JP6050141B2 - Hardfacing welding apparatus and method - Google Patents

Description

  The present invention relates to a cured overlay welding apparatus and a cured overlay welding method.

  In the hardfacing welding, the hardfacing raw material used generally has low ductility. Therefore, when the hardfacing raw material is welded to the surface of the base material in the welding process, the temperature change of the welded portion is not rapid. Cracks are likely to occur due to thermal stress. For this reason, the base material is preheated, that is, preheated before the hardfacing raw material is melted on the surface of the base material, and further in the solidification stage after the hardened raw material is melted. In order to prevent a rapid temperature drop, the base material is heated, that is, post-heated.

A conventional preheating method is generally heating with an oxyacetylene burner. This preheating method has a problem that it takes a long time to reach a predetermined temperature.
As the overlay welding method for melting the cured overlay material on the surface of the base material, there are a covering arc welding method, a TIG method, a PTA method and the like. Since all of these welding methods have a large amount of heat input, the base material also absorbs a large amount of heat, and the base material is unlikely to drop in temperature rapidly in the solidification stage after melting the hardfacing raw material. Therefore, it is said that a post-heating process is usually unnecessary.
However, if the hardfacing material is ultra-hard, post-heat treatment is required to prevent thermal stress cracking that occurs due to a rapid temperature drop of the base material in the solidification stage after melting the hardfacing material. . After this, the heat is generally removed after heating with an oxygen acetylene burner, a panel heater, a furnace or the like.

Another method of overlay welding is laser welding. Since laser welding has a low heat input and the heating region can be narrowed, the heat input can be concentrated on the hardfacing raw material portion, thereby suppressing the melting of the base material and There is an advantage that dilution can be reduced.
However, in laser welding, since the heat input to the base material is small as described above, the temperature of the base material tends to change rapidly due to the influence of the surrounding environment. For this reason, when laser welding is used as the overlay welding method, it is generally recognized that the pre-heat treatment naturally requires post-heat treatment.

The following patent document 1 is given as a conventional document of laser welding using laser light.
Patent Document 1 discloses a laser brazing apparatus and method for melting only a brazing material without melting a workpiece. There is a description that pre-heat treatment is performed prior to brazing, but there is no description about post-heat treatment. This is because brazing does not need to be heated afterwards. In this respect, this laser brazing is a completely different technique from hard welding.

JP 2005-279686 A

In the case of hardening overlay welding, when post-heat treatment is performed, conventionally, heating by an oxygen acetylene burner, a panel heater, a furnace, or the like has been performed in the same manner as the pre-heat treatment. In addition to the problem that it takes a long time to reach the predetermined temperature as described above, the heating work by the burner is large and the amount of fuel used for obtaining the necessary amount of heat is finely adjusted. It is not easy. For this reason, there is a problem that overheating tends to occur and a large amount of fuel is wasted.
When laser welding is used as the overlay welding method, it is possible to narrow the heating area with low heat input. The need for If the heat treatment is performed by heating with an oxyacetylene burner after this, there is a problem that excessive heating tends to occur and a lot of fuel is wasted.

  An object of the present invention is to provide a hardfacing welding apparatus and method that can easily perform pre-heat treatment and post-heat treatment performed in hardfacing welding and reduce energy consumption.

In order to achieve the above object, a hardfacing welding apparatus according to the first aspect of the present invention includes a buildup raw material supply unit that supplies a hardfacing raw material to the surface of a base material, and the hardened meat on the surface of the base material. It is possible to execute at least one of a melting heating unit for melting the raw material, preheating by induction heating for the base material preceding the melting by the melting heating unit, and post-heating by induction heating for the base material after melting An induction heating unit , wherein the induction heating unit is a single induction coil wound with a plurality of windings, and the base material is surrounded by the induction coil and positioned inside, and rotates around an axis. However, the hardened material is melted, the melting and heating unit is a laser beam irradiation device, and the laser beam is irradiated to the hardened material from between adjacent windings of the induction coil. , characterized in that.

