A 300-word essay on gas welding and gas cutting internship experience

After nearly 15 days of welding internship, I learned a lot of welding knowledge. Welding is a processing technology and connection method that combines atoms of two workpieces of the same or opposite sex through heating, pressure, or both. Welding technology is mainly used on metal base materials. Commonly used ones include arc welding, argon arc welding, CO2 shielded welding, oxygen-acetylene welding, laser welding, electroslag pressure welding, etc. There are more than 40 metal welding methods, which are mainly divided into three categories: fusion welding, pressure welding and brazing.

In the electric welding internship, we understood the essence of electric welding, the composition and functions of electric and gas welding equipment, the structure of tools, the types of gas welding flames, adjustment methods and applications, and the functions of welding wire and flux. Learned the types of welding rods to use and how to operate the welding machine.

During the internship, we followed the basic operations taught by the master, practiced slowly, and gradually mastered the essentials of electric welding. On the first day, my eyes were injured by the arc light. My eyes were stinging, red and swollen at night, making it difficult to sleep. The exposed areas such as my neck and face were slightly red and itchy. The teacher said before the internship that we should prevent arc burns and scalds to our eyes and skin. Before working, check whether the welding machine is well grounded and the welding clamp cable is in good condition to prevent electric shock. Do not touch the welded workpiece with your hands, and do not place the welding clamp on the workpiece to prevent short circuit and burning the welding machine.

1. The following are the points I remembered during my internship

1. The secondary coil machine shell of the welding machine must be properly grounded, and its grounding resistance does not exceed 400Ω;

2. The welding machine should be placed in a place that is easy to dissipate heat, and its temperature should not exceed 70°C. Each welding machine should be equipped with a switch;

3. The primary and secondary circuits must be complete and easy to identify , the circuit insulation must be good;

4. The handle of the welding machine used must be complete, with reliable insulation, and a protective plate if necessary;

5. The welder should be in the position of an electrician Carry out repairs, replace circuits and other parts under guidance, and do not do it alone;

6. Check whether the grounding is firm and the tools are complete before and after work, and eliminate unsafe factors such as burning caused by welding;

7 Do not let people without protective masks look at the arc light, and wear protective glasses when removing slag and rust;

8 I am new to electric welding, and I have been practicing flat welding for 4 days and I still can’t weld straight. It's not smooth either, and I can't hold it steady with my hands. After a long period of practice, I discovered that there are actually two types of movements, one is the linear movement in the flat welding direction, and the other is the direction in which my hand stretches forward when the welding rod is burning. The speed in both directions is constant. It will be welded straight and smooth.

10. When welding or welding thick or rigid welds under low temperature conditions on site, the measures to be taken are flame heating preheating methods before welding.

2. Thoughts after the internship:

1. This internship allowed me to understand modern welding methods, practical welding knowledge and the role of new processes, new technologies and new equipment in welding. application.

4. The welding internship has trained me, improved my overall quality, given me a deeper understanding of the importance of the welding internship, improved my practical ability, and made me better The combination of theory and practice has consolidated the knowledge I have learned.

5. Throughout the entire internship process, the master had very strict disciplinary requirements for us, and strengthened the requirements for filling in internship reports, cleaning the welding construction site, and complying with safe operating procedures. This also enhanced our overall engineering quality. Cultivation has played a better role in promoting.

6. The fruits of my labor during the internship gave me a sense of pride and accomplishment, which is difficult to express in words.

Time flies by. The welding internship made me deeply realize the meaning of life. Practice is the test standard of truth. Through the welding internship, I learned a lot of common sense about work, and also got a mental training, which was both bitter and joyful. It will have a great impact on my future work.

Part 2: Summary report on the internship of fitters, lathes and welders

Summary report on the internship of fitters, lathes and welders

Unconsciously, it lasted for three weeks The metalworking internship is over.

During these three weeks, we have benefited a lot and have fully understood the basic knowledge of technicians. This is knowledge that we cannot learn in school classes and is also valuable experience for our future work.

