Welding Machine

There are many types of welding machines, including single-point single-function, single-point dual-function, and single-point multi-function. Angle of welding). There are also two-point, three-point, four-point and even six-point welding machines and four-point welding machines. Different types of welding machines have different welding functions and work efficiency

Welding is the process of joining metal parts with various fusible alloys (solder). The melting point of the solder is lower than that of the material to be welded, so that the part will not be melted, through the intermolecular contact on its surface to complete the welding.

Welding can be divided into soft welding and hard welding. The temperature of soft welding is lower than 450°C, and the temperature of hard welding is higher than 450°C. Hard welding is usually used for metals such as silver, gold, steel, copper, and its welding point is much stronger than soft welding, and its shear strength is 20 to 30 times that of soft welding. The above two types of thermal connections usually use the term soldering, because in both cases molten solder is written into two elongated gaps between the clean and close solid metal surfaces of the device.

Welding ensures the continuity of the metal. On the one hand, the two metals are connected by bolts or physical attachments to each other, showing a strong metal whole, but this connection is discontinuous. Sometimes if there is an oxide insulating film on the metal surface, they may even Right or wrong in physical contact. Another shortcoming of mechanical connection compared with welding is that the contact surface continues to oxidize, resulting in the addition of resistance. In addition, vibrations and other mechanical shocks can also loosen the joints. Welding eliminates these problems, the welding part does not move relative to each other, the contact surface will not be oxidized, and the continuous conduction method can be maintained. Soldering is a process of fusion between two metals. In the molten state, the solder will dissolve some of the metal in contact with it, and the surface of the metal being soldered often has a thin oxide film that cannot be dissolved by the solder. Flux is used to remove it. This layer of oxide film. The welding process usually includes:

1. Melting of the flux to remove the oxide film on the surface of the welded metal;
2. Melting the solder makes the impure substances and lighter flux suspended in it float to the surface;
3. Some dissolve some metal connected with solder;
4. Cool down and end the melting of metal and solder.

Often in order to locate the problem of the circuit function, it is necessary to remove the components from the printed circuit board and perform the necessary measurements. This repair process usually includes:

1. Disassembly of extra components;
2. Inspection of components;
3. Exchange of defective components;
4. Check the function of the circuit.

In the operation of picking and communicating electronic components, a welding process is required.

The reliable and successful operation of space, defense, medical electronics, traffic control systems, communication systems, and surveillance and control system equipment all depend on excellent welding. Under strict and hostile environmental conditions, such as temperature changes, humidity, vibration, etc., even a poor solder joint can cause some or all of the system to lose control.

There are countless welding points in the equipment, and the reliability of these welding points should even be higher than the equipment itself. The research in this area has led to the addition of knowledge of materials and their properties, and many developments have been made in the possible welding processes. Welding technology is an accompanying technology. With the development of the electronics industry, more useful packaging technologies and smaller components will certainly continue to emerge. Welding technology will also continue to be developed to meet the needs of the electronics industry and environmental issues. This is why welding is becoming more and more professional for technology professors who work in the electronics industry.

The Classification Of Welding Machines

Welding machines are mainly divided into two types according to materials: plastic welding machines and metal welding machines. The main technologies applied are: ultrasonic, high frequency, plasma, electrothermal, rotary, etc.

Among them, the plastic welding machine is used to weld polyethylene, polypropylene, polypropylene, nylon and other thermoplastic engineering plastic sheets or products. During operation, the plastic welding rod is melted and sprayed out, and the welded workpiece is fused and bonded. It is widely used in the welding and maintenance of plastic equipment, plastic floor laying, plastic pipe connection, plastic bottle sealing and other operations.

The metal welding machine mainly welds metal materials.

Automatic Welding Machine

The solar battery automatic welding machine can automatically and continuously weld the front and back sides of the battery according to the set requirements to form a battery string. The welding tape is automatically fed and cut during welding, and the battery string is automatically collected after the welding is completed. Welding methods include infrared lamp welding and high-frequency electromagnetic induction welding.

Compared with manual welding, the automatic string welding machine and automatic single chip welding machine have the following advantages:

1. The welding speed is fast, the quality is consistent, the surface is beautiful, and there is no uneven soldering phenomenon caused by manual welding. Equipment welding can avoid the influence of various human factors during manual welding, such as the influence of the operator’s proficiency, the influence of physical conditions, and the influence of emotions, so as to ensure the consistency and reliability of the welding.
2. It can reduce the number of operators and inspectors, reduce management difficulty and product cost. Labor costs are increasing year by year, and annual recruitment is the most troublesome thing for bosses. The automatic welding machine can greatly reduce the number of employees.
3. The welding reliability of stringer is much greater than manual welding. Poor welding is an important cause of premature failure of components. The design life of solar photovoltaic modules is 25 years, and the modules are usually installed outdoors, and they have to withstand temperature changes of about 30°C every day. With the change of seasons, the temperature changes are even greater. Since the base material of the solder ribbon is pure copper, the expansion coefficient of copper is about six times that of silicon (cell). This difference means that as long as there is a temperature change, the solder ribbon and the cell will be stressed. Therefore, poor welding will cause the power of the component to decrease, and in severe cases, it will cause the component to fail. There are many reasons for poor soldering caused by manual soldering, such as the temperature of the soldering station, the coating of flux, the temperature of the soldering iron, the proficiency of the personnel, etc. Some aspects can be solved by effective management, while some situations cannot be solved. Fully controlled, the full-automatic stringer can get a good solution to the factors that affect the reliability of the welding process in the manual welding process.