Induction heating such as high-frequency induction heating causes eddy current to flow through a metal member by electromagnetic induction by an induction coil, and generates heat by generating Joule heat due to the eddy current and electrical resistance of the metallic member itself. That is, the metallic member itself generates heat by the eddy current.
Accordingly, since only the portion where the eddy current flows is self-heated, it is directly heated and locally heated, and the heating efficiency can be easily improved as compared with the conventional indirect heating using a burner or a heater. Here, by increasing the heating frequency, heat can be generated more concentrated on the surface of the metallic member due to the phenomenon of the skin effect. In induction heating, there is no heat source such as a heater, so the surroundings do not have to be hot. Furthermore, since it is direct heating, rapid heating is possible.

  According to this aspect, since pre-heat treatment and post-heat treatment of hardfacing welding can be performed by the induction heating by the induction heating unit, the pre-heat treatment and post-heat treatment are directly heated by self-heating of the metal base material itself. Can be done easily. Moreover, since induction heating has a higher heating efficiency than conventional indirect heating by a burner or a heater, it is possible to reduce energy consumption when performing hardfacing welding.

Moreover, according to this aspect, the said base material is the structure enclosed by the said induction coil, is located inside, and also the said hardening build-up raw material is fuse | melted, rotating around an axial center. Therefore, the eddy current due to electromagnetic induction of the induction coil flows almost uniformly over the entire surface of the base material, and the hardfacing welded portion of the base material surface can be heated to a substantially uniform and uniform temperature throughout. it can. That is, it is possible to easily control the heating of the hardfacing welded portion on the surface of the base material during preheating and afterheating.
In addition, although it is an aspect different from this aspect, the base material is not surrounded by the induction coil and positioned inside, but the induction coil unit is positioned along the base material like an electromagnetic cooker, It is possible to heat the surface of the base material uniformly.

In addition, according to this aspect, since the melting and heating part is a laser beam irradiation device, it is a merit of laser welding. Heat can be concentrated, so that the advantage of suppressing the melting of the base material and reducing the dilution of the cured build-up raw material can be utilized. When performing hardfacing welding by laser welding, the need for the pre-heat treatment and post-heat treatment is particularly increased, but according to the present invention, it can be easily performed by self-heating of the metal base material itself by induction heating. .
In addition, although it becomes an aspect different from this aspect, a fusion | melting heating part is not limited to a laser beam irradiation apparatus. Examples of other melting and heating parts include a well-known covered arc welding method, TIG method, and PTA method.

Further , according to this aspect, the induction heating unit is one induction coil in which a winding is wound a plurality of times, and laser light is applied to the cured cladding material from between adjacent windings of the induction coil. Therefore, the laser welding and the induction heating can be combined easily and effectively with the structure.
In the hardening build-up welding, the hardening build-up raw material is usually supplied in a powder state to the hardening build-up welding portion on the surface of the base material. The powder raw material can also be supplied from between adjacent windings of the induction coil.

The hardfacing welding apparatus according to a second aspect of the present invention is the first aspect, wherein the base material is axially centered with respect to the induction heating unit, the overlaying material supply unit, and the melting heating unit. It is the structure which moves relatively along.

  The hardfacing welding is usually provided over a certain range along the axial direction of the base material. According to this aspect, since the base material is configured to move relative to the induction heating unit, the build-up raw material supply unit, and the melt heating unit along the axial center, the base material follows the axial direction of the base material. Hardened welding can be easily performed over the above range.

The hardfacing welding apparatus according to the third aspect of the present invention is characterized in that, in the first or second aspect, a non-contact temperature measuring unit that measures the surface temperature of the base material in a non-contact manner is provided. And
Here, the “base metal surface” where the temperature at the “base metal surface temperature” is measured is preferably the base metal surface in the vicinity of the hardfacing weld, but the temperature rises almost uniformly by induction heating. As long as it is within the range, it may be separated from the vicinity. Alternatively, it is also possible to measure the surface of the portion subjected to the hardfacing welding, that is, the surface of the hardfacing welded layer provided on the surface of the base material and use the measured value.

