Stepping electric arc stud welding gun

Abstract

The invention is a step arc stud welding gun, including frame and step machine, where there is leading screw fixed on the shaft of the step machine, the leaking screw is connected with a driving nut, the driving nut is fix together with a guide plate, and there is a clamp set at the bottom end of the driving nut. Before welding, use the welding gun to clamp the stud to place it on the workpiece surface, start up the step machine to make the driving nut to drive the clamp so as to lift the stud, at the same time, switch on the welding power supply to induce arc; when welding, make the driving nut to drive the clamp to move down so as to send the stud to the melting tank, and terminate the welding current to form welding joint. It uses step machine as power control unit so as to be able to more accurately set lift height, down feeding depth, and lift and down feeding speed for the stud, and by sampling the arc length, can implement the adjustment of are length.

Description

technical field [0001] The invention belongs to arc stud welding equipment in the field of welding technology, in particular to a step-time arc stud welding torch. Background technique [0002] Arc stud welding is a method of arc welding. During the welding process, the contacting surfaces of the stud and weldment are heated and melted by the electric arc ignited between them, and then pressed together rapidly to form the weld. The welding process can be roughly divided into five steps: 1) The welding torch clamps the stud and places it on the workpiece, and at the same time applies preload to the stud; 2) At this moment, the switch of the stud welding torch is pulled, and the electromagnetic coil in the welding torch is energized to lift stud, at the same time the welding power is turned on, and the arc is struck between the stud and the workpiece; 3) At the lifting position, the arc extends to the entire end face of the stud, and the end face of the stud is partially melt...

AI Technical Summary

Problems solved by technology

However, considering the welding parameter setting and welding process control, there are some shortcomings in the traditional arc stud welding torch: 1) The spring preload distance and the stud lifting height before welding are adjusted by the mechanical structure of the welding torch, and the fixed iron core of the welding torch is usually adjusted For manual adjustment, it is difficult to realize the automation of welding torch operation, and at the same time, it is easy to produce large random errors when the adjustment structure accuracy is not high

However, the size of the gap between the profiled plate and the steel structure is different, and it cannot be accurately measured, which will affect the process before welding.

In the actual welding process, it is very likely that the arc length will change drastically after the profiled plate burns through, resulting in insufficient input energy. At the same time, the change in the gap may make the stud lowering depth insufficient, which will lead to a decrease in welding quality

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