Electric capacity energy storage direct discharge type movable nut welding machine and its special welding gun and technology

Abstract

A direct discharge type movable nut welder with energy storing capacitor features that a power input controller is installed in its casing, the coil for the main charging circuit is a group of windings to supply an AC voltage (20-80 V) to the main charging circuit, and a dedicated welding gun is disclosed. Its advantages are high welding efficiency and no deformation of workpiece to be welded.

Description

Technical field [0001] The invention relates to a special welding gun for nut welding and a welding process method thereof. Background technique [0002] In the current international general sheet metal processing process, when many workpieces are processed at the same time, because the workpieces are large, or the geometric shapes are more complicated, and the plates are thin, nut welding must be carried out when various connecting parts are fixed by bolts. . This welding method is to pre-make the positioning hole for the nut welding on the workpiece to be welded, and there is a positioning guide post on the welding lower arm. During welding, the welding workpiece is penetrated into the positioning guide pillar, and the welding nut is penetrated into the positioning guide pillar. One type of positioning method is reverse positioning. This type of reverse positioning needs to move the welded workpiece as a whole during welding and penetrate the positioning guide posts one by one....

AI Technical Summary

Problems solved by technology

Therefore, the work intensity is high and the efficiency is low. Because the power of the welding machine is large, the energy consumption is large, and it is easy to have an impact on the power grid.

This kind of welding can adopt a variety of welding methods, such as welding with a precisely controlled spot-projection welding machine. Because the welding arm of the spot-projection welding machine is short, it is impossible to perform large-span nut welding. If the geometry of the welding part is more complicated, it is This kind of welding forbidden area, such as the automobile manufacturing industry, after the assembly and welding of the whole vehicle is completed, this kind of spot nut welding machine will not be able to perform nut welding on the welding station inside the car

In addition, this type of welding requires high pressure and relatively large welding current, so it is very easy to deform the internal thread of the welding nut, resulting in welding failure. Because the spot projection welding machine adopts the reverse fixed welding method, during the welding process, due to the nut The positioning boss is in contact with the inner wall of the welding hole pre-made by the workpiece, so that the contact resistance between the positioning bump of the welding nut and the inner hole wall of the welding hole on the welding workpiece is extremely small, and the welding current will also be generated during the welding process. Shunt phenomenon, because there is no arc drawing process in the welding method, the whole welding process is to directly melt the welding bump of the welding nut at a large current to form molten metal, which will have a serious impact on the shunting of the welding current. The larger the diameter of the welding nut Larger, the greater the effect

[0003] In order to shorten the welding time, reduce the heat-affected area, and prevent the deformation of the back of the welding workpiece, the current maximum charging voltage provided by the capacitor energy storage direct discharge welding machine is between 180V and 220V. The positioning bump of this welding nut and the welding workpiece The contact resistance of the inner wall of the welding hole is extremely small, and the welding current shunt phenomenon will also occur during the welding process. The higher the welding voltage, the more serious the shunt phenomenon

[0004] If ordinary manual arc welding machine is used for welding, the welding efficiency is extremely low, and the shape is not beautiful, especially when welding nuts with small geometric dimensions, it is easy to burn the internal thread. When welding nuts below M4, this kind of manual arc welding machine, it will not be able to weld normally, and there will be a huge waste of energy

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