According to this aspect, since the non-contact temperature measurement unit is used, the temperature of the base material can be measured without being affected by electromagnetic induction due to induction heating.
In addition, the output of the induction heating unit can be adjusted according to the measured value of the temperature of the base material, so that it can be maintained in a temperature range aiming at the temperature of the surface of the base material.
In addition, it is possible to appropriately adjust the output of the melting and heating unit according to the measured value of the temperature of the base material, and thus it is possible to perform appropriate melting and heating.

In the hardfacing welding method according to the fourth aspect of the present invention, the preheating step of heating at least the surface of the base material by induction heating by the induction heating unit, and the surfacing for supplying the hardfacing raw material to the surface of the base material. A raw material supplying step, a melting and heating step for melting the cured build-up raw material on the surface of the base material that has undergone the preheating step by a melting and heating unit, and the molten portion after the melting and heating step by induction heating by an induction heating unit The induction heating unit is a single induction coil in which a winding is wound a plurality of times, and the base material is surrounded by the induction coil and positioned on the inner side, around the axis The cured build-up raw material is melted while rotating, the melting and heating unit is a laser beam irradiation device, and the laser beam is irradiated to the cured build-up material from between adjacent windings of the induction coil, you said

  According to this aspect, since the pre-heat treatment and post-heat treatment of hardfacing welding are performed by the induction heating by the induction heating unit, the pre-heat treatment and post-heat treatment can be easily performed by direct heating by self-heating of the metal base material itself. It can be carried out. Moreover, since induction heating has a higher heating efficiency than conventional indirect heating by a burner or a heater, it is possible to reduce energy consumption when performing hardfacing welding.

  Further, according to this aspect, the base material is located on the inner side surrounded by the induction coil, and the hardfacing raw material is melted while rotating around the axis. Therefore, the eddy current due to electromagnetic induction of the induction coil flows almost uniformly over the entire surface of the base material, and the hardfacing welded portion of the base material surface can be heated to a substantially uniform and uniform temperature throughout. it can. That is, it is possible to easily control the heating of the hardfacing welded portion on the surface of the base material during preheating and afterheating.

In addition, according to this aspect, since the melting and heating part is a laser beam irradiation device, it is a merit of laser welding. Heat can be concentrated, so that the advantage of suppressing the melting of the base material and reducing the dilution of the cured build-up raw material can be utilized. When performing hardfacing welding by laser welding, the need for the pre-heat treatment and post-heat treatment is particularly increased, but according to the present invention, it can be easily performed by self-heating of the metal base material itself by induction heating. .
Further, according to this aspect, the induction heating unit is one induction coil in which a winding is wound a plurality of times, and laser light is applied to the cured cladding material from between adjacent windings of the induction coil. Therefore, the laser welding and the induction heating can be combined easily and effectively with the structure.
In the hardening build-up welding, the hardening build-up raw material is usually supplied in a powder state to the hardening build-up welding portion on the surface of the base material. The powder raw material can also be supplied from between adjacent windings of the induction coil.

The hardfacing welding method according to the fifth aspect of the present invention is the fourth aspect, wherein the surface temperature of the base material is measured in a non-contact manner in at least one of the preheating step and the postheating step. And when the measured value is outside the set range, the output of the induction heating unit is adjusted.
According to this aspect, the temperature of the surface of the base material can be maintained within the set temperature range by adjusting the output of the induction heating unit according to the measured value of the temperature of the base material.

The build-up welding method according to the sixth aspect of the present invention is the method according to any one of the fifth aspects, wherein the surface temperature of the base material after the preheating step is measured in a non-contact manner, and the measurement value is set. When it is out of the range, the output of the melting and heating unit is adjusted.
According to this aspect, appropriate melting and heating can be performed by adjusting the output of the melting and heating unit according to the measured value of the temperature of the base material.

It is a schematic block diagram which shows Example 1 of the hardening overlay welding apparatus which concerns on this invention. It is sectional drawing of the part by which the overlay welding of the base material was carried out. It is a block diagram explaining the structure of the Example 1. FIG. It is a flowchart explaining control of the Example 1. FIG.

