JPH0538585A - Welding method for different kinds of metallic members - Google Patents

Abstract

PURPOSE:To obtain the connection having high reliability by inserting and holding by pressing with by electrodes of a high resistance material so as to connect a low melting point metallic member like a dot to both sides of a high melting point metallic member, allowing a preheating small current to flow, and thereafter allowing a welding current to flow for a short time. CONSTITUTION:A current flows as a current IA in a welding position 4 side, and also, flows as a current IB in a continuous part 5 side, as well. In a preheating section, for a prescribed time, the current flows to an electrode 1, a plate-like terminal 3 and a bar-like terminal 2 by a small current value, heats more the electrode 1 of a high resistance material, and also, heats both, of terminals 3 and 2, as well, and contactability of these members is also improved. In this case, as for the plate-like terminal 3, the current path is long, including the continuous part 5, and by its heating, a resistance value as a whole increases. After the preheating section in which this resistance value increases enough is finished, a welding current flows and in both the terminals 2 and 3, resistance heating becomes large, and welding is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method of dissimilar metal members, and more particularly, to redundant reliability for welding a high melting point metal member and a low melting point metal member used for terminals of electric wires by a resistance welding method. Welding method with properties.

[0002]

2. Description of the Related Art The resistance welding method is widely and easily used for spot welding of steel plates. Then, in the case of terminals of electric wires such as copper material having a low melting point which is an electric conductor, a metal member made of a high resistance material such as molybdenum or tungsten is used for the electrodes because the specific resistance is low and it is difficult to use an ordinary method. In addition, a method of welding is proposed by devising such as interposing another member at the joint (see Japanese Patent Laid-Open Nos. 1-132077, 49-33844, and 60-212183). ..

Further, in the case of an electric wire terminal in which two kinds of metal members having different melting points must be used structurally, which is a proposition of the present invention, and when the terminals of both members are welded by a resistance welding method, Since the previously proposed method lacks reliability, in that case, as shown in FIG. 5, a method of using a clad material can be considered. That is, in the method, the high melting point metal terminal 51 is sandwiched between the high melting point portions 53 of the clad material terminal 52, and the electrode 55 is pressed against the low melting point portion 54 to perform welding. The structure is such that the high melting point portion 53 covers the low melting point portion 54 as the base material so as to wrap around the connecting portion 56. In the case of the AC method, the welding current supply in this case is, as shown in the welding waveform diagram of FIG. 6, the energization current value I of 2 to 30 KA, the alternating energization time t of 8 to 10 msec, and the number of used cycles of 2 1
In the case of the capacitor system, the applied voltage value V _W is 100 to 40 as shown in the welding waveform diagram of FIG. 7.
The voltage is 0 V and the application time t is 5 to 50 msec. By the above-mentioned energization, the clad material 52 can reduce the current I _B on the connecting portion side, and thus can increase the current I _A on the welding portion side, so that welding at two points can be performed without melting the connecting portion or excessive splash. It makes possible and reliable electrical connections.

[0004]

However, when the terminals of two kinds of metal members having different melting points are welded by the resistance welding method, it is necessary to use the clad material as in the conventional case. Since the base metal and the base metal must be made so as to be completely metal-bonded, the cost is inevitable, and the price is 3 to 4 times higher than that of ordinary copper-based materials, and it is impossible to supply inexpensive and inexpensive electric parts. There was a problem.

Therefore, the present invention provides a welding method having a redundant reliability capable of welding dissimilar metal members by a resistance welding method without using an expensive clad material, and having a highly reliable electrical connection. It is intended to provide and thus solve the above problems.

[0006]

In order to achieve the above-mentioned object, the present invention has a pair of rod-shaped or plate members, at least a part of which are connected to both sides of a rod-shaped or plate-shaped high-melting point metal member. The low-melting point metal member is pressed into the electrode of high resistance material so as to come into point contact at two or more locations, and after a small amount of preheating current is applied to the electrode for a predetermined time A welding current is passed for a short time to weld both members.

[0007]

The small electric current for preheating heats the electrode made of a high resistance material, the low melting point metal member and the high melting point metal member, respectively. Of these, it is particularly important that the low melting point metal member has increased resistance due to heating. Also, these heatings improve the pressure contact between the electrode and both members. When a welding current is applied in this state, the resistance of the low-melting metal member increases due to heating, so the current flowing to the connection side that is not involved in welding is reduced, and conversely, the current flowing to the welding side is decreased. Will grow. As a result, a larger amount of current flows in the welding position of the low-melting point metal member and the high-melting point metal member, and the two members are welded by the resistance heating. In this case, since there is little wasted current that is not involved in welding, the welding current can be made smaller than in the conventional case, and therefore, no fusing or excessive splash in other parts occurs.
Further, since both members are welded to two or more points, for example, the low-melting point metal member on both sides of the high-melting point metal member, even if the connection at one point is defective, it can be said to be redundant or redundant.
Since the connection of points serves to carry electricity, a high reliability of the electrical connection is ensured. In addition, inexpensive brass can be used without using an expensive clad material, and highly reliable soldering can be performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

First, a specific structure will be described with reference to FIGS.

