JPH0976090A - Welding material for repair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a welding current to be uniformly distributed and passed inside a welding material for repair and to carry out consistent welding. SOLUTION: Press forming is performed so that a plurality of a wire member 2 the diameter of which is made smaller than the size to be corrected may form a prescribed packing ratio, welding is also carried out in between the wire members by means of a sintering means, and a welding material for repair is thereby formed in a plane shape; consequently, the internal structure of this welding material 1 for repair is formed into three dimensional meshes provided with innumerable junctions, by making the wire member 2 planar with the prescribed packing ratio.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an outer surface of a metal member,
For example, when minute dimensional correction is required, such as when the die is worn, or when scratches or abrasions are generated due to careless handling etc., welding is performed on the repaired part by resistance welding etc. It relates to a welding material called.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show the conventional state of this type of dimensional correction. For example, the outer surface of a mold 10 is repaired in a concave shape in a narrow area due to dents, scratches, or the like. When the portion 11 is produced, as shown in FIG. 4, the repaired portion 11 is filled with a powdery welding material 90 which is a powdery metal having a relatively high electric resistance such as an iron-chromium alloy,
An electric current is applied to the powdery welding material 90 by welding while pressing it with the welding electrode 15 to weld the powdery welding material 90, and the repairing portion 11 is filled in for repairing.

A wide range of repair parts 1 due to wear etc.
When 2 occurs, as shown in FIG. 5, a thin plate-like welding material 91 having a plate thickness of 0.1 to 0.2 mm, such as the iron-chromium alloy, is applied to the repair portion 12, and the welding electrode 15 is applied.
A current is applied to the thin plate-shaped welding material 91 by welding while pressing it to correct the repair portion 12.

[0004]

However, in the above-mentioned conventional one, first, the powdery welding material 90 is made into a powder form, so that pressure is applied to the welding electrode 15 to perform pressure contact with the die 10. At this time, the pressure easily causes the welding electrode 15 to remove the powdery welding material 90 and dive into the welding electrode 15, which causes a variation in the amount of the powdery welding material 90 sandwiched between the mold 10 and the welding electrode 15. .

On the other hand, the amount of welding current flowing through the welding electrode 15 is usually set to a constant value. Therefore, when the powdered welding material 90 is small, the powdered welding material 90 is excessively melted. As a result, it becomes liquid and scatters to lower the adhesion efficiency, and in order to adhere a necessary amount, it is necessary to repeat filling and welding of the powdery welding material 90 many times, resulting in a decrease in work efficiency.

Further, when an excessive amount of the powdery welding material 90 is sandwiched, the powdery welding material 90 is not sufficiently melted and a cavity (void) is formed in the formed nugget. , It cannot be said that the intended repair has been completed. Moreover, both the shortage and the excess of the welding material 90 may occur when, for example, a scratch or the like is filled, and as a result, the work efficiency of the conventional one is poor, and at the same time, the quality at the time of repairing is low. Is causing problems.

Further, in the thin plate-shaped welding material 91, since the thin plate-shaped welding material 91 is thin, the flatness is likely to be lost due to bending or the like during the handling, and when the thin plate-shaped welding material 91 is applied to the repair portion 12, it is partially broken. When a welding occurs, a current concentrates on a partial contact portion, the thin plate-shaped welding material 91 excessively melts and scatters at that portion, and even the die 10 melts to form a hole. May occur.

Further, naturally, no welding is performed in the non-contacted portion, which not only deteriorates the repair quality, but also necessitates new hole filling, which significantly reduces work efficiency. However, there have been some problems, and the solution of these problems has been a problem of the conventional ones.

[0009]

As a concrete means for solving the above-mentioned conventional problems, the present invention provides a welding material for repair used for welding to a metal member for dimensional correction. The welding material is pressure-molded so that a plurality of linear members each having a diameter smaller than a dimension to be dimensional-corrected have a predetermined packing rate, and a sintering means is provided between the linear members. By providing a welding material for repair, which is joined and formed in a plate shape, it is possible to improve work efficiency and quality at the time of repair and solve the problems. is there.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in detail based on an embodiment shown in the drawings. Reference numeral 1 in FIG. 1 indicates a welding material for repair (hereinafter abbreviated as welding material 1) according to the present invention, and this welding material 1 is comparatively, for example, a scratch generated on a metal member 10 which is a mold. Repair part 1 such as a very small part or a relatively wide part such as a surface
It is the same as the conventional example in that the purpose is to weld 1 to fill it and repair it.

Here, in the present invention, the welding material 1 is formed into a plate shape with a plurality of linear members 2, and the linear members 2 are, for example, iron-chromium alloys,
It is formed by using a metal member having an appropriate specific resistance value suitable for performing resistance welding, such as an iron-nickel alloy or an iron-nickel-chromium alloy (stainless steel).

At this time, it is preferable that the diameter of the linear member 2 is set to be equal to or smaller than the size at which the portion to be repaired is to be repaired, or the diameter is smaller than that. Since it is preferable, it is preferable to adopt the thinnest possible one in consideration of the cost and the technical aspect.

The cross-sectional shape and length of the linear member 2 will be described later, but unless the step of processing the linear member 2 into the plate-shaped welding material 1 causes any particular trouble. However, for example, the cross-sectional shape and length obtained by the wire manufacturing method that can obtain the linear member 2 having the intended wire diameter at present can be adopted as it is.

In order to form the welding material 1 with the above-mentioned linear member 2, first, an appropriate amount of the linear member 2 is compressed into a plate shape by an appropriate pressure means such as a press or a rolling roller. At this time, the pressure applied by the pressurizing means is adjusted so that the volume occupied by the linear member 2 in the constant volume of the welding material 1, that is, the packing rate is within a predetermined range.

