JPH11197861A - Method for build-up welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration in quality of a material of a machine parts as a base material in the case where build-up layers are formed on a part of the base material. SOLUTION: Into a moulding flask 5 provided along an inner peripheral surface of a hole 4 made on a base material 1 a powdered welding matter 2 is put and is subjected to compression moulding. A friction bar 3 is force-fitted while being rotated between the base material 1 and the welding matter 2 and is shifted along the peripheral direction of the hole 4 as well, and then by frictional heat generating between the base material 1 and the friction bar 3 the base material 1 and the welding matter 2 areplasticized and at the same time by the motion of the friction bar 3 the plasticzed component is fluidized and mixed. Thereby, fuild-up layers of a mixture of the base material 1 and the welding matter 2 are formed on the inner peripheral surface of the hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for overlay welding a part of a base material to be welded.

[0002]

2. Description of the Related Art For example, when it is necessary to form a weld along a side surface of a member, a weld overlay is formed on the side surface of the member by employing a fusion welding method such as tungsten arc welding. It is common to do.

[0003]

However, in the case where the overlay is performed by the above-described fusion welding method, the following problems are raised. (1) When the fusion welding method is adopted, there is a possibility that the mechanical component as a base material is exposed to a high temperature and the material is deteriorated. (2) The fusion welding method can be applied only when both the base material and the weldment are metal.

The present invention has been made in view of the above circumstances, and provides a build-up welding method capable of forming a build-up of a desired shape on a portion to be welded of a base material in the manner of friction welding. It is intended to be.

[0005]

As a means for solving the above-mentioned problems, the following overlay welding method is employed. In this overlay welding method, a powdery or chipped welded product is put into a mold placed along a welded portion of a base material, compression-molded, and a friction rod is provided between the welded material and the base material. While rotating it and rotating it along the part to be welded, plasticizing the base metal and weldment by the frictional heat generated between the base metal and the friction rod, and causing the plasticizing component to flow by the motion of the friction rod. To form a build-up layer in which the base material and the weldment are mixed along the welded portion.

In the above overlay welding method, the operation of moving the friction rod along the welded portion is repeated a plurality of times, and the distance between the welded portion and the friction rod is gradually increased each time the operation is repeated. It is also possible to increase the thickness by forming a build-up layer by lamination.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the overlay welding method according to the present invention, FIGS. 1 and 2 show a case where an overlay is formed along an inner peripheral surface of a circular hole provided in a base material. Will be explained.

FIG. 1 shows a base material 1 to be welded and a workpiece 2.
And a friction bar 3 are shown. The base material 1 is a plate having a uniform thickness, and has a circular hole 4 to be overlaid in the thickness direction. The weldment 2 is powdered, accommodated in a mold 5 installed along the peripheral surface of the hole 4, and compression molded. The friction bar 3 is made of a cemented carbide heat-resistant alloy having an extremely high melting temperature as compared with the base material 1 and the welded material 2 and is formed in a columnar shape. It revolves in the circumferential direction. A groove for receiving the weldment 2 is formed in the formwork 5 along the circumference of the hole 4, an outer side wall 5 a forming the groove is in contact with the lower surface of the base material 1, and an inner side wall 5 b is formed in the hole. 4 has a shape that covers the inner peripheral surface and extends upward beyond the upper surface of the base material 1.

With respect to the inner peripheral surface of the hole 4 provided in the base material 1,
The overlay is applied through the steps shown in FIG. First, as shown in FIG. 1, a mold 5 is installed along the inner peripheral surface of the hole 4 to be a portion to be welded.

The powdery welded material 2 is put into the mold 5 and a high pressure is applied from above, and compression molding is performed according to the shape of the mold 5. As for the compression operation, the powder of the weldment 2 is compressed in the same manner as in the compression step in the processing of the sintered material.

A friction bar 3 mounted on a driving device (not shown)
(See FIG. 2 (a)), and the tip is
Press-contact from the upper surface of the base material 1 to the boundary between
The base material 1 begins to plasticize due to frictional heat generated between the base material 1 and the friction rod 3, and similarly, the weldment 2 also begins to plasticize due to frictional heat. Therefore, the friction bar 3 is inserted under pressure between the plasticized base material 1 and the weldment 2.