In FIG. 1, reference numeral 1 denotes a pair of rod-shaped electrodes made of a metal or alloy such as molybdenum or tungsten, which is made of a high resistance material having a high electric resistance value. Reference numeral 2 denotes an iron-nickel (Fe-Ni) alloy, which is a terminal (hereinafter referred to as a rod-shaped terminal) formed of a high-melting metal member such as 42 alloy and formed in a rod shape. Reference numeral 3 denotes a copper-based metal or alloy (for example, brass), which is a pair of curved plate-shaped terminals (hereinafter referred to as plate-shaped terminals) which are made of a low-melting metal member and which are symmetrically opposed to each other at the protrusions. , Separated at welding position 4 and connecting part 5
It is the one connected at.

The electrodes 1, 1 of the plate-shaped terminals 3, 3 are arranged so that the rod-shaped terminal 2 of the high-melting-point metal member and the plate-shaped terminal 3 of the low-melting-point metal member are in point contact with each other at two welding positions 4. It is applied to the back surface so that the plate-shaped terminal 3 is pressed against the rod-shaped terminal 2 to apply pressure, and in that state, a welding current, which will be described later, is supplied.

FIG. 2 is a schematic view of a main part of an A / B sensor unit assembly showing a usage state of the rod-shaped terminal 2 and the plate-shaped terminal 3 described above. The rod-shaped terminal 2 guarantees the heat-resistant function of the unit 6 by using a metal member having a coefficient of thermal expansion equivalent to that of the glass for hermetically sealed glass used for encapsulating the semiconductor of the sensor unit 6.
Therefore, the above-mentioned iron-nickel alloy refractory metal member is often used as a suitable material. The detection signal of the sensor unit 6 is taken out by the rod-shaped terminal 2. Since the rod-shaped terminal 2 is a high melting point metal member, the soldering reliability for wiring connection in the substrate 7 is poor, and therefore the soldering reliability is high. A plate-like terminal 3 made of a copper-based material having a low melting point, that is, a low-melting metal member is welded to the rod-like terminal 2 to serve as an intermediary for taking out an electric signal. Therefore, the plate-like terminal 3 is formed on the long plate member 8 having the projecting portion 9 to be inserted into the board 7 on the opposite side, and is appropriately soldered to the board and other parts to perform the above-mentioned function. ing.

Next, the method of supplying the welding current will be described.

(A) In the case of the AC system, in this case, as shown in FIG. 3, when the horizontal axis represents time and the vertical axis represents the alternating current value, the current value I _P during the preheating time T is 0.1-5.0K
A low value of A, and this preheating cycle number is 5 to 2
00 cycles (the time T is determined by this). In the welding section after the end of the preheating time T, the welding current value I _W1 is set to a larger value of 2 to 30 KA, the alternating energization time t _W1 is set to 8 to 10 msec, and the number of used cycles is 2
It is a short time of about a cycle.

B) In the case of the capacitor method, in this case, as shown in FIG. 4, the section of the preheating time T has the current value I _P and the number of preheating cycles in the same range as in the AC method of (a), and the welding section it is the applied voltage value V _W2 and 100 to 400, in which the energization time t _W2 in a range of 5～50Msec.

Next, the operation of the above embodiment will be described. Figure 1
In this state, it is assumed that the electrode 1 is energized by either method of FIG. 3 or FIG. Then, the current flows as the current I _A on the welding position 4 side, and also flows on the connecting portion 5 side as the current I _B. In the preheating section, a small current value flows for a predetermined time (5 to 200 cycles) to the electrode 1, the plate-shaped terminal 3 and the rod-shaped terminal 2 to heat the electrode 1 made of a high resistance material more and Also, both terminals 3 and 2 are heated to improve the contactability of these members. At this time, the plate-like terminal 3 has a long current path including the connecting portion 5, and its resistance increases as a result of heating.

After the end of the preheating section in which the resistance value is sufficiently increased, the welding current flows, the resistance heating of both terminals 2 and 3 becomes large, and the welding is completed. In this case, since the plate-like terminals 3 are low-melting metal member has a high resistance, not involved in the welding of the connecting portion 5, requires less wasteful current I _B, which only the welding side current I _A You can do a lot. Therefore, the absolute value of the welding current may be smaller than that of the conventional one, whereby the disadvantage of fusing or excessive splash at the connecting portion 5 of the low melting point metal member can be prevented, and the high melting point can be prevented. This enables appropriate resistance welding of a metal member and a low melting point metal member.

In the above embodiment, since there are two welding positions 4 for the terminals 2 and 3, even if one position is defective, another position is redundant or redundant. The electrical and mechanical connection is maintained, ensuring a high degree of reliability of the connection. As a result, an inexpensive terminal such as brass can be welded to the Fe-Ni alloy terminal without using an expensive clad material, and highly reliable connection with the Fe-Ni alloy and high reliability with the substrate or the like. Both of the soldered connections can be made at once, and the welding method with redundant reliability can be provided.