Hereinafter, Example 1 of the hardfacing welding apparatus according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the hardfacing welding apparatus of the first embodiment is a surfacing raw material supply unit 4 that supplies a hardfacing raw material 3 to the surface 2 of a long metal base material 1 having a circular cross section. A melting heating part 5 for melting the cured build-up raw material 3 on the surface 2 of the base material, preheating by induction heating for the base material 1 preceding the melting by the melting heating part 5, and the melting after the melting And an induction heating unit 6 capable of performing at least one of post-heating by induction heating on the base material 1.

Here, the raw material of the base material 1 is carbon steel, low alloy steel, stainless steel, etc., for example. The thickness (diameter) of the base material 1 is 50 mm to 80 mm. Of course, the material, thickness (diameter), and cross-sectional shape of the base material 1 are not limited to those described above.
The hardfacing raw material is, for example, a cobalt alloy such as stellite or a nickel alloy such as colmonoy. In the hardfacing welding, a powdered hardfacing raw material is usually used, but the raw material is not limited to a powdery one, and may be other shapes such as a rod.

[Induction heating section]
First, the induction heating unit 6 will be described.
Induction heating such as high-frequency induction heating causes eddy currents to flow through the metal base material 1 due to electromagnetic induction by the induction coil 7, and Joule heat is generated by the eddy current and the electrical resistance of the base material 1 itself. To do. That is, the base material 1 itself self-heats due to the eddy current.
Therefore, inductive heating is directly heated because only the portion where the eddy current flows is self-heated, and is also locally heated, so that the heating efficiency can be easily improved as compared with conventional indirect heating using a burner or a heater. By increasing the heating frequency during induction heating, heat can be generated more concentrated on the surface of the base material 1 due to the phenomenon of the skin effect. In addition, since there is no heat source such as a heater in induction heating, the temperature around the base material 1 does not have to be high, and the temperature control is further facilitated, and heating damage to the build-up raw material supply unit 4 is suppressed. it can. Furthermore, since it is direct heating, rapid heating is possible.

  In the first embodiment, the induction heating unit 6 is the induction coil 7 as described above. As shown in FIG. 1, the base material 1 is surrounded by the induction coil 7, is located on the inner side, and the hardfacing supplied to the surface 2 of the base material 1 while rotating around the axis 8. In this configuration, the raw material 3 is melted by the heat from the melting and heating unit 5. As shown in FIG. 2, the cured overlay weld layer 9 having a uniform thickness is obtained by this melting while rotating. The hardfacing welded layer 9 is usually finally polished.

  Due to the induction coil 7 having the above-described configuration, eddy current due to the electromagnetic induction flows almost uniformly on the entire surface of the base material 1, and the hardfacing welded portion 14 of the base material surface 2 is substantially uniformly and uniformly over the entire surface. It can be heated to any temperature by self-heating. The heating temperature can be easily controlled by changing the current supplied to the induction coil. That is, it is possible to easily control the heating of the hardfacing welded portion 14 of the base material surface 2 during preheating and afterheating. Moreover, preheating and afterheating can be performed in series.

[Melting and heating section]
Next, the melting and heating unit 5 is a laser beam irradiation apparatus 10 in this embodiment. The laser beam irradiation apparatus 10 includes a condensing lens 11 and irradiates a portion of the surface 2 of the base material 1 to which the hardfacing raw material 3 is supplied by condensing the laser light 12 that has passed through the condensing lens 11. Is done. And the hardening build-up welding layer 9 can be provided over the perimeter because the base material 1 rotates.
Further, as will be described later, the base material 1 moves relative to the laser light irradiation device 10 and the like in the direction 13 along the axis, thereby causing a certain range along the axis direction of the base material 1 (hardened overlay). A hardened weld layer 9 can be provided on the welded portion 14).

  Constructing the melt heating part 5 with the laser light irradiation device 10 concentrates the heat input on the cured build-up raw material part 14 by being able to narrow the heating region with low heat input, which is a merit of laser welding. Therefore, it is possible to take advantage of the advantage that the melting of the base material 1 can be suppressed and the dilution of the cured build-up raw material 3 can be reduced. When heat build-up welding is performed by laser welding, the amount of heat input is small, so the necessity of the pre-heat treatment and post-heat treatment is particularly increased. According to this configuration, both the pre-heat treatment and post-heat treatment are performed by induction heating. This can be easily done by the self-heating of the 1 itself.

