JPS6117398A - Production of high alloy welding rod - Google Patents

Abstract

PURPOSE:To reduce the cost of a welding rod and to improve the yield thereof by compounding required metallic powder and non-metallic powder to provide the chemical compsn. of the target welding rod then molding the powder to a bar shape and subjecting the molding to sintering or hot hydrostatic working thereby solidifying the molding. CONSTITUTION:The required metallic powder or further the non-metallic powder are compounded and the powder 2 consisting of the compsn. conforming to the chemical compsn. of the target welding rod is obtd. in a raw material compounding stage 1. The powder 2 is pressurized by dies 3a, 3b and is molded to the rod shape 4 in a molding stage 3. The molding is sintered by vacuum or atmospheric sintering or is pressurized and sintered by a hot hydrostatic press device in a solidifying stage 5, by which the powder is solidified and a welding rod product 6 is obtd. The need for surface grinding and machining, etc. of the conventional continuous casting billet is eliminated by the above-mentioned method, by which the yield of the material is improved and the cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing high alloy welding rods at low cost and with good yield.

<Prior art> High alloy welding rods used for bath welding or overlaying metal materials such as corrosion-resistant materials, heat-resistant materials, wear-resistant materials, etc. contain high alloy components or non-metallic components for improving weldability, such as S10.
Many types of imported materials have chemical compositions containing ceramic powder such as At207, and their deformability during processing is extremely poor, making wire drawing processing, which involves a large number of manufacturing steps, difficult. Therefore, conventionally, welding rod products have been manufactured by processing melted ingots or continuous casting billets into rod shapes by G-plate processing. However, this conventional method has the disadvantage that the yield of the product is poor and the manufacturing cost is extremely high.

<Objective of the Invention> The present invention aims to provide a method for manufacturing a high-alloy welding rod that eliminates the drawbacks of the above-mentioned conventional methods, increases the yield, and reduces manufacturing costs.

<Structure of the Invention> That is, the present invention consists of: (1) obtaining a composition Ω powder that matches the chemical composition of the target welding rod by blending a required metal powder or a nonmetal η powder;
A method for manufacturing a high alloy welding rod, which is characterized by forming the rod into a rod shape and hardening it by sintering or hot isostatic processing. A powder made by blending non-metallic powder with powder or clay is formed into a rod shape to obtain a rod with a composition matching the chemical composition of the target welding rod, which is then solidified by sintering or hot isostatic processing. A method for manufacturing a high-alloy welding rod that is characterized by its ability to form an awn.

The gist is:

Example> The manufacturing power 'Fk of the present invention will be specifically explained below based on the drawings.

FIG. 1 is a process diagram showing an example of the manufacturing method according to claim 1 of the present invention.

The manufacturing method shown in Figure 1 begins with a raw material blending step (1) in which a required metal powder or non-metallic powder is blended to produce a powder (2) with a composition that matches the chemical composition of the target welding rod. This powder (2) is then molded in the molding step (3), for example, using a mold compaction method (a method in which the powder is pressure molded using upper and lower molds (3a) (81)) or an extrusion molding method (powder + binder (2)). ') into an extrusion mold (3C) and molded into a rod (4) using an extrusion mold (extrusion molding method in step 3), and this rod-shaped molded product (4)
In the next solidification step (5), the rods are solidified by vacuum or atmosphere sintering, or by pressure sintering using a encapsulation (-, hot isostatic pressure) press machine to form a welded rod product. (6). Or furthermore, for example, Fufutsuknu a3
Pass the product (6) through the mold (14) filled with
Apply a suitable coating to prepare the ε welding rod product (6).

FIG. 2 is a process diagram showing an example of the manufacturing method according to claim 2 of the present invention.

The manufacturing method shown in Fig. 2 begins with a wire drawing step (7), in which a target metal or alloy (generally Fei or Fe-based alloy, Ni- or N'x-based alloy, etc.) and draw the wire to obtain the drawn wire material (8), while also performing the raw material blending process (
In step 1), powder (9) is produced by blending the remaining required components of metal powder or non-metal powder. Next, in a molding step (3), the powder (9) is molded into a rod shape using the wire drawing material (8) as a core, for example, by a mold compaction method or an extrusion molding method, thereby forming a metal/non-metallic material made of the powder (9). A metal powder layer αO (hereinafter simply referred to as a powder layer) is formed to obtain a rod body 0υ whose composition matches the chemical composition of the target welding rod. Next, in the solidification step (5), the rod 01) is solidified into a filler rod product 02 by vacuum or atmosphere sintering or hot isostatic processing, as described above. Furthermore, in the same manner as above, coated welding rod (
12).

