Electric resistance welding method, electrode welding head using electric resistance welding method and electrode welding head used in electric resistance welding method

Abstract

The invention discloses an electric resistance welding method, an electrode welding head using the electric resistance welding method and the electrode welding head used in the electric resistance welding method. The electric resistance welding method includes the steps that welding parts to be welded are connected together in a lap joint and a vertically intersected overlaying or overlapping mode, then two electrodes are pressed on a welding part on the top layer in advance in the same direction to form a current loop, pressurizing pieces are arranged between the two electrodes and on the same side as the electrodes, wherein the pressurizing pieces are parallel to the electrodes and can vertically move to press the welding part on the top layer, and in the process of welding, the electric resistance welding method includes the following steps that (1) a power supply of a welding machine is switched on, (2) current generates resistance heat in the welding part on the top layer, and the welding part on the top layer is heated to a fusion or plastic state, (3) the pressurizing pieces pressurize the welding part on the top layer, (4) cooling crystallization is conducted, (5) pressure of the pressurizing pieces and the two electrodes is released, and then the welding parts are taken out. By the adoption of the electric resistance welding method, any metal wire or wire or wire piece or piece in a lap joint state can be welded, the electric resistance welding method is especially used for welding IC card chips and induction coils of the IC card chips and directly welding battery electrodes and copper pieces or copper wires in battery sets and can achieve the good effect.

Description

technical field [0001] The invention relates to a resistance welding method and a used welding head, in particular to a resistance welding method and an electrode welding head in which two electrodes are arranged in parallel in the same direction. Background technique [0002] Resistance welding is to combine the workpieces, apply pressure to different weldments to be welded through two electrodes, and heat them to a molten or plastic state by using the resistance heating effect generated by the current flowing through the contact surface between the weldments to be welded and the adjacent area , so that it forms a method of metal bonding. [0003] There are two main methods of resistance welding commonly used, namely spot welding and seam welding. [0004] spot welding [0005] Such as figure 1 As shown, spot welding is a resistance welding method in which weldments are assembled into lap joints and pressed between two columnar electrodes 1 to melt the base metal by resi...

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Problems solved by technology

[0012] 1) There are certain requirements for the resistance value of the top weldment 3 and the bottom weldment 4, that is, the resistance value of the bottom weldment 4 is much smaller than the resistance value of the top weldment 3, so its scope of application is limited

[0013] 2) When the resistance value of the top weldment 3 is much smaller than the resistance value of the bottom weldment 4, the welding current will be short-circuited by the top weldment 3, and the current will not pass through the bottom weldment 4. Therefore, the top weldment 3 and the bottom weldment cannot be connected 4 welded together

Moreover, the welding current passes through the top-layer weldment 3, and under the action of resistance heat, it is very easy to fuse the top-layer weldment 3 between the two electrodes 1.

[0014] 3) For the state where the top weldment 3 and the bottom weldment 4 are intersected, the balanced gap resistance welding cannot be used

Because, when the two electrodes 1 exert pressure on the top weldment 3, the bottom weldment 4 between the two electrodes 1 under the top weldment 3 cannot make the welding current form a current loop. Therefore, the top weldment 3 Solder joints 51 cannot be formed with the bottom weldment 4

In addition, in this state, since the two electrodes 1 exert pressure on the top-layer weldment 3 in the same direction, it is also very easy to cause the top-layer weldment 3 between the two electrodes 1 to arch up and cannot be in close contact with the bottom-layer weldment 4

[0015] 4) It cannot be applied to the welding process of the non-contact or dual-interface IC card 6, nor can it be applied to the welding process of the battery 7 electrode 1 and the external lead wire in the battery 7 management system

Its disadvantages are, first, the intermediate transitional welding sheet——nickel sheet or other metal sheet is added, so the material cost is increased; second, because the conductivity of nickel is worse than that of copper, the welding structure is greatly reduced. The output current of the battery pack

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