Arc-discharge type stud welding gun

Abstract

The invention discloses an arc-discharge type stud welding gun. According to the arc-discharge type stud welding gun, a main shaft body, a connecting block, a moving iron core, a fixed sleeve, in which a coil is arranged, and a static iron core are sequentially arranged in a cavity of a welding gun shell from front to tail, an integrated clamping head seat is arranged at the front end of the main shaft body, the moving iron core is movably arranged at the front end of the fixed sleeve, the static iron core is mounted at the rear end of the fixed sleeve, a lifting clearance is reserved between the moving iron core and the static iron core, and a return structure which can enable the arc-discharged main shaft body to return is arranged in the welding gun shell; a shaft sleeve, in which a wear-resistant bushing made from tetrafluoroethylene copper rods is arranged, is fixedly arranged in the cavity, the main shaft body is movably arranged in the wear-resistant bushing in a penetrating manner, and the connecting block is movably arranged in a telescopic adjustment cavity of the tail end of the shaft sleeve; a driving shaft arranged at the tail end of the connecting block can be inserted into a connecting hole of the front end of the moving core, an adjusting gap is formed between the connecting block and the moving iron core, and a locking structure is arranged between the driving shaft and the moving iron core. The arc-discharge type stud welding gun has the advantages that the welding quality is high, and the welding efficiency and welding pass rate can be effectively increased.

Description

technical field [0001] The invention relates to a stud welding torch, in particular to a drawn arc stud welding torch. Background technique [0002] Arc stud welding is to use the arc generated between the top of the stud and the plate to melt the top of the stud and the plate at the same time to form a molten pool, and then apply a certain pressure to the stud to quickly squeeze the stud into the molten pool to form a weld. The welding method of the joint. Arc stud welding is widely used in automotive, shipbuilding, aviation, locomotive and other industries. The current common drawn-arc stud welding torch for arc stud welding has the following structure: a torch housing with a cavity, in which a main shaft body, a connecting block, The moving iron core, the fixed sleeve with the coil and the static iron core are arranged inside, and the control circuit device that provides the working current for the main shaft body and the coil is also arranged in the welding torch shell...

AI Technical Summary

Problems solved by technology

[0003] The main disadvantages of the drawn arc stud welding gun with the above structure are: 1. Since the linear bearing is easy to wear, the gap between the linear bearing and the main shaft body will increase with the increase of the use time, so that welding is prone to occur during welding. When the main shaft slips in the worn linear bearing, it is easy to form a groove on the surface of the main shaft, and if it is serious, the main shaft and the linear bearing will be stuck; 2. During welding, Due to the fixed connection between the main shaft and the moving iron core, there will inevitably be machining errors in the stud during processing. After the lifting gap is set, when the actual length of the welding stud is slightly longer, the stud will pass through the main shaft. Compress the return spring and slide to the tail end, so that the lifting gap between the moving iron core and the static iron core becomes smaller, thereby shortening the arc striking distance during welding arc ignition, which is prone to the phenomenon that the arc cannot be struck, which greatly reduces the welding qualification rate, welding efficiency is relatively low

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