawing. Denotes a molten pool, reference numeral 15 denotes a guide, and reference numerals 16 and 17 denote open / close valves of the hoppers 1 and 5, respectively.

4 shows the relationship between the spreading width 1 of the alloy powder 2 and the swinging width L of the wire electrode 9.

If the spread width l is 30 mm or more narrower than the swing width L, a good and uniform wear resistant metal cannot be obtained.

That is, the weld metal obtained by this construction method consists of synthesis | combination of the wire electrode of a general mild steel component, and a high alloy powder, and the powder body spread | dispersed by the arc force of the rocking wire electrode expands in width.

However, when the spreading width l becomes 30 mm or more narrower than the swinging width L, the enlargement of the powder due to the arc force described above is significantly reduced, and the ratio between the wire electrode and the powder at both ends of the swinging Because of this drastic change, the weld metal that satisfies the wear resistance cannot be obtained.

However, this invention limits the minimum width of the alloy powder 2 dispersion | distribution, It does not specifically limit about the maximum width, For example, it may be the same width as a rocking width.

Next, the welding speed will be described.

While the conventional welding speed is 15-50 cm / min, in the present invention, a good wear resistant weld metal can be obtained by setting it to 3 cm / min or more and 10 cm / min or less.

That is, by limiting the speed, as shown in FIG. 3, the arc 13 can be stably generated on the molten pool 14, and as a result, the base metal is shallowly melted by the thermal energy of the molten pond that has been overheated. As a result, the dilution rate can be suppressed to be small, and the alloy powder 2 is also melted by the other molten paper 14 of the arc 13 to secure the growth welding metal of the desired component.

In addition, when the welding speed is 3 cm / min or less, the leading edge of the molten pool 14 becomes large, arcing is interrupted, and welding becomes unstable, and the heating mechanism of the base material 4 is disturbed. If the base material 4 is not melted or large slag is curled, it is impossible to obtain a normal weld metal.

On the contrary, at 10 cm / min or more, there is no precedence of the molten paper 14, and the arc 13 is generated directly in the retaining material 4, which is stable against arc generation and deposition metal formation, but the dilution rate is excessive. As a result, it is impossible to secure a useful component of the wear-resistant metal.

Table 1 below shows the components of the wire component and the alloy powder and the components of the growth welding metal (synthetic component of the wire and the alloy powder) as one embodiment of the present invention, and Table 2 shows the wear resistant growth metal layer having the above-mentioned composition as a main component. It shows the manufacturing conditions of the wear-resistant liner having a.

However, the dimension of the liner was 100 mm in width, and the thickness of the wear-resistant raised metal layer was 6 mm, and SS41 made the thickness of the base steel plate 9 mm, and made the whole thickness 15 mm with respect to thickness.

TABLE 1

TABLE 2

In addition, the present invention can be applied not only to the production of wear-resistant liners, but also to various types of alloys other than the wear-resistant metals for growth welding while suppressing the dilution rate.

According to the present invention, since the spreading width of the alloy powder is not narrower than 30 mm more than the swinging width as described above, the spreading of the scattered alloy powder due to the arc force of the electrode is not extremely reduced. As a result, the ratio change between the electrode and the alloy powder at both ends of the fluctuation can be prevented, and a weld metal having wear resistance can be stably obtained.

In addition, since the melt progress rate is maintained in the range of 3-10 cm / min, arc can be safely generated from the top of the molten pool. Therefore, the base material can be melted shallowly by the thermal energy of the overheated molten pool, so that the dilution rate is reduced. In addition, the alloy powder can be actively melted by a molten paper in addition to arc, and as a result, the base metal can be melted shallowly, and a growth welding metal of a desired component can be obtained.

Claims (1)

The alloy powder 2 is dispersed on the base steel sheet 4, and the wear-resistant metal is dispersed while the electrode 9 is swung in the direction perpendicular to the welding progress direction by submerged arc welding from above the alloy powder 2 layer. In the growth welding method of wear-resistant metal to be welded, the spreading width l of the alloy powder 2 is not made narrower by 30 mm or more than the swing width L, and the welding progress speed is in the range of 3-10 cm / min. The growth welding method of the wear-resistant metal, characterized in that to maintain the inner welding.

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