Ultrasonic Welding Machine

Overview of Ultrasonic Welding Machine

Ultrasonic welding machine is suitable for sealing and welding of 18, 26, 30, 50, 80, 100 and other O, D, U-shaped guardrail pipe plugs. It does not require glue bonding, and it is watertight and has beautiful appearance, easy operation and production efficiency. High, low defect rate and other characteristics.

Basic Principles And Characteristics Of Ultrasonic Welding Machine

The 15KHZ high-voltage and high-frequency electrical signal is generated by the ultrasonic generator, which is converted into the mechanical oscillation of the same frequency through the piezoelectric inverse effect of the transducer. Plastic guardrail tube sealing machine, LED guardrail tube welding machine, guardrail lamp welding equipment, guardrail The sealing and welding machine at both ends of the tube acts on the plastic workpiece in the form of audio longitudinal waves. The temperature transmitted to the interface increases through the friction between the surface of the workpiece and the inner molecules. When the temperature reaches the melting point of the workpiece itself, the workpiece interface quickly melts , And then fill the gap between the interfaces. When the vibration stops, the workpiece is cooled and shaped under a certain pressure at the same time to achieve perfect welding.

It is suitable for welding of plastic products. According to its output power, it is divided into 900W plastic welding machine, 2600W plastic welding machine, 3200W plastic welding machine, 4200W plastic welding machine, 5600W plastic welding machine, etc.

It is suitable for welding of plastic products. According to its output power, it is divided into 900W plastic welding machine, 2600W plastic welding machine, 3200W plastic welding machine, 4200W plastic welding machine, 5600W plastic welding machine, etc.

Ultrasonic Welding Machine Operation Method

The operator puts the lamp tube into the fixture, presses the start button, and the two compression cylinders descend to position the workpiece in the ultrasonic mold cavity. Then the ultrasonic welding head moves to trigger ultrasonic waves. The welding head welds the workpiece and the cylinder drives the welding. The upper die is reset, the compression cylinder rises, and the operator takes out the workpiece to complete an operation.

Laser Welding Machine

The Principle Of Laser Welding

The laser welding machine uses high-energy laser pulses to locally heat the material in a small area. The energy of the laser radiation diffuses into the material through heat conduction, and the material is melted to form a specific molten pool. It is a new type of welding method. Laser welding is mainly aimed at welding thin-walled materials and precision parts. It can realize spot welding, butt welding, stitch welding, sealing welding, etc., with high aspect ratio, small weld width, and heat-affected zone. Small, small deformation, fast welding speed, smooth and beautiful welding seam, no need or simple processing after welding, high welding seam quality, no air holes, precise control, small focus spot, high positioning accuracy, and easy to realize automation.

Laser Welding Characteristics

It belongs to fusion welding, which uses laser beam as energy source to impinge on the weldment joint.

The laser beam can be guided by a flat optical element (such as a mirror), and then a reflective focusing element or lens is used to project the beam on the weld.

The laser welding machine is a non-contact welding, and the operation process does not need to be pressurized, but an inert gas is required to prevent oxidation of the molten pool, and filler metal is occasionally used.

Laser welding can be combined with MIG welding to form laser MIG hybrid welding to achieve large penetration welding, and at the same time, the heat input is greatly reduced compared with MIG welding.

Advantages Of Laser Welding

1. The required amount of heat input can be reduced to the minimum, the metallographic change range of the heat-affected zone is small, and the deformation caused by heat conduction is also the lowest.
2. The welding process parameters of 32mm plate thickness single pass welding have been verified and qualified, which can reduce the time required for thick plate welding and even save the use of filler metal.
3. There is no need to use electrodes, and there is no concern about electrode contamination or damage. And because it is not a contact welding process, the wear and deformation of the machine tool can be minimized.
4. The laser beam is easy to focus, align and be guided by optical instruments. It can be placed at an appropriate distance from the workpiece, and can be re-guided between tools or obstacles around the workpiece. Other welding rules are subject to the above-mentioned space limitations. And can’t play.
5. The workpiece can be placed in a closed space (after vacuuming or the internal gas environment is under control).
6. The laser beam can be focused on a small area and can weld small and closely spaced parts.
7. There is a wide range of weldable materials, and various heterogeneous materials can also be joined to each other.
8. It is easy to automate high-speed welding, and it can also be controlled by digital or computer.
9. When welding thin materials or thin-diameter wires, it will not be as easy to be troubled as arc welding.
10. It is not affected by the magnetic field (arc welding and electron beam welding are easy), and can accurately align the weldment.
11. Two metals with different physical properties (such as different resistances) can be welded.
12. No vacuum or X-ray protection is required.
13. If the through-hole welding is adopted, the depth-to-width ratio of the weld bead can reach 10:1.
14. The device can be switched to transmit the laser beam to multiple workstations.

Disadvantages Of Laser Welding

1. The position of the weldment must be very precise and must be within the focus range of the laser beam.
2. When the weldment needs to use a jig, it must be ensured that the final position of the weldment is aligned with the welding point that the laser beam will impact.
3. The maximum weldable thickness is restricted and the penetration thickness of the workpiece is far more than 19mm, and the laser welding machine is not suitable for the production line.
4. For materials with high reflectivity and high thermal conductivity, such as aluminum, copper and their alloys, the weldability will be changed by laser.
5. When performing medium to high energy laser beam welding, a plasma controller needs to be used to drive out the ionized gas around the molten pool to ensure the reappearance of the weld bead.
6. The energy conversion efficiency is too low, usually less than 10%.
7. The weld bead solidifies rapidly, and there may be concerns about porosity and embrittlement.
8. The equipment is expensive.