Before the internship started, we were always full of expectations for the internship. As the internship approached day by day, our mood also became excited. It should be said that what I thought at that time was just that I didn't want to go to class. During the internship days, I could temporarily get rid of the dull and boring classes. This should be what most people think. Finally, the day arrived after much anticipation.

I used to hear people talking about metalworking internship, but I didn’t know what these four words meant. I later figured it out after searching on Baidu. The full name should be ‘Metal Processing Technology Internship’. It is a practical basic course and an indispensable elective course for students majoring in mechanical engineering to learn engineering materials and mechanical manufacturing basics. It is of great significance to cultivate our hands-on ability and allows us to understand traditional machinery. Manufacturing processes and modern machinery manufacturing technology. I think that for those of us college students who study theoretical knowledge in class all day long, such a basic practical class is essential.

When we graduate, we will face the test of society. Of course, what the company wants is not some 'theorists' who can only talk on paper. What they want at that time is you who can do it with real guns and ammunition. This requires us to have a certain degree of practical ability and combine theoretical knowledge with practice to adapt to the enterprise. operation. The following is the specific content of my metalworking internship.

On the first day of the internship, we took a bus to the ‘Metalworking Internship Base of Beijing Institute of Technology Zhuhai College’ where the internship will be held for the next three weeks. When we arrived at the factory, of course we couldn't avoid the leader's lecture, which talked about a series of safety issues and used several real cases to convey the importance of safety to us. Factories have never been a place for fun. We used to see many factory safety accidents on TV. So, this is no joke. Now that we are here, we should have the professional ethics of workers and not be as casual as in school. Several real-life examples of leadership also keep us in mind. Next is the division of labor. In our internship this time, there are five types of work, namely fitter, lathe, CNC programming (belonging to the machining center), welder, and caster. The fitter and lathe work lasted three and a half days respectively, while the others lasted two days, and one day was spent visiting the entire factory. This is the main content of our three-week internship.

1. Fitter

This is the first type of work we do, and it is also the most primitive metal processing work. In layman's terms, it requires you to use a file to file the iron block into the shape you want. This should be a physical job, and it also requires you to have good patience and perseverance.

Our task this time is to make a handicraft, which is divided into a display item and a base. The display item has drawings and requires you to process the item according to the dimensions above; and the base requires us to Designed and processed by myself. When processing the exhibits, the master asked us to strictly follow the steps on the drawing. First, file and flatten an iron plate into a square, then mark, dot, drill, and smooth. Every step was done according to the drawing. The dimensions are strictly carried out.

How to hold a file is the most basic knowledge, because fitters spend 80% of their time using files, some are large and some are small, some are round and some are square, some are sharp and some are flat, that is to say, only You are a qualified fitter only if you know how to use a file. The file is divided into a blade body and a handle. Generally, the right hand holds the handle of the blade, and the left hand lightly holds the tip of the blade. The blade surface is parallel to the plane being filed, and then the file is twitched in a rhythmic manner and pressed down hard with both hands at the same time. This back and forth movement will eventually wear it out. The extra flat surface to be filed. My understanding of fitters is "stable". As the saying goes, slow work produces careful work, and this is the truth. But this is also one of its shortcomings. Production efficiency is low, and it has now been replaced by high-tech CNC lathes.

2. Lathe

After finishing the work of fitter, the next thing we have to do is lathe. This is a relatively dangerous job with clear and strict work requirements.

It relies on a high-speed rotating head on a lathe to drive the object to be processed, and then uses a turning tool to process it. Under that high-speed rotating head, if you are not careful, it may cause serious consequences.

This time our task is to make a thread and a small hammer. Of course, due to time constraints, the master will help us cut the length. We only need to polish the workpiece while the workpiece rotates at high speed. As long as it is smooth

that is to say, put sanding paper on its surface, and then polish the surface while rotating at high speed. This is a delicate job, and you have to be careful, so we all have to be very alert when polishing. After we have polished the surface smooth, we need to drill a hole in the hammer head, and then use tapping to tap out the thread. Similarly, we also need to make threads on the hammer handle, and then screw the two together. In this way, a The little hammer came out.

