JP2554311B2 - Welding method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for reliably welding a copper material and a stainless steel material in a simple and short time, and particularly to a cooking container such as a pot or kettle for an electromagnetic cooker. The present invention relates to a welding method that can be effectively applied in manufacturing.

[0002]

2. Description of the Related Art For example, in the production of pots and kettles, the body is made of copper and the bottom is made of stainless steel, and these are welded by gas welding. In this welding, generally, the tip of a welding torch is directly directed to the portion to be joined between the body and the bottom, and heating is performed at an appropriate interval to melt the joining lines of the mutual metals and perform welding. It is carried out by an argon torch using argon gas as an inert gas.

[0003]

The welding method for such pots is welding of different kinds of metals, and since the melting temperatures of the metals are different depending on the materials, it is difficult for the welding to be performed by a person without considerable skill. The strength of the welded part is not always good, and cracks occur at the welded part, which causes leakage. In addition, since the copper material has a lower melting point than the stainless steel material but has a high thermal conductivity, heat is dispersed in all directions by heating, and it takes a long time to melt the joint. The inventor of the present invention has completed the welding method of the present invention as a result of earnestly studying to solve such a problem in manufacturing pots.

[0004]

That is, according to the present invention, in welding a copper material and a stainless steel material, an argon torch is used to join the copper material and the stainless steel material to each other. On the other hand, the welding method is characterized in that the tip end portion of the argon torch is biased to the copper material side and is welded.

In another invention, in welding a copper material and a stainless steel material, a contact plate made of a preheated copper material is used as a joining line on the back surface of the copper material and the stainless steel material. The portion of the joining line is heated by abutting over it, and using an argon torch from the surface, the portion of the copper material and the stainless steel material is joined to the portion to be joined to the argon material. The welding method is characterized in that the tip portion of the chi is biased to the copper material side and then welded.

In the welding by the argon torch in these inventions, it is desirable that the projection area of the flame of the argon torch is close to the copper material side with respect to the portion where the copper material and the stainless steel material are to be joined. The tip portion of the argon torch is biased so as to be approximately 2/3 and approximately 1/3 toward the stainless steel material side.

This welding method can be applied to the mutual welding of the body and the bottom of the cooking container in which the body of the body is made of copper and the bottom is made of stainless steel.

[0008]

The welding method according to the present invention is applied to the copper material and the stainless steel.
Considering the difference in the melting time of the parts to be joined between the stainless steel material and the copper material when welding a stainless steel (hereinafter stainless steel is simply referred to as stainless steel) material, the weight of heating with an argon torch is set to be higher than that of the stainless steel material. Is also applied to the copper material side, and by this heating, the melting time of the portion where the copper material and the stainless steel material are to be joined is made coincident. This is the portion where the tip of the argon torch is to be joined to the copper material and the stainless steel material It is achieved by biasing the copper material toward the copper material side.

The deviation of the above-mentioned argon torch is, specifically, that the projection area of the flame of the argon torch is approximately 2/3 stainless steel on the copper material side with respect to the joining line between the copper material and the stainless steel material. On the material side, the argon gas is reduced to approximately 1/3.
This can be done by displacing the tip of the chi.

In this case, the melting point of the copper material is lower than that of the stainless steel material, but the thermal conductivity thereof is higher than that of the stainless steel material, so that heat due to heating is rapidly propagated in all directions to raise the bonding line up to the melting temperature. It takes time to do so. Therefore, the projection area of the argon torch frame is biased to the copper material side,
The amount of heat generated by heating is given to the copper material in a relatively wide range to rapidly raise the temperature of the joining line, while the stainless steel material, which has a lower thermal conductivity and a higher melting point than the copper material, has a biased and relatively narrow projection. The temperature is slowly raised by heating the area to melt the parts to be joined at the same time, and this melting enables strong and reliable welding in a short time.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described more specifically below with reference to the accompanying drawings. FIG. 1 is an explanatory view of the case where the welding method of the present invention is applied to the production of a pot body 1. The pot body 1 is made by joining a cylindrical body portion 2 and a dish-shaped bottom portion 3 and a body portion 2 is formed. Is made of copper, and the bottom portion 3 is made of stainless steel and is obtained by pressing and other predetermined forming processes.

The body portion 2 and the bottom portion 3 are heated through an argon torch 5 for abutting the edges to be joined to each other and introducing the joining line 4 by introducing the argon gas from the cylinder 7 and projecting it. It is welded by melting. As shown in FIG. 2, the position of the tip portion 6 of the argon torch 5 used for this is such that the projection area 8 of the frame is such that the body portion 2 made of copper material and the bottom portion 3 made of stainless steel material are joined. In this embodiment, the tip portion 6 has a diameter of 2 mm and is biased so that it is approximately 2/3 on the copper material side and approximately 1/3 on the stainless steel material side with respect to the power portion. Argon-
The axis of the chi 5 is biased by 2 mm toward the body 2 and held. Further, the tip portion 6 of the argon torch 5 maintains a distance of 1 to 2 from the outer surface of the body portion 2 while maintaining such a distance.
It is held in mm and welded.