In the first embodiment, the laser beam 12 of the laser beam irradiation apparatus 10 is configured to irradiate the cured cladding material 3 from between adjacent windings 7 a and 7 b of the induction coil 7.
With this configuration, the laser beam 12 is applied to the cured material 3 from between adjacent windings 7a and 7b of the induction coil 7, so that laser welding and induction heating can be combined in a simple and effective manner. Can do.
In the hardening build-up welding, the hardening build-up raw material 3 is normally supplied to the hardening build-up welding portion 14 of the base material surface 2 in a powder state. In the first embodiment, the powder raw material is supplied from between the adjacent windings 7 a and 7 b of the induction coil 7. Of course, raw materials other than powder can be similarly used.

[Non-contact temperature measurement unit]
The first embodiment includes a non-contact temperature measuring unit 15 that measures the surface temperature of the base material 1 in a non-contact manner. Here, as the non-contact temperature measurement part 15, a radiation thermometer is mentioned, for example.

  As described above, the surface of the base material 1 at which the temperature at the surface temperature of the base material 1 is measured is preferably the base material surface 2 in the vicinity of the hardfacing welded portion 14. However, the base material surface 2 within a range in which the temperature rises substantially uniformly by induction heating may be separated from the vicinity. Alternatively, it is also possible to measure the surface of the portion 14 that has undergone hardfacing welding, that is, the surface of the hardfacing welded layer 19 provided on the surface of the base material 1 and use the measured value.

With the configuration using the non-contact temperature measurement unit 15, the temperature of the base material 1 can be measured without being affected by electromagnetic induction due to induction heating.
Further, the output of the induction heating unit can be adjusted according to the measured value of the temperature of the base material 1, thereby maintaining the temperature range aiming at the temperature of the base material surface 2.
In addition, it is possible to appropriately adjust the output of the melting and heating unit 5 according to the measured value of the temperature of the base material 1, so that appropriate melting and heating can be performed.

[Move base material]
In Example 1, the base material 1 is added to the induction heating unit 6 (induction coil 7), the build-up raw material supply unit 4, the melt heating unit 5 (laser light irradiation device 10), and the non-contact temperature measurement unit 15. On the other hand, it is the structure which moves relatively along an axial center. Here, the induction heating unit 6 (induction coil 7), the build-up raw material supply unit 4, the melt heating unit 5 (laser light irradiation device 10), and the non-contact temperature measurement unit 15 are assembled in a single moving unit 16. Yes. The moving unit 16 is configured to be movable in a direction 13 along the axis with respect to the base material 1 whose position is fixed.

Further, the base material 1 is supported by the rotation mechanism 17 so as to rotate about the axis 8.
That is, the base material 1 is surrounded by the induction coil 7 and positioned inside as described above, and the hardened meat supplied to the surface 2 of the base material 1 while rotating around the axis 8 by the rotation mechanism 17. In this configuration, the raw material 3 is melted by the heat from the melting and heating unit 5.
As a specific structure of the rotation mechanism 17, the base material 1 may be directly connected to the rotation shaft of the motor via a holder, or a structure for transmitting power via a gear train.

In general, the hardfacing welding is provided over a certain range (hardening surfacing weld portion 14) along the axial direction 13 of the base material 1. According to this configuration, the base material 1 is fixed with respect to the direction 13 along the axis, and the induction heating unit 6, the build-up raw material supply unit 4, the melt heating unit 5, and the non-contact temperature measurement unit 15 are integrated. Thus, since it is configured to move along the direction 13, it is possible to easily carry out the hardfacing welding over the range (hardening welded portion 14) along the axial direction of the base material 1.
Specifically, by associating the rotational speed of the base material 1 and the moving speed in the direction 13 along the axis, a series of hardfacing weld lines are formed spirally on the surface 2 of the base material 1, Thereby, the hardfacing welded layer 9 can be formed. As described above, the hardfacing welded layer 9 is usually finally polished.

