According to the basic characteristics of welding energy during welding, various welding methods are summarized into five categories, namely arc welding, resistance welding, special welding, gas welding and brazing. There are different testing methods and testing equipment for different types of welding equipment, and there are also differences in the mechanical and electrical performance testing items and focus of the welding power source. Arc welding and electric resistance welding are currently the most widely used welding methods. The arc welding and electric resistance welding power supply testing equipment is also the two most commonly used power detecting equipment.
1 resistance welding power supply testing equipment
The traditional resistance welding power source testing equipment is mainly a high current tester. Generally, only the welding current and the length of the energization time are detected. The detected welding current is only divided into two forms: alternating current and secondary rectified direct current. With the development of electronic and computer technology, new types of inverter-type DC, AC, square wave pulse, capacitor energy storage and other forms of resistance welding power supply emerge in an endless stream, the welding current of this type of power supply has non-sinusoidal, non-periodic, and at the same time In addition to the detection of the electrical performance parameters of the welder, the electrode pressure in the mechanical properties of the welder, the amount of electrode displacement during the welding process (parameters reflecting the welding quality), the flow rate of the cooling water, etc., are tested and the test results are formed. Reported that traditional testing equipment has been unable to meet these testing requirements.
In recent years, developed countries such as Japan and Germany have introduced multi-function resistance welding testing equipment that can be integrated with industrial control computers for informationization, welding quality control and inspection. For example, MIYACHI's MM-360A resistance welding tester can measure the welding pressure and current simultaneously during the welding process, and display the waveforms of both, and can also process the measured data with the computer; MM-730A resistance welding tester passes The displacement sensor of the anti-magnetic interference monitors the displacement of the electrode during welding, thereby indirectly controlling the generation of the weld nugget. Germany Boschrexroth inverter resistance welding and its precision control technology have been widely used in industrial production systems.
Boschrexroth is arguably the world's largest manufacturer of medium frequency resistance welding systems. Its "multi-function intermediate frequency welding controller PSI63S" (resistance welding constant power control technology and ultrasonic control technology) is not a traditional intermediate frequency controller, but integrated. Ordinary IF controller, welding monitoring controller (constant power control technology and ultrasonic control technology) and servo motion controller (pneumatic component or electronic motor) omnipotent controller, which can weld current, welding time, welding power, weld fusion The parameters of the core size, the position of the weld, the displacement of the weld, and the pressure of the weld are fully closed-loop controlled. The welding controller that controls all welding parameters in real time and simultaneously detects them is the development direction of the resistance welding control monitoring system.
2 arc welding power supply testing equipment
As with the development of resistance welding equipment, arc welding power source testing equipment has undergone different stages of development. It is divided into four stages of development based on its technical content and characteristics. Among the arc welding testing equipments in China, the most representative arc welding power source testing equipment is the test bench developed by Chengdu Electric Welding Machine Research Institute, National Electric Welding Machine Testing Center (Chengdu Electric Inspection Institute) and Chengdu Sanfang Electric Co., Ltd. .
a) The first generation of testing equipment is represented by the HHC series arc welding power supply test bench produced by Chengdu Electric Welding Machine Research Institute. The traditional transformer and shunt are used as current sensing originals, and equipped with pointer current, voltage and power stations. The table measures the current, voltage, and power of the welding power source, and uses a contactor to switch and change the magnitude of the non-inductive resistance load to simulate the arc. At present, this kind of testing equipment is still used in some welding power production plants. It has the characteristics of high precision, good reliability and stability, but it is bulky, complicated to use and maintain, single function, and low degree of automation. It is difficult to meet modern and high efficiency. Production test.
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