FIG. 2 schematically shows the above-mentioned state, and the welding material 1 has a three-dimensional net-like shape in which a plurality of linear members 2 are in contact at contact points P at a very large number of places. Further, in the present invention, the contact point P is welded by a sintering means such as heating in addition to the pressurization, whereby the welding material 1 is not unraveled by an external force or the like, The plate-like shape formed by pressing is maintained.

Next, the operation and effect of the welding material 1 of the present invention having the above-mentioned structure will be described. First, FIG.
As shown in FIG. 3, when the overlaying is performed on the repaired portion 11 of the mold 10, the welding material 1 is overlaid on the repaired portion 11 and the welding electrode 15
A welding current is applied to the repairing portion 11 to weld the welding material 1 to the repairing portion 11.

At this time, the welding material 1 is the linear member 2
Therefore, the repair portion 11 and the welding electrode 15 come into contact with each other at a very large number of points, and the welding electrode 15 and the repair portion 11 contact each other.
Since there are a large number of contact points P even inside the welding material 1 up to, the welding current flows in a dispersed state. Therefore, the welding current is concentrated on one part,
No sparks or the like leading to the scattering of the welding material 1 or the repair portion 11 are generated at all, and an ideal welding surface is always obtained.

In addition, when the filling rate is set in the welding material 1 and a gap is included inside, it has deformability of an appropriate shape, and when the welding electrode 15 applies pressure. The surface of the welding electrode 15 and the repaired portion 11 is deformed so as to fit the welding electrode 15 and the repaired portion 11, and the adhesion between the welding electrode 15 and the repaired portion 11 and the welding material 1 is further improved. It will be more reliable.

Furthermore, the function of fitting with the repair portion 11 is also exhibited after welding is performed. For example, when slight irregularities are formed on the surface of the repair portion 11,
With the solid plate-shaped welding material of the conventional example, there is a high possibility that a gap will be created in the uneven portion, but with the welding material 1 of the present invention, welding that fits in the uneven portion is performed, and therefore the quality of repair is also improved. To do.

Since the filling rate is set for the welding material 1, for example, if the welding material 1 has a filling rate of 20%, the thickness after welding is reduced to 1/5 of that before welding. However, since this can be easily known from the wall thickness and filling rate of the welding material 1 before welding, there is no obstacle to anything, and rather, a very small amount of build-up is performed. Also in this case, the relatively thick welding material 1 can be used, and the workability is improved because the welding material 1 is not deformed during handling.

Furthermore, the welding material 1 is a thin linear member 2
Since the welding material 1 is formed as an aggregate of
For example, scissors for paper cutting, cutter knives, etc., which are used for office work, can be cut very easily, and the cutting surface can be sharp without burring.

Therefore, at the time of repairing, the welding material 1 can be easily formed into a free shape corresponding to the shape of the repairing portion 11 without preparing a special cutting tool, and the repairing work can be performed at the minimum necessary. Therefore, the workability can be improved in this respect as well.

The results of experiments conducted by the inventor of the present invention will now be described. In forming the welding material 1, the wire diameter of the linear member 2 is 1/1000.
It was confirmed that good results were obtained when the linear member 2 having a thickness of 2/100 mm was used, and good results were obtained when the packing rate was 10 to 50%.

In addition, according to the results of the above experiment, the welding material 1 of the present invention is not only suitable for repairing a relatively wide range such as the above-mentioned overlay, but is also cut into a linear shape or a pad shape by scissors. By using it, it is also suitable for repairing relatively small parts such as embedding grooves, hole-shaped recesses, build-up of corners, etc. Therefore, conventionally it was used for repairing this kind of small part It has been confirmed that a powdered welding material can be substituted.

[0025]

As described above, according to the present invention, pressure molding is performed such that a plurality of linear members each having a diameter smaller than the dimension to be dimensional-corrected have a predetermined packing rate. By using the welding material for repair formed by joining the linear members by a sintering means to form a plate shape, the linear members are formed into a plate shape with a predetermined packing rate. As a three-dimensional net having an infinite number of connection points inside the repair welding material, as a result of which the welding current is evenly distributed and flows inside the repair welding material,
It is assumed that uniform welding is always performed, and it has an extremely excellent effect in improving efficiency and quality of repair work.

Further, since the filling rate is set, the welding material for repair has appropriate deformability with respect to an external force, and becomes familiar with and closely adheres to the shape of the welding electrode or the unevenness of the repaired portion. The effect of further assuring the uniformization of the welding current is also obtained.

Further, with the above-mentioned structure, the welding material for repair of the present invention can be formed into an arbitrary shape by using, for example, scissors or a cutter knife without preparing a special cutting tool. Since the shape of the repair portion can be easily formed prior to the repair, the repair work can be performed within the minimum necessary range, and in this respect also, the work efficiency is improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a repair welding material according to the present invention.

FIG. 2 is an explanatory view schematically showing the internal structure of the repair welding material of the same embodiment.

FIG. 3 is an explanatory view showing a repairing process using the repairing welding material according to the present invention.

FIG. 4 is an explanatory diagram showing a conventional example.

FIG. 5 is an explanatory view showing another conventional example.

[Explanation of symbols]

 1 …… Repair welding material 2 …… Linear member 10 …… Mold 11 …… Repair part

Claims (2)

[Claims] 1. A repair welding material used for welding to a metal member for dimensional correction, wherein the repair welding material is composed of a plurality of linear members each having a diameter smaller than a dimension to be dimensional corrected. A welding material for repair, characterized in that pressure welding is performed so as to obtain a predetermined packing rate, and the linear members are joined together by a sintering means to be formed into a plate shape. 2. The welding material for repair according to claim 1, wherein the filling rate is 10 to 50%.