FIG. 3 is a block diagram showing the relationship among the constituent members of the first embodiment.
The induction heating unit 6, the build-up raw material supply unit 4, the melt heating unit 5, and the rotation mechanism 17 are driven in response to a control signal sent from the control unit 18. The moving unit 16 is also driven in response to a control signal sent from the control unit 18.
The temperature information measured by the non-contact temperature measuring unit 15 is sent to the control unit 18, and various controls are executed based on this temperature information.

[Explanation of curing overlay welding method]
Based on the flowchart of FIG. 4, an example of the hardening build-up welding method using the said hardening build-up welding apparatus is demonstrated.
In step S1, a current is supplied to the induction coil 7 and preheating of the base material 1 is started by induction heating. Thereby, the part surrounded by the induction coil 7 of the base material 1 is preheated to a substantially uniform set temperature. At this stage, the base material rotating mechanism 17 is driven to rotate the base material 1 around the axis 8.

In step S2, the temperature of the surface 2 of the base material 1 is measured constantly or at regular intervals by the non-contact temperature measuring unit 15, and the measured temperature information is sent to the control unit 18, and the measured value is within the set range. Judgment is made.
If it is determined that it is not within the set range, the process proceeds to step S3, and the induction heating output is adjusted to be within the set range. Specifically, when the temperature is lower than the set temperature, the output is increased, and when the temperature is higher than the set temperature, the output is decreased. Then, after a predetermined time has elapsed, the process returns to step S2.
If it is determined that it is within the set range, the process proceeds to step S4.

  In step S <b> 4, the cured build-up raw material 3 is supplied from the build-up raw material supply unit 4 to the base material surface 2 by a control signal sent from the control unit 18. Moreover, the laser beam 12 is irradiated from the melting and heating unit 5, the cured build-up raw material 3 is melted, and build-up welding is performed. At this time, since the base material 1 is rotating, build-up welding proceeds in the circumferential direction of the base material 1. Further, the base material 1 moves at a predetermined speed in the direction 13 along the axis, whereby a series of hardfacing weld lines are formed in a spiral on the surface 2 of the base material 1, whereby the hardfacing weld layer 9 is formed. Can be formed.

  The measurement of the base material surface temperature described in Steps S2 and S3 and the output adjustment of induction heating based on the measurement are performed in parallel during the hardfacing welding. Therefore, it is possible to prevent the preheating necessary for the hardfacing welding from being insufficient or excessive.

Next, it progresses to step S5, it is judged whether the hardening build-up welding was performed over the whole range (hardening build-up welding part 14), and if not yet (NO), it returns to step S4.
When the hardening build-up welding is performed over the entire range (the hardening build-up welding portion 14) (YES), the process proceeds to step S6.

In step S6, the preheating process ends and the postheating process starts. The melting and heating unit 5 is turned off, and the molten hardfacing raw material 3 is gradually cooled without causing a rapid temperature drop. Therefore, induction heating by the induction heating unit 6 is continued.
That is, during the post-heating process, the measurement of the base material surface temperature described in steps S2 and S3 and the output adjustment of induction heating based on the measurement are performed in parallel. Therefore, it is possible to prevent the post heat necessary for the hardfacing welding from being insufficient.

  And it progresses to step S7 and is complete | finished when a post-heating process is complete | finished. This determination can be made by elapse of time by determining the time of the post-heating process in advance.

[Operation of Example 1]
According to the first embodiment, the pre-heat treatment and post-heat treatment of hardfacing welding can be performed by induction heating by the induction heating unit 6, and thus the pre-heat treatment and post-heat treatment are performed by self-heating of the metal base material 1 itself. Can be done easily by direct heating. Moreover, since induction heating has a higher heating efficiency than conventional indirect heating by a burner or a heater, it is possible to reduce energy consumption when performing hardfacing welding.

  The base material 1 is surrounded by the induction coil 7 and is located on the inner side, and the hardfacing material 3 is melted while rotating around the axis 8. Therefore, the eddy current due to electromagnetic induction of the induction coil 7 flows almost uniformly on the entire surface of the base material 1, and the hardfacing welded portion 14 of the base material surface 2 is brought to a substantially uniform and uniform temperature throughout. Can be heated. That is, it is possible to easily and continuously perform heating control on the hardened welded portion 14 on the base material surface 2 during preheating and afterheating.

