Learning summary of welding practice

Model essay on learning summary of welding practice (generally 3 articles)

Welding, also known as welding and fusion, is a manufacturing process and technology to connect other thermoplastic materials such as metals or plastics by heating, high temperature or high pressure. The following is a summary essay of my welding practice. Welcome to read the reference.

Summary of welding practice study 1 I was deeply impressed by the short one-week welding practice class, and I feel full every day. The insightful experts in the training work gave me specific operational guidance with vivid cases and rich knowledge, which provided me with first-line practical experience. Let's talk about some insights I gained through this training:

(1) Having a good sense of safety and economy is responsible for yourself and others, and it is an essential quality for a learner. Specific to the current work includes the following points:

1, to prevent fire (open flame is forbidden in the training room), and the soldering iron must be cut off when people leave.

2. Beware of electric shock. Please check the electrical equipment carefully before turning on the power. Check that the soldering iron is unplugged. Be careful that the welding head burns the conductor sheath.

3. Prevent mechanical damage.

4. Prevent burns.

Preparation and necessary knowledge:

1. How to use the new electric soldering iron: firstly, polish the internally heated electric soldering iron on sandpaper, then apply electricity to soak rosin, then use solder wire to touch the tough surface of the welding head, and finally rub it on the board or thick paper shell to make it bright.

2. polish the old electric soldering iron before using it.

3, the use of electric soldering iron matters needing attention.

(1) Check the temperature of the welding head with rosin, and don't touch the welding head with your hands. The faster the generated volatile gas rises, the higher the temperature in the welding head.

(2) The heating part of the electric soldering iron should be placed on the iron frame.

(3) Solder gas is harmful and should be paid attention to; Solder contains lead, so be careful to wash your hands. We are prepared, but we also need our own learning purpose.

(2) Knowledge mastery point:

1, familiar with relevant welding engineering terms, and understand the basic knowledge of commonly used welding materials.

2. Through training, I have mastered the basic welding process knowledge.

3. Master the basic concepts of welding production technology and practical knowledge of welding technology, so as to lay a foundation for future courses.

4, understand the welding safety technical knowledge, completes the safety training; Ability training point, through welding simple workpieces, cultivate our welding process analysis ability and hands-on operation ability, and lay a solid foundation for future production and technical work.

Two or more materials (the same or different) are heated or pressurized, or both are used to combine atoms to form permanent connections. The soldering iron is divided into external heating type and internal heating type, and the external heating type generally has higher power.

The internal heating electric soldering iron is small in size and cheap in price. 20W—30W internally heated electric soldering iron for general electronic production. The internal heating electric soldering iron has high heating efficiency and is convenient to replace the welding head.

Electric soldering iron is used for welding. For the convenience of use, it is usually made into "solder wire", and solder wire generally contains rosin for welding. The welding wire is composed of about 60% tin and 40% lead and has a low melting point. Rosin is a flux that can help welding.

Hold the electric soldering iron in your hand, and be careful when using it. The newly bought soldering iron should first check the resistance between the plug and the metal shell with a multimeter resistance file, and the multimeter pointer should not move. Otherwise, it should be thoroughly checked.

(3) Basic operation steps of manual welding:

1. Put the bonding head on the bonding pad and the component pin to increase the temperature of the bonding point.

2. When the solder joint reaches the appropriate temperature, put the rosin welding wire on the solder joint to melt in time.

3. After the solder melts, the welding head should be slightly moved according to the shape of the solder joint, so that the solder evenly covers the solder joint and penetrates into the gap of the welding surface. After the welding wire is melted to an appropriate amount, the welding wire should be removed quickly.

4. Remove the soldering iron. When the solder on the solder joint is almost full, the flux (rosin) has not completely volatilized, the temperature is appropriate, the solder is the brightest, and the fluidity is the strongest, move the welding head quickly along the component pin direction. Take it back quickly when leaving, and leave the solder joint at the same time to ensure that the solder joint is bright, smooth and burr-free. Cut off the long pins of the component with side cutters, so that the pins of the component can be slightly exposed from the solder joints.

5. After welding several points, wipe the welding head with metal wire to make the welding head clean and bright.

Excessive heating will not only damage the parts, but also make the welding appearance worse. High temperature will decompose and carbonize rosin flux, and also destroy the adhesive layer of copper pad on printed board, resulting in peeling of copper pad.

(4) Dismantling and welding:

1, welding principle

The steps of disassembly and welding are generally opposite to those of welding. Before dismantling welding, it is necessary to understand the characteristics of Chu Yuan welding points, and do not start work easily.

(1) Do not damage the parts, wires and structural parts removed from the original weldment.

(2) Do not damage the pads and printed lines on the printed circuit board during welding.

(3) For the components that have been judged to be damaged, the lead can be cut off first and then removed, which can reduce the possibility of other damages.

(4) During disassembly and welding, try to avoid disassembling other parts or changing their positions. If it is really necessary, we must do a good job of recovery.

2, welding points

(1) Strictly control the heating temperature and time.

The heating time and temperature of disassembly and welding are longer and higher than that of welding, so the temperature and heating time should be strictly controlled to avoid scalding parts or tilting or breaking gaskets. Intermittent heating method should be used to remove welding.

(2) Don't use too much force when disassembling welding.

At high temperature, the packaging strength of components will decrease, especially plastic packaging devices, ceramic devices, glass terminals and so on. Excessive pulling, shaking and twisting can damage parts and gaskets.