The friction bar 3 is inserted under pressure between the base material 1 and the weldment 2 so as to pass through the base material 1 (see FIG. 2B).
When the friction bar 3 is moved along the inner peripheral surface of the hole 4 while continuing the rotation motion, the surrounding base metal 1 and the weldment 2 are caused by frictional heat generated between the side surface of the friction bar 3 and the base material 1. Plasticized,
Furthermore, both of them flow and mix due to the rotation and revolving motion of the friction bar 3. Then, after the friction bar 3 has passed, a build-up layer A is formed along the inner peripheral surface of the hole 4 in which the base material 1 and the weldment 2 are mixed in a plasticized state (FIG. 2C).
reference).

The thickness of the build-up layer A formed on the inner peripheral surface of the hole 4 due to the circumferential movement of the rotating friction bar 3 is substantially proportional to the diameter of the friction bar 3. Therefore, in order to form a thick build-up, the operation of moving the friction bar 3 in the circumferential direction (movement in the revolving direction) is repeated a plurality of times. The distance from the friction bar 3 is gradually increased. This allows
In the second and subsequent movement operations, the build-up layer A formed by the previous movement operation and the weldment 2 are plasticized and mixed, and new build-up layers A ′, A ″,. 2 (d)
reference).

If the above-mentioned overlay welding method is employed, the overlay 1 can be formed by mixing the base metal 1 and the workpiece 2 in a plasticized state on the inner peripheral surface of the hole 4. ,
Material deterioration and distortion of the base material 1 can be suppressed.
Moreover, the cost required for welding can be reduced as compared with the case where arc welding or the like is performed.

The moving operation of the friction bar 3 along the inner peripheral surface of the hole 4 is repeated a plurality of times, and the distance between the base material 1 and the friction bar 3 is gradually increased each time the moving operation is repeated. By forming the layers A, A ′, A ″,... In layers, the thickness and shape of the build-up layer can be freely formed.

[0016]

EXAMPLE With respect to the above-mentioned overlay welding method, overlay welding was actually carried out along the inner peripheral surface of the hole under the following conditions, and good results were obtained. 1. Base material: aluminum alloy (AMS4218) Inner diameter of hole: 50 mm, depth of hole (thickness of base material): 10 m
About m2. Weldment: same aluminum alloy as base metal (AMS4218)
2. Powder of Friction bar: Ni-Cr-Mo-steel (or Ni superalloy)

In the above embodiment, the circular hole 4
Although the case where the ring-shaped overlay layer is formed along the inner peripheral surface of the above has been described, the welded portion where the overlay can be formed by the overlay welding method of the present invention is not limited to the inner peripheral surface of the hole. However, as shown in FIG. 3, a straight end face 11 of the base material 10, an end face 13 of the base material 12 arbitrarily bent, and the like are also included. Further, the present overlay welding method can be applied to the overlay formation of members other than metal.

[0018]

As described above, according to the overlay welding method according to the present invention, a powdery or chip-shaped welded product is put into a mold installed along a welded portion of a base material. Compression molding, press-fitting while rotating a friction rod between the welded material and the base material and moving it along the welded part, and using the frictional heat generated between the base material and the friction rod, the base material and the welded material It is possible to form a build-up layer by mixing and plasticizing the base metal and the welded material in the welded part at the welded part by plasticizing and mixing the plasticized components by the rotation motion of the friction rod and flowing it. In addition, it is possible to suppress the occurrence of material deterioration and distortion of the base material and the welded article. Moreover, the cost can be significantly reduced as compared with the case where arc welding or the like is performed.

The operation of moving the friction rod along the portion to be welded is repeated a plurality of times, and each time the operation is repeated, the distance between the portion to be welded and the friction rod is gradually widened to form a layered buildup. In addition, the thickness and shape of the overlay can be freely formed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a build-up welding method according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a state of a base material and a welded material in each step of overlay welding.

FIG. 3 is a perspective view showing another embodiment of the overlay welding method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Weldment 3 Friction rod 4 Hole 5 Formwork A, A ', A' 'Overlay layer

Claims (2)

[Claims] 1. A powdered or chipped welded product is put into a mold set along a welded portion of a base material, compression-molded, and a friction rod is rotated between the welded material and the base material. While moving along the welded part while plasticizing the base metal and the welded material by the frictional heat generated between the base metal and the friction rod, and moving and mixing the plasticized components by the movement of the friction rod. And forming a build-up layer in which the base material and the weldment are mixed along the welded portion. 2. The method according to claim 1, wherein the moving operation of the friction bar along the welded portion is repeated a plurality of times, and each time the moving operation is repeated, the distance between the welded portion and the friction bar is gradually increased to increase the build-up. The overlay welding method according to claim 1, wherein the layers are formed by lamination.