JPS58187277A - Joining method of hard fusion weldable member - Google Patents

Abstract

PURPOSE:To join a hardly fusion-weldable member firmly and stable, and to prevent it from falling off, by fusion-welding and brazing an insert ring made of a fusion-weldable material, which is pressed in coupled with the hardly fusion weldable member, to the other member, when joining the hardly fusion- weldable member to the other member. CONSTITUTION:A hardly fusion-weldable member 11 of a sintered hard alloy, ceramics, etc. and an insert ring 12 made of a fusion-weldable material are pressed in and are coupled with each other. Subsequently, this member is inserted into a hole 13a being a fitting part of the other member 13. In that case, a brazing material 14 is interposed between the hole 13a of the member 13 and the member 11. Thereafter, the member 13 and the ring 12 are joined by electronic beam welding 15. In that case, the electronic beam is throttled so that the member 11 is not melted. Subsequently, the member 13 is heated by a vacuum furnace or an inert atmospheric furnace, the brazing material 14 is melted, and the member is joined by a brazing material 14'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for joining difficult-to-weld members such as cemented carbide and ceramics (members that are difficult to join by melting and solidifying base materials into a molten state).

For example, in a pelletizer die 1 as shown in FIG.
A member 3 made of cemented carbide or ceramic was attached to the exit side of the die nozzle 2 through which the resin passes. This is to prevent wear of the pelletizer die l due to contact with the cutter blade. Conventionally, the member 3 was brazed to the pelletizer die 1 as shown in FIG.
The filler metal is indicated schematically by reference numeral 4 in FIG. 2).

However, with such a brazing method, a certain degree of variation in quality cannot be avoided, and parts of the brazed part may peel off due to insufficient strength, causing the member 3 to fall off.

The present invention has been made by focusing on the above-mentioned problems in the conventional joining methods of refractory welding members, and it is possible to convert refractory welding members such as cemented carbide members and ceramic members into members with good fusion weldability. The refractory welding member, which is press-fitted into a manufactured insert ring and bonded with the insert ring, is assembled to the mating member with a brazing metal interposed between the two parts, the insert ring is joined to the mating member by electron beam welding, and then the soldering The purpose is to solve the above problems by melting the materials and brazing the difficult-to-weld member and the mating member.

Hereinafter, the present invention will be explained based on FIGS. 3 to 6 of the accompanying drawings showing embodiments thereof.

First, as shown in FIG. 3, fusion welding is possible with a difficult-to-weld member 11 made of cemented carbide, ceramic, etc., which is difficult to fusion weld or is incapable of TIT (for example, a cemented carbide chip of a die for a pelletizer). and an annular insert ring 12 made of a suitable material by press fitting. Next, as shown in FIG. 4, the refractory welding member 11 combined with the insert ring 12 is inserted into the hole 13a which is the mounting portion of the mating member 13 (for example, a pelletizer die). At that time, the mating member 13 and the hole 13a
A brazing material 14 is interposed between the and the refractory welding member 11. Next, as shown in FIG. 5, the mating member 13 and the insert ring 12 are joined by electron beam welding (the bead portion formed by electron beam welding is indicated by reference numeral 15). At this time, the electron beam is narrowly focused to perform the welding so as not to melt the refractory welding member 11. Next, the mating member 13 is heated in a vacuum furnace or an inert atmosphere furnace to melt the brazing material 14, and as shown in FIG.
Join by. At this time, the refractory welding member 11 is fixed to the mating member 13 by an insert ring 12 that is electron beam welded, and the refractory welding member 11 does not float up during brazing. Therefore, stable quality can be achieved. For brazing, parts are obtained.

Next, a second embodiment shown in FIGS. 7 to 10 will be described. In this embodiment, as shown in FIG. 7, a refractory welding member 11'
The insert ring 12' has a tapered shape, and correspondingly, the thickness of the insert ring 12' is changed in the axial direction into a tapered shape. As shown in FIGS. 8 to 10, the refractory welding member 11' is joined to the mating member 13 by the same steps as in the first embodiment.

It is clear that the same operation and effect as the first embodiment can be obtained with such a configuration as well.

As explained above, according to the present invention, cemented carbide,
In a method of joining a refractory welding member such as a ceramic to a mating member, an insert ring made of a material that can be fused to the mating member is joined to the refractory welding member by press-fitting, and the refractory welding with the insert ring bonded is performed. The component is assembled to the attachment part of the mating component with a brazing material interposed between both components, the insert ring and the mating component are joined by electron beam welding, and then the mating component is heated to melt the brazing material and perform difficult-fusion welding. Since the component and the mating component are brazed, the lifting of the parts during brazing is prevented and stable quality of the brazed parts can be obtained.Furthermore, the falling off of refractory welded parts can be avoided when brazing is performed at the joint. In addition, the electron beam welded insert ring also prevents the refractory welding member from peeling off and falling off.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a pelletizer die to which a cemented carbide tip is bonded using a conventional joining method, and Fig. 2 is an enlarged view of the cemented carbide tip of the pelletizer die shown in Fig. 1.
3 to 6 are diagrams sequentially showing each step of the bonding method according to the present invention, and FIGS. 7 to 10 are diagrams sequentially showing each step of the bonding method according to the second embodiment of the present invention. 11.11'...Refractory welding member, 12.12'...
・Insert ring, 13...Φ mating member, 14.14
'...Brazing material. Special AK Applicant Nikki Steel Co., Ltd. Agent Patent Attorney Toshiyuki Miyauchi No. 1
Figure 1 Figure 2 Figure 3 Figure 41! f

Claims (1)

[Claims] In a method of joining a difficult-to-weld member such as cemented carbide or ceramic to a mating member, an insert ring made of a material that can be fused to the mating member is joined to the difficult-to-weld member by press fitting. , the refractory welding member to which the insert ring has been combined is assembled to the attachment part of the mating member with a brazing material interposed between the two members, the insert ring and the mating member are joined by electron beam welding, and then the mating member The joining power of the refractory welding member is characterized by heating the brazing material to melt the brazing material and brazing the refractory welding member and the mating member! Leaving.