(3) Absorb the solder on the solder joint.

Before removing the solder, use a solder suction tool to suck the solder, and sometimes you can directly remove the component. Even if there is a small amount of tin connection, it can reduce the disassembly time and reduce the possibility of damage to components and printed circuit boards. If there is no tin suction tool, you can turn the printed circuit board or movable parts upside down and heat the solder joints with an electric soldering iron. Using the principle of gravity, solder can automatically flow to the welding head, and can also achieve the purpose of partial tin removal.

3. Quality requirements for disassembly and welding

(1) Good electrical contact.

(2) the mechanical combination is firm.

(3) beautiful.

4. Quality requirements of solder joints

(1) Reliable electrical connection.

(2) Sufficient mechanical strength.

(3) The appearance is smooth and tidy.

Specific operation and harvest:

In welding training, through video teaching, we can understand the latest achievements of the development of contemporary electronic technology and the basic methods of welding technology. In the welding of printed boards and wires, my welding technology is constantly improving. At first, my solder joints were like steamed bread, not bright enough. After improvement, my solder joint is bright, without virtual welding, which meets the welding requirements. On the welding evaluation board, I welded the board beautifully at once.

In the assembly training of electronic products, I know the whole process of electronic products from raw materials to qualified products. The process of PCB manufacturing, installation, overall assembly, testing and debugging has benefited me a lot. In the production and installation of printed boards, any mistakes and deviations may lead to irreparable losses, so be extra careful when installing and welding. In the whole assembly, special attention should be paid to the welding of the power cord, which can neither be virtual welding nor lap welding. The final test and debugging is a key step. Product functions should be checked one by one, and problems should be changed in time.

Learning summary of welding practice 2 After this welding practice, I personally realized that welding requires a rigorous attitude and some necessary skills. Under the guidance of the teacher, we learned the basic welding technology. Summarize this welding training as follows:

First, having good safety awareness and economic awareness is responsible for yourself and others, and it is an essential quality for a learner.

1, to prevent fire, pay attention to safety when using electric soldering iron, the electric soldering iron must cut off the power supply when people leave, open the window of the training room during welding training, and keep the air circulating.

2, it is forbidden to get an electric shock, carefully check the electrical equipment before turning on the power supply, pay attention to wire winding when welding, to avoid the welding head scalding the conductor sheath.

3. Prevent burns.

Second, the precautions for welding multimeter.

1, first find out the resistance to be welded for each resistance value and mark it.

2. Tin the component pins during welding.

3, the correct use of five-step welding, avoid virtual welding, tin more, tin less, overheating, cold welding, holes, sharp corners, bridge welding, peeling and other solder joint defects.

4. When installing the LCD screen, the conductive tape should be kept clean to prevent the LCD screen from being dirty. If there is any garbled code, you can wipe it with alcohol and reinstall it.

5, after the completion of the circuit board installation, debugging and assembly.

Summary of welding practice study 3 Through a week's study, I feel that I have gained something in the following aspects:

1. Have a preliminary and systematic understanding of the theory of electronic technology.

We learned the welding skills of common components and circuit components, the design, production and technological process of printed circuit board diagram, the working principle of radio and the role of components. This knowledge is not only effective in the classroom, but also of great guiding significance to the study of electronic technology courses in the future, and also has practical significance in daily life.

Second, it is a great exercise for your practical ability.

Experience is the mother of wisdom. Throughout the ages, all inventions have been tested by practice. If the hands-on ability is not enough, you can talk about making achievements in future scientific research, especially experimental research. During the internship, I exercised my hands-on ability and improved my ability to solve problems. For example, when assembling and debugging the radio, several gaskets were welded together with small spacing, but the task was still completed.

Third, the internship course internship allows us to learn a lot of practical things that we can't learn in textbooks.

By assembling a light-controlled alarm circuit, we can apply the composition of some circuits, the working principles of some circuit elements and the detection of their normal operation in practice, and get extension and expansion. It not only enhances the practical ability, but also deepens our understanding and application of textbook knowledge. Really learn to discover, ask and solve problems independently, find out what the problems are in practice, and explain them with what you know, help each other with your classmates and make progress in discussion.

Learned the basic welding technology, circuit detection and debugging, electronic product assembly technology, electronic components identification and quality inspection, the whole machine assembly technology. All these have cultivated our hands-on ability and rigorous work style, and laid a good foundation for our future work, which should also be very useful in our computer professional course of learning hardware in the future.

Through welding training, I really learned a lot of knowledge and broadened my horizons. Through the welding training here, my hands-on operation ability has been enhanced. I remember when I was in high school, I helped to install a switch control circuit at home. Because the hands-on ability is not strong enough, the circuit is short-circuited. Fortunately, there was no major safety accident because the circuit was originally fused. And through the electronic welding training here, I have mastered more standard circuits than fluorescent lamp circuit installation and learned a lot. I also learned some knowledge of low-voltage electrical appliances, and learned their specifications, models and usage methods.

Through this welding practice, we have also cultivated our bold, cautious and cautious work style. Generally speaking, this internship is a very valuable experience, which makes us more exposed to practical problems in life and learn to simply investigate and deal with them, so as not to have no clue, which also plays a positive role in our future life and study. I hope there will be more practical courses like this in the future, so that practice and theory can be better combined. Students are required to master the correct use of electrocautery money to avoid accidental injury.

Generally speaking, this welding training has also cultivated our standardized work style and our team spirit of unity and cooperation.

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