JPS61119373A - Joining method of magnesium alloy - Google Patents

Abstract

PURPOSE:To adopt a joint structure with respect to an Mg alloy by forming a covered layer by executing thermal spraying of a metal whose joining property is excellent, to a joint object part of the Mg alloy, and executing a junction of the Mg alloy by using this covered layer as a brazing material. CONSTITUTION:An Al thermal spraying layer 3 is formed on a brazing object part 2 of a plate-shaped Mg alloy 1, and simultaneously, an Al thermal spraying layer 6 is formed on a groove-shaped brazing object part 5 of an Mg alloy 4 joined to the alloy 1, too. In this case, the thickness t1 of the alloy 1 is formed to a size which can be fitted into a groove width t2 of the object part 5, and subsequently, brazing is executed in a state that a part of the thermal spraying layer 3 of the alloy 1 has been fitted into a part of the thermal spraying layer 6 of the alloy 4. In this way, the junction of the Mg alloy can be executed easily, and the joint structure can be adopted with respect to the Mg alloy.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for joining magnesium alloys.

[Conventional technology]

Magnesium alloys have traditionally been considered extremely difficult to join by soldering or brazing.

On the other hand, demand for magnesium alloys has been increasing in recent years because they have a lower specific gravity than other metals and are superior in terms of machinability, specific strength, vibration damping properties, etc.

Generally, when manufacturing structures using metal, casting and cutting are often used alone or in combination, but there are cases where casting cannot be used due to production volume, or cutting alone is not enough to achieve the desired shape. In many cases, it is not possible to fabricate such a structure, and joining methods such as soldering or brazing must be used.

Conventionally, when manufacturing structures using magnesium alloys, soldering and brazing are extremely difficult, so it has been extremely difficult to manufacture structures using these methods.

In such cases, the use of magnesium alloy was often abandoned and an alternative material such as aluminum was used for brazing. However, aluminum has a higher specific gravity than magnesium alloy. , If you want to reduce the weight as much as possible, you may have to use an unreasonably thin structure, so the strength is weak (
There were drawbacks such as: Also, for strength, brass,
If you use iron, stainless steel, etc., the weight will increase even more.
It had the disadvantage of failing to meet the five objectives of reducing weight.

On the other hand, from the point of view of machinability, iron, stainless steel, etc. are several times to 10 times that of magnesium alloys.
It has the disadvantage of high cutting resistance.

[Problem that the invention seeks to solve]

The present invention provides a method for joining magnesium alloys, which was conventionally difficult to join by brazing, etc., and makes it possible to manufacture magnesium alloy structures with a joining structure that was conventionally difficult to manufacture.

[Means for solving problems]

The means of the present invention for solving the above-mentioned problems is to thermally spray a metal with excellent bonding properties onto the part of the magnesium alloy to be bonded, and use the metal coating formed by the thermal spraying as a brazing material for bonding. This is a method for joining alloys.

〔Example〕

Next, the present invention will be described by way of examples with reference to the drawings.

First, as shown in FIG. 1, an aluminum sprayed layer 3 is formed on a portion 2 of a plate-shaped magnesium alloy 1 to be brazed. Next, an aluminum sprayed layer 6 is formed on the groove-shaped filter 5 target portion 5 of the magnesium alloy 4 to be joined to the transfer alloy 1. In this case, the thickness t of the magnesium alloy 1, the groove width t of the part 5 to be brazed, and the width t in which the VC can be inserted are determined. Further, as shown in FIG. 3, the thermally sprayed layer 3 of the magnesium alloy 1 in the shape of a busy plate is fitted into the thermally sprayed layer 6 of the magnesium alloy 4, and brazed in this state.

The metal to be sprayed on the sprayed layers 3 and 6 is a metal with excellent bonding properties.

〔Effect of the invention〕

As explained above, according to the present invention, joining of magnesium, which has been considered extremely difficult in the past, can be easily performed. As a result, it is possible to adopt a joint structure for magnesium alloys, and even if there are complex shapes, it is possible to create a structure in which multiple parts can be easily divided and joined, and the purpose of weight reduction can be fully achieved. I can do it. In addition, it is advantageous compared to other metals in terms of specific strength, and has a significant effect of reducing machining man-hours by reducing cutting resistance.

[Brief explanation of drawings]

Figure 1 is a side view of a plate-shaped magnesium alloy used in the present invention, Figure 2 is a side view of a magnesium alloy with grooves used in the present invention, and Figure 3 is a side view of a magnesium alloy joined according to the present invention. It is. l... Plate-shaped magnesium alloy 2... Brazing target part 3... Aluminum sprayed layer 4... Magnesium alloy with grooves 5... Brazing target part 6... Aluminum sprayed layer

Claims (1)

[Claims] A method for joining magnesium alloys, characterized by spraying a metal with excellent joinability onto the parts of the magnesium alloy to be joined, and using the metal coating formed by the spraying as a brazing material for joining.