Although the high melting point metal member is a rod-shaped terminal and the low melting point metal member is a plate-shaped terminal in the above embodiment, the present invention is not limited thereto.
Also, the welding positions are not limited to two, and may be more.

[0020]

As described above, according to the present invention, redundant reliability that enables welding of a high melting point metal member and an inexpensive low melting point metal member without using an expensive clad material is provided. It is possible to provide a welding method having the above, and it is possible to obtain an effect that both the connection by highly reliable resistance welding and the connection by similarly highly reliable soldering can be performed.

[Brief description of drawings]

FIG. 1 is a front view showing a resistance welding state between terminals showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of the A / B sensor assembly showing a usage state of the terminal of FIG.

FIG. 3 is a welding waveform diagram of an AC method of the current supply methods used in the present invention.

FIG. 4 is a welding waveform diagram of the same capacitor method.

FIG. 5 is a front view showing a resistance welding state between terminals when a conventional clad material is used.

FIG. 6 is a conventional AC type welding waveform diagram.

FIG. 7 is a conventional capacitor type welding waveform diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrode 2 High melting point metal member (rod terminal) 3 Low melting point metal member (plate terminal) 4 Welding position 5 Connecting part 6 Unit 7 Board 8 Long plate member 9 Projecting part

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[Procedure amendment]

[Submission date] November 15, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Further, in the case of an electric wire terminal in which two kinds of metal members having different melting points must be used structurally, which is a proposition of the present invention, and when the terminals of both members are welded by a resistance welding method, Since the previously proposed method lacks reliability, in that case, as shown in FIG. 5, a method of using a clad material can be considered. That is, in the method, the high melting point metal terminal 51 is sandwiched between the high melting point portions 53 of the clad material terminal 52, and the electrode 55 is pressed against the low melting point portion 54 to perform welding. The structure is such that the high melting point portion 53 covers the low melting point portion 54 as the base material so as to wrap around the connecting portion 56. In the case of the AC method, the welding current supply in this case is, as shown in the welding waveform diagram of FIG. 6, the energization current value I of 2 to 30 KA, the alternating energization time t of 8 to 10 msec, and the number of used cycles of 2 1
In the case of the capacitor system, the applied voltage value V _W is 100 to 40 as shown in the welding waveform diagram of FIG. 7.
The voltage is 0 V and the application time t is 5 to 50 msec. The above-mentioned energization enables welding at two points and makes it possible to obtain a reliable electrical connection.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

However [0007], when welding terminal having a melting point of two different metal member by resistance welding method, as in the prior art, the use of cladding material, throat <br/> bovine However, there is a problem that it becomes expensive and it is impossible to supply inexpensive and inexpensive electric parts such as ordinary copper-based materials.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

The small electric current for preheating heats the electrode made of a high resistance material, the low melting point metal member and the high melting point metal member, respectively. Of these, it is particularly important that the low melting point metal member has increased resistance due to heating. Also, these heatings improve the pressure contact between the electrode and both members. When a welding current is applied in this state, the resistance of the low-melting-point metal member increases due to heating, so the current flowing to the connection side that is not involved in welding is reduced, and conversely, the current flowing to the welding side is reduced. Will grow. As a result, a larger amount of current flows in the welding position of the low-melting point metal member and the high-melting point metal member, and the two members are welded by the resistance heating. In this case, since there is little wasted current that is not involved in welding, the welding current can be made smaller than in the conventional case, and therefore, no fusing or excessive splash in other parts occurs.
Further, since both members are welded to two or more points, for example, the low-melting point metal member on both sides of the high-melting point metal member, even if the connection at one point is defective, it can be said that it is redundant or redundant.
Since the connection of points serves to carry electricity, a high reliability of the electrical connection is ensured. Moreover, an inexpensive copper-based material such as brass can be used without using an expensive clad material, and highly reliable soldering can be performed.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

In FIG. 1, reference numeral 1 denotes a pair of rod-shaped electrodes made of a metal or alloy such as molybdenum or tungsten, which is made of a high resistance material having a high electric resistance value. Reference numeral 2 denotes an iron-nickel (Fe-Ni) alloy, which is a terminal (hereinafter referred to as a rod-shaped terminal) formed of a high-melting metal member such as 42 alloy and formed in a rod shape. Reference numeral 3 denotes a copper-based material (for example, brass), which is a pair of curved plate-shaped terminals (hereinafter referred to as plate-shaped terminals), which are formed of a low-melting metal member and are symmetrically opposed to each other at the protrusions, and are welded to each other It is separated at 4 and is connected at the connecting part 5.

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 6]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 8]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Kato 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Yazaki Parts Co., Ltd.

Claims (1)

[Claims] 1. A pair of rod-shaped or plate-shaped low-melting metal members which are connected at least partially to both sides of a rod-shaped or plate-shaped high-melting-point metal member, and which are opposed to each other at two or more positions. To make a point-like contact, the electrode made of high-resistance material was pressed into the electrode, and after a small amount of preheating current was applied to the electrode for a predetermined time, a welding current was applied for a short time to weld the two members together. Welding method for dissimilar metal members.