Working principle of Pipe welding machine

1. Arc welding Pipe welding machine:
Working process: Arc welding Pipe welding machine uses the high temperature generated by arc discharge to melt the welding rod and weldment to form a weld. First, connect the output end of the welding power supply to the welding gun and the weldment to form an arc between the electrode of the welding gun and the weldment. The welding power supply provides stable current and voltage to maintain the stable burning of the arc. When the high temperature generated by the arc melts the metal materials of the weldment and the welding rod, the liquid metal fills into the joint gap of the weldment under the action of gravity, arc force, etc., and forms a strong weld after cooling and solidification.
Principle characteristics: The advantages of arc welding are simple equipment, flexible operation, suitable for welding of various metal materials, and high welding strength. However, more smoke and arc light will be generated during arc welding, which will have a certain impact on the health of the operator, and the welding speed is relatively slow, and the welding quality is greatly affected by the technical level of the operator.
2. Laser welding Pipe welding machine:
Working process: The laser welding machine generates a high-energy laser beam through a laser generator. The laser beam is focused on the welding part of the pipe, causing the surface of the material to melt and vaporize instantly, forming a small hole. In and around the small hole, the molten metal forms liquid metal, which is filled into the joint gap under the action of gravity, surface tension, etc., and forms a weld after cooling and solidification. The laser welding process usually requires the use of protective gases, such as argon and nitrogen, to prevent the molten pool from oxidizing.
Principle and characteristics: Laser welding has the advantages of fast welding speed, high welding precision, small heat-affected zone, and beautiful weld. It is suitable for pipe welding with high welding quality requirements, such as pipe welding in precision instruments, aerospace and other fields. However, laser welding equipment is expensive and requires high assembly accuracy of welded parts.
3. Resistance welding Pipe welding machine:
Working process: Resistance welding is to apply pressure to the welding part of the pipe through electrodes, and pass current, and use the heat generated by the resistance of the weldment itself to melt the metal material, thereby forming a weld. During the welding process, when the current passes through the weldment, due to the resistance of the weldment, the electrical energy is converted into heat energy, which increases the temperature of the contact part of the weldment. When the temperature reaches the melting point of the material, the metal material melts and forms a molten core, which cools and solidifies to form a weld.
Principle and characteristics: The welding process of resistance welding is simple, efficient, and stable in welding quality, which is suitable for mass production of pipeline welding. However, resistance welding is only suitable for welding thinner pipes, and the welding effect for thick-walled pipes is not good. In addition, the power of the welding equipment is large, and the requirements for the power grid are high.
4. High-frequency welding Pipe welding machine:
Working process: High-frequency welding uses the skin effect and proximity effect generated by high-frequency current in the weldment to quickly heat the welding part of the weldment to a molten state, and then apply pressure to connect the weldment together. Specifically, the working principle of the high-frequency welding Pipe welding machine is to connect the output end of the high-frequency AC power supply to the induction coil. When a high-frequency current is passed through the induction coil, a high-frequency alternating magnetic field will be generated around it. Under the action of the alternating magnetic field, the pipeline will generate an induced current at the welding part of the pipeline. Due to the skin effect and proximity effect, the induced current is mainly concentrated on the surface of the pipeline and the part close to the induction coil, so that the metal materials in these parts are quickly heated to a molten state. Then, the molten metal is pressed by the extrusion device to connect the welded parts together.
Principle and characteristics: High-frequency welding has the advantages of fast welding speed, high welding efficiency and good welding quality. It is suitable for welding pipelines of various metal materials, especially thin-walled pipelines. However, the structure of high-frequency welding equipment is complex and has high technical requirements for operators.