In addition, in the manufacturing method shown in Figure 2, if necessary, the powder (9) obtained in the raw material blending step (1) is
In the next forming step (3), the first group of the groups is formed into a rod shape using the drawn wire material (8) as a core, as shown in the perspective view of FIG. 3, for example. Gotoku 1
A powder layer (10/) is formed, and a second group is formed into a rod shape on top of it to form a second powder layer (lOx).
It is also possible to obtain a rod αυ consisting of a plurality of powder layers with the drawn wire material (3) as a core.

That is, the method for manufacturing a high alloy welding rod of the present invention includes using a drawn wire material as a core, metal powder or nonmetallic powder having a chemical composition selected in consideration of the target chemical composition of the welding rod as described above,
Alternatively, since it is formed into a rod shape and solidified to form a welding rod without using wire drawing material, it is possible to adjust the chemical composition of the welding rod extremely easily, and it is possible to make it easier to adjust the chemical composition of the welding rod than the conventional manufacturing method from an ingot. Compared to 1C, it is possible to design a wide range of components, which has the advantage of diversifying the scope of application, and it also eliminates the need for surface grinding of continuous casting billets and machining for shape adjustment, greatly increasing material yield. This makes it possible to reduce manufacturing costs.

<Effect of the invention> Next, the effects of implementing the method of the present invention will be explained.

Three tests were conducted to determine whether it is possible to obtain the target high-alloy deposited metal using the high-alloy welding rod manufactured by the method of the present invention in the same way as the high-alloy welding rod manufactured by the conventional method. .

(1) Stellite welding rod test For welding stellite with a specified chemical composition, Ni powder Q
, 5 wt%, 80Cr-70Ca powder g B wt%, W
An alloy powder consisting of 4.5 wt% of powder and 2.9 wt% of C○ powder was formed into a rod shape using a mold compaction method, solidified by hot isostatic pressing, and then coated with a coating material. As a result of welding by T welding using all alloy bath working rods, the welding properties were satisfactory and met the target chemical composition.
-280r-4,5W-67Go to fx M weld metal was obtained.

(2+ High alloy (50Cr-50M) welding test 50
For welding Cr-5ONi, high alloy, core composition: pure N1 powder bed composition: 75Cr = 25Ni.

A high platform metal bath was manufactured by forming the powder layer into a rod shape with the core at the center, with a core:powder layer weight ratio of 38:67, solidifying it by full vacuum sintering, and then applying a coating material. As a result of TIG welding using a welding rod, 50Cr-5ONi that matched the target chemical composition was obtained.
A bath-deposited metal having the composition was obtained.

(3) Inconel 718 common welding rod test For welding Inconel 718 with a specified chemical composition, the following is true: Core component: Pure N1 First powder component: Pure Fe Second powder component: Core: First powder layer :The weight ratio of the second powder layer is 4.0.
:19:41, the first powder layer is formed into a rod shape on the above core, and the second powder layer is formed into a rod shape by stacking VC on top of the core, which is solidified by vacuum sintering, and then a coating agent is applied. As a result of welding by T welding using a high platform metal bath welding rod, we obtained 52Ni-190 that met the target chemical composition.
r-2,7Mo-0,9Ti-5,5N'b-0,6A
A close contact metal having a composition consisting of t, -19Fe was obtained.

The high alloy welding rod manufactured by the method of the present invention as described above is
Like conventional welding rods, high-alloy materials can be welded without any problems, resulting in improved yields and reduced conuts.

As is clear from the above explanation, the method for manufacturing high alloy welding rods of the present invention makes it possible to eliminate the mechanical process compared to the conventional method of manufacturing by forming a molten ingot into a rod shape by machining. This greatly contributes to improving yields and reducing manufacturing costs in the production of high-alloy welding rods8.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an example of the manufacturing method according to claim 1 of the present invention, and FIG.
FIG. 8 is a perspective view illustrating the structure of a high-alloy welding rod having multiple layers of powder jiso.

Claims (2)

[Claims] (1) Mix the required metal powder or non-metallic powder to obtain a powder with a composition that matches the chemical composition of the target welding rod, form it into a rod shape, and process it by sintering or hot isostatic processing. A method for producing a high alloy welding rod, which is characterized by solidifying it. (2) A rod with a composition that matches the chemical composition of the target welding rod is created by forming a powder made by blending the required metal powder or non-metallic powder into a rod with a metal or alloy wire drawing material as the core. 1. A method for producing a high alloy welding rod, which comprises obtaining a high-alloy welding rod and solidifying it by sintering or hot isostatic processing.