Safety operation procedures for spot welding machines:
1. Before operation, the oil stain of the upper and lower electrodes should be removed. After power-on, the body shell should be free of leakage.
2. Before starting, the steering switch of the control line and the small switch of welding current should be connected, the number of poles should be adjusted, and then the water source and gas source should be connected, and finally the power supply should be connected.
3. After the welding machine is energized, check whether there is leakage in the electrical equipment, operation organization, cooling system, gas circuit system and body shell.
Spot welding machines are divided into all-round (general-purpose) and special-purpose types according to their uses. According to the number of solder joints welded together, there are single-point type, double-point type, and multi-point type. According to the transmission method of the pressurized organization, there are foot pedal type, motor-cam type, pneumatic type, hydraulic type, compound type (gas-hydraulic type), etc.
The principle of spot welding machine:
After the weldments are combined, the ultrasonic spot welding machine is a solid-phase welding method that applies pressure through electrodes, and the connection between the weldments is completed by the high-frequency elastic oscillation of the acoustic system and the clamping action of the static will between the workpieces. In the meantime, the ultrasonic generator is a frequency conversion device, which changes the common frequency current into the vibration current of the ultrasonic frequency, and the transducer relies on the "piezoelectric effect" to convert the ultrasonic frequency electrical energy fed into the generator into mechanical oscillation energy. The concentrator is used to amplify the amplitude and couple the load, and the weldment is under the joint action of static pressure and elastic oscillation energy, the elastic oscillation energy is converted into conflict energy, deformation energy and thermal energy between the workpieces, so that the two workpieces form a layer of surface oxide film, so as to achieve conflict welding. When different metal materials are welded, a hybrid molecular interface is formed, resulting in metallurgical welding.
Advantages and advantages of spot welding machine:
(1) It is an internal heat source during welding - the heat of the spot welding machine is very concentrated, the heating time is short, and a plastic ring is formed around the solder joint, so the metallurgical process is simple, the heat affected zone is small, the deformation is small, and the quality of the joint is easy to be guaranteed.
(2) Compared with traditional riveting - light weight, simplified structure, easy to obtain messy shape parts, save materials, improve the bearing function of the structure, reduce power consumption, and improve the operation speed.
(3) The productivity of the intermediate frequency spot welding machine is high - it is easy to complete mechanization and automation, improve the condition of the workpiece, and save more than 5/6 of man-hours compared with riveting.
(4) The appearance quality of the solder joints of equipment such as medium frequency spot welding machine and frequency conversion spot welding machine is good - especially easy to ensure the air tightness of parts.
Disadvantages and disadvantages of resistance spot welding machine, intermediate frequency inverter spot welding machine, frequency conversion spot welding machine, inverter intermediate frequency spot welding machine (some problems that still exist now):
(1) In terms of control quality, there is no simple and reliable non-destructive testing method to accurately judge the quality of the welding joints of the spot welding machine. Now, the method of beating and tearing the test piece is mostly used.
(2) Medium frequency spot welding machine equipment is messy, high power, investment, difficult repair - due to the low output voltage (a few volts - more than ten volts), the current is large (more than tens of kiloamperes), so the power supply power is required (some up to more than 1000 thousand volt amperes), the power grid bears difficulties, and general resistance welding requires special transformer power supply.
(3) The scale, shape and thickness of the weldment of the intermediate frequency spot welding machine are limited by the equipment - the material, scale, thickness and shape of the weldment are limited by the power of the welding machine, the size of the arm and the shape of the welding machine structure.
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