3. CNC programming

CNC machine tools should be the most commonly used processing machine tools in factories now. And we have to learn to control the machine tool to finish the parts by writing programs.

Currently there are three types of programming: software programming, manual programming, and voice programming. What we need to learn now is simple manual programming, which is suitable for some simple processing work. To understand manual programming, you must first remember some of the most basic programming codes. These code masters spent the morning explaining to us. In fact, these codes seem complicated, but they are actually quite simple to remember. The master combined examples to help us understand the operation of programming very intuitively. Later, the master drew a graphic and asked us to write its processing program. Seeing a processing program appear in my hands, I really felt a little sense of accomplishment, even though it was just a simple program.

Later, we carried out the actual operation. First, we input the program we wrote into the control terminal of the machine tool, and then determined the zero coordinate point. In this way, the pre-processing steps were completed. Next, the input program is called out to process the workpiece. After the program is processed, the shape of the workpiece becomes what the master drew for us. This should be an interesting experience.

Four. Welder

Next comes the welder. In fact, I have always been interested in electric welding and like to see the sparks shooting out. In the past, every time I saw others welding, I always wanted to experience it myself. However, this kind of thing is not something that can be played casually.

I believe that anyone who has studied physics will basically know that electric welding is actually a short circuit through high-voltage current. The end of the welding rod and the iron block to be welded form a high temperature to melt the iron block, thereby bonding the two iron blocks. combined.

The most important thing when welding is not to rush. Let every point be fully melted and stuck together before moving. Many cases are caused by moving too fast and the welding is not strong. Another safety issue is that you must wear eye protection, as the light that is instantly excited is very dazzling.

Our welding task this time is to weld the floor in the factory, which is made of iron plates piece by piece. What we have to do is to weld the iron plates together. First, the master helped us lay the points, and then we just needed to weld a line between the points.

5. Foundry

Casting is the last project of our internship. To put it simply, it is making molds. What we make are sandbox molds. The sand used to make a sandbox is made of fine sand, coarse sand, and cinder mixed in a certain proportion with a small amount of water. The fine sand has a fixing effect, while the cinder plays a role in smoothing the surface. It is best for the sand used in casting to form into a ball by holding it with your hands, and then spread it out by gently kneading it with your hands. If this effect is achieved, it is qualified sand.

What we are going to do this time is a dumbbell. First, place the empty box in place, and then place half of the dumbbell model into the empty box. Then add sand, shovel the prepared sand into the empty box, and when it is full, pack the sand into a solid state, and then add more sand until the entire box is full of solid sand. Make the other half of the sandbox in the same way, except that the second half of the sandbox must be placed on top of the previous half of the sandbox, which requires the first half of the sandbox to be very flat. After the two halves of the sandbox are ready, separate the sandbox, take out the model, dig out the casting channel, and drill the exhaust holes, and then you have a sandbox.

The next thing to do is to pour the high-temperature melted liquid aluminum alloy into the pouring port of the sandbox. This basically completes one casting.

On the last day of the internship, we went to visit the factories, including Zhuhai Runxingtai Co., Ltd. and Zhuhai Yichen Die Casting Co., Ltd. We watched the entire production line, from product molding, to processing, to surface treatment, to spray painting, and finally packaging. The main purpose of this visit is to let us understand the work on the production line, let us see the difference between real work and experiments, and let us deepen our understanding of the machinery manufacturing industry through real and intuitive front-line production. Many people say they don't like the working environment in the factory because they are afraid of getting dirty. In fact, in some modern factories, more highly technical work is done, and the environment of some workshops is no different than that of an office. The factory visit allowed us to understand the specific mechanical processing process, which I believe will be of great help to our future employment guidance.

In this way, the three-week metalworking internship has come to an end. This is a very unusual experience. I believe many college students will like it. Compared with the dull university classroom, such an internship It should be considered interesting. This internship has exercised our hands-on ability and allowed us to integrate the theories learned in the classroom into practice.

This is a very good experience. The feeling of personal experience is always stronger than the explanation in the book.