By this operation, the frame projected from the tip portion 6 of the argon torch having a diameter of 2 mm expands the projection area (projection area) 8 to 3 to 4 mm, and the frame 2 of the copper material is expanded. About 2/3 of the projection area 8 and about 1/3 of the projection area of the bottom 3 made of stainless steel are heated. By this heating, by heating a wide range of the copper material having a low melting point and high thermal conductivity, the temperature of the bonding line 4 rapidly rises even when the heat quantity is dispersed, while the melting point is high. The stainless steel material having a low thermal conductivity can be heated comparatively slowly to cause the joining line 4 to reach the corresponding melting point at the same time to be heat-melted, so that the body portion 2 and the bottom portion 3 are short at the joining line 4. It can be surely welded and firmly bonded in time.

Here, in the above welding, as shown in FIG. 3, a contact plate 9 made of a copper plate having good heat conductivity is used for the back surfaces of the body 2 and the bottom 3, and this contact plate is preheated. And abutting so as to straddle the joining line 4 on the back surface of the joining line 4 and holding and welding the tip portion 6 of the argon torch 5 to the body portion 2 side in the same manner as described above, the body portion 2 and the bottom portion 3 are joined. It can be quickly melted at the same time.

In the pots thus obtained, the joining line 4 is firmly integrated so that there is no leakage due to use, and
The appearance of the welded part is also excellent. In particular, since the bottom part is made of stainless steel, it has excellent durability against heating, and the copper material that forms the body part has excellent thermal conductivity, which is advantageous for cooking and cooking. It has extremely high usefulness.

[0016]

The welding method of the present invention utilizes the fact that the melting point of the copper material is higher than that of the stainless material and that the copper material is heated faster than the stainless material due to the difference in thermal conductivity.
The projection area of the argon torch is biased to the copper material side for heating, and by this, the melting of the copper material and the melting of the stainless material can be made coincident with each other, and the welding can be carried out quickly and reliably.

Specifically, the projection area of the argon torch frame is biased so that it is approximately 2/3 on the copper material side and approximately 1/3 on the stainless steel material side with respect to the joining line. By doing so, it is possible to correct the uncertainty of the conventional welding of the copper material and the stainless steel material by argon welding and perform welding with high strength and durability.

Further, in this welding, a more reliable welding can be performed by abutting a contact plate made of a copper material which has been heated in advance over the joining line on the back surface of the copper material and the stainless steel material and welding the same. It is possible.

Such a welding method is excellent in that it can be applied to mutual welding of dissimilar metals in cooking containers such as pots and kettles, in particular, containers for electromagnetic cookers, and enables efficient production. .

[Brief description of drawings]

FIG. 1 is an explanatory diagram when an example of a welding method of the present invention is applied to manufacturing a pan.

FIG. 2 is a front view showing a projection area of an argon torch frame in the welding method of the present invention.

FIG. 3 is a partial vertical cross-sectional view in which another example of the welding method of the present invention is applied to manufacture a pan.

[Explanation of symbols]

 1 Pan main body 2 Body part 3 Bottom part 4 Bonding line 5 Argon torch 6 Tip part 7 Cylinder 8 Frame projection area 9 This plate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // B23K 103: 22

Claims (4)

(57) [Claims] 1. In welding a copper material and a stainless steel material, an argon torch is used, and a tip portion of the argon torch is connected to a portion where the copper material and the stainless steel material are to be joined. Welding method, characterized in that the steel is biased to the copper material side and then welded. 2. In welding of a copper material and a stainless steel material, a contact plate made of a preheated copper material is brought into contact with a joining line on the back surface of the copper material and the stainless steel material. The joint line is heated by using an argon torch from the surface, and the copper material and stainless steel
A welding method, characterized in that a tip portion of the argon torch is biased to the copper material side and welded to the portion to be joined with the base material. 3. In the welding using the argon torch, the projection area of the flame of the argon torch is generally located on the copper material side with respect to the portion where the copper material and the stainless steel material are to be joined.
3. The welding method according to claim 1 or 2, wherein the tip portion of the argon torch is biased so that it is approximately 1/3 toward the stainless steel material side. 4. The welding method according to claim 1, wherein the body of the main body is made of copper,
The welding method according to any one of claims 1 to 3, which is applied to mutual welding of the body portion and the bottom portion of a cooking container whose bottom portion is formed of a stainless steel material.