[Other Examples]
Of course, the present invention is not limited to the structure of the first embodiment. For example, the following configuration is also possible.

(1) In the first embodiment, the base material 1 is surrounded by the induction coil 7 and is located on the inner side, and the hardfacing raw material 3 is melted while rotating around the axis 8. With this configuration, an eddy current due to electromagnetic induction of the induction coil 7 flows substantially uniformly over the entire surface of the base material 1, and the hardfacing welded portion 14 of the base material surface 2 is substantially uniformly and uniformly over the entire surface. Can be heated to temperature.
However, you may comprise as follows.
Even if the base material 1 is not surrounded by the induction coil 7 and positioned inside, but the induction coil unit is positioned along the base material 1 like an electromagnetic cooker, the base material surface 2 is uniformly heated. It is possible.

(2) In Example 1, although the fusion | melting heating part 5 is the laser beam irradiation apparatus 10, it is not limited to this. Examples of other melting and heating parts include a well-known covered arc welding method, TIG method, and PTA method.

1 base material, 2 surface, 3 hardfacing raw material, 4 surfacing raw material supply section,
5 Melting heating part, 6 Induction heating part, 7 Induction coil, 8 Axis center,
9 Hardfacing weld layer, 10 Laser irradiation device, 11 Condensing lens,
12 laser beam, 13 direction along axis, 14 hardfacing welded part,
15 non-contact temperature measurement unit, 16 moving unit, 17 base material rotation mechanism,
18 Control unit

Claims (6)

A build-up raw material supply unit for supplying a hard-filled build-up raw material to the surface of the base material;
A melting and heating section for melting the cured build-up raw material on the surface of the base material;
An induction heating unit capable of performing at least one of preheating by induction heating on the base material preceding the melting by the melting heating unit and post-heating by induction heating on the base material after the melting;
The induction heating unit is one induction coil in which a winding is wound a plurality of times,
The base material is located inside and surrounded by the induction coil, and the hardfacing material is melted while rotating around an axis.
The melting and heating unit is a laser beam irradiation device,
The cured build-up welding apparatus, wherein the laser beam irradiated from the laser beam irradiation apparatus is applied to the cured build-up raw material from between adjacent windings of the induction coil. In the cured overlay welding apparatus according to claim 1 ,
The hardfacing welding apparatus characterized by the said base material being the structure which moves relatively along an axial center with respect to the said induction heating part, the said build-up raw material supply part, and the said fusion | melting heating part. In the hardfacing welding apparatus according to claim 1 or 2,
A hardfacing welding apparatus comprising a non-contact temperature measuring unit that measures the surface temperature of the base material in a non-contact manner. A preheating step of heating at least the surface of the base material by induction heating by an induction heating unit;
A build-up raw material supply step of supplying a hard-build raw material to the surface of the base material;
A melting and heating step of melting the cured build-up raw material on the surface of the base material that has undergone the preheating step by a melting and heating unit;
A post-heating step of heating the melted portion after the melting and heating step by induction heating by an induction heating unit,
The induction heating unit is one induction coil in which a winding is wound a plurality of times,
The base material is located inside surrounded by the induction coil, and the hardfacing raw material is melted while rotating around an axis,
The melting and heating unit is a laser beam irradiation device,
The cured overlay welding method, wherein the laser beam irradiated from the laser beam irradiation device is irradiated to the cured overlay material from between adjacent windings of the induction coil. In the hardening overlay welding method according to claim 4,
Measuring the surface temperature of the base material in a non-contact manner in at least one of the preheating step and the postheating step, and adjusting the output of the induction heating unit when the measured value is outside the set range; Hardened overlay welding method characterized by In the hardening overlay welding method according to claim 5,
A hardfacing welding method characterized by measuring the surface temperature of the base material after the preheating step in a non-contact manner and adjusting the output of the melting and heating part when the measured value is outside the set range.

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