How to detect the failure of spot welder 1. The spot welder does not work when stepping on the foot pedal, and the power indicator light does not light up: (1) check whether the power voltage is normal; check whether the control system is normal. (2) check whether the foot switch contact, exchange warfighter contact and split shift switch can fight well or burn.　

　

The controller of resistance welding machine is to control, monitor and test the welding process. According to the continuous improvement of automobile assembly and welding process requirements of automobile manufacturing enterprises, in order to meet the market needs. A new generation of controller has been developed. This controller has the characteristics of multi pulse trigger, multiple welding specifications, multiple starting modes, multiple field data monitoring, accurate control time, small welding current error and stable operation. It is an ideal control equipment for resistance welding medium frequency spot welding machine.　

In practical application, a piece of copper plate (copper or brass) is often placed on the workbench. The operator holds a welding gun and presses the switch to release the current at the position to be welded. As the heat dissipation effect of the large plate electrode is good, the back welding point is not easy to see, so the so-called single-sided point is formed. Now the platform medium frequency spot welder is also born out of this kind of welding Way.　

The length of single weld completed in unit time is called welding speed. The speed of welding depends on the welding current. High welding current can improve the welding speed, but do not mistakenly think that the welding production efficiency depends on the welding speed; not the higher the welding speed, the higher the welding production efficiency, but the welding current determines the welding production efficiency. The higher the welding current is, the more the amount of molten metal per unit time is, the higher the welding efficiency is. Under a certain welding current, the welding speed affects the thickness of the weld bead. If the welding speed is large, the weld bead will be thin; if the welding speed is small, the weld bead will be thick.　

When the suspension spot welding machine is welded, first place the workpiece between the electrode of the welding tongs, then press the welding switch, the "pressurization" program section starts, the electromagnetic valve acts, the compressed air enters the cylinder of the welding machine, the electrode of the welding tongs acts, the workpiece is compressed, after a proper delay, the "welding" program section starts, at this time, the primary coil of the welding transformer is connected to the power supply through the control of the silicon controlled rectifier The welding current is generated in the secondary stage, and the workpiece is welded. After the end of the welding procedure section, the primary coil of the transformer is powered off, and the welding machine enters the "maintain" procedure. After the pressure is maintained for a period of time, the electromagnetic valve is disconnected, the welding tongs release the workpiece, and the welding machine enters the "stop" procedure. A welding cycle has been completed.　

Visual inspection: through visual inspection, the surface trace of the workpiece is too large, the gap at the welding lap is too large, and whether there are splashing burrs and cracks at the welding points. Destructive test: mostly adopt the method of test piece - take the same material with the thickness and material of the workpiece to weld, and carry out shearing, stretching or peeling test after welding, to judge whether the workpiece can meet the required performance requirements based on the test performance of the test piece.　

The spot welding machine for steel plate is an automatic production line that completes the cross welding of round steel and twisted square steel in the welding production line. It is a large-scale welding equipment that integrates electric control, resistance welding, hydraulic pressure and machinery. It has the advantages of high automation, high load-bearing, durable, convenient maintenance, high strength density, etc. in the production, it is in accordance with the needs of customers, and the welding seam is full and even during the processing, It is not allowed to have broken welding or missing welding. The internal circulating water has the function of automatic reminder, such as high water temperature, water shortage, etc. because it involves the welding quality problems, it needs to be accurately processed, and it also avoids that the size is not suitable during installation.