Application of process control technology in welding

。Is it necessary to repair spacecraft in space?

Welding technology in industry generally depends on the type of job, in general:

1.Manual arc welding, argon arc welding, electroslag pressure welding, flash butt welding, oxyacetylene flame gas welding and cutting, and carbon dioxide protection welding are commonly used in civil engineering for steel structure installation and non-ferrous metal welding.

2.Plastic welding is mostly used for hot melt welding of various engineering plastics, in which plastic bonding should also belong to the welding process.

3. The welding of shipbuilding boilers and various pressure vessels requires higher welding process requirements and stricter technical requirements, on-site operations, and uses special processes such as manual arc welding, argon arc welding, carbon dioxide protection welding, and electroslag welding.

3.There are also ultrasonic welding, first-class welding, etc., which are special welding technologies under special processes, and their uses are limited in actual operations, and they are no longer classified.

The above answer is more one-sided, because the scope of welding technology is more than the welding process, the topic is too broad technology is different from the process, different processes can cause the same technical results, I hope the questioner can distinguish it!

In our country, welding operations need to be licensed, welders are the type of work that belongs to the access category, in the professional qualifications of skilled personnel, only five of the 81 types of work in the access category, welders are one of them, and the actual situation is that most of the industry practitioners are unlicensed operations. With the continuous standardization of technology and the relevant requirements of the industry, more and more people want to take a welding certificate, the advantage of the certificate is still very large, first of all, the salary of the certificate and the non-certificate are very different, often able to reach more than double or higher level. Therefore, the issue of short-term welder training has naturally become a concern for practitioners.

Welding as an industrial "tailor" is a very important means of processing in industrial production, the quality of welding plays a decisive role in the quality of the product, so, what is the future development of welding technology?

Industry outlook. With the development of production, welding is widely used in aerospace, aviation, nuclear industry, shipbuilding, construction and machinery manufacturing and other industrial sectors, in China's economic development, welding technology is an indispensable means of processing. After entering the 21st century, welding is an important part of the manufacturing industry, and the rapid development, so it has brought unprecedented development opportunities to the welding industry.

At present, China consumes 300 million tons of steel every year (about tons of welded structure), and needs about 750,000 welding machines, and the welding industry will continue to grow in the next 8 10 years.

Electric welding, wind welding, argon arc welding, CO2 shielded welding, laser welding, brazing, vacuum ion welding, etc.

The automated welding robotic arm, also known as the welding robot, is an automatic control machine that can be reprogrammed by the control system during the welding process. This welding control system is a microcomputer, programmable system.

Welding technology is an operation method that uses welding materials [welding rods or wires] to connect two or more pieces of base metal [workpiece to be welded] into a whole under high temperature or high pressure conditions. Welding technology is mainly used in metal base metal, commonly used arc welding, argon arc welding, CO2 protection welding, oxygen-acetylene welding, laser welding, electroslag pressure welding and other non-metallic materials can also be welded. Welding is a processing technology and connection method that uses heating, pressure, or both to produce atomic bonding between two workpieces of the same sex or the opposite sex.

Welding has a wide range of applications and can be used for both metals and non-metals. (1) During welding and cutting operations, especially gas cutting, due to the use of compressed air or oxygen jets, sparks, molten beads and iron slag are splashed everywhere (larger molten beads and iron slag can be splashed to a place 5m away from the operation point), and when there are flammable and explosive materials or gases in the working environment, fire and accidents may occur.

2) During the high-altitude welding and cutting operation, the flammable and explosive materials within the range of Mars are not cleaned up, and the operator throws the welding rod head indiscriminately during the work, and does not carefully check whether there is a fire after the operation.

3) The acetylene generator is not placed in accordance with the specified requirements during the work process of gas welding and gas cutting, and the safety devices of the welding (cutting) torch, rubber pipeline and acetylene generator are not checked as required before work.

4) There are deficiencies in the formulation of gas cylinders, deficiencies in the storage, filling, transportation, and use of gas cylinders, and violations of safety operation procedures.

5) The formulation and installation of acetylene, oxygen and other pipelines are defective, and their deficiencies are not found and rectified in time during use.

6) When welding fuel containers and pipelines, corresponding measures were not taken as required. When the replacement welding is implemented, the replacement is not complete, and the pressure is not enough to cause the external open flame to be introduced when the pressure is not replaced by the pressure.

Preventive measures for fire and accidents during welding operations.

1) When welding and cutting operations, all flammable and explosive within the scope of the operating environment will be 380

When cleaning up the items, attention should be paid to whether there are non-flammable liquids and combustible gases in the trenches and sewers of the working environment, as well as whether there is a possibility of leaking into the gutters and sewers of flammable and explosive substances, so as to avoid disasters caused by welding slag and metal sparks.

2) When high-altitude welding and cutting, it is forbidden to litter the welding rod head, and the welding and cutting operation should be isolated below, and the operation should be carefully and meticulously inspected after the operation is completed, and the site can only be left after confirming that there is no fire hazard.

3) Gas cylinders that meet the requirements of relevant national standards and regulations should be used, and safety operation procedures should be strictly observed in the storage, transportation and use of gas cylinders.

4) The pipelines transporting combustible gas and combustible gas shall be installed, used and managed according to the regulations, and special safety technical training shall be carried out for operators and inspectors.

5) When welding fuel containers and pipelines, the welding method should be determined in combination with the actual situation. When the replacement method is implemented, the replacement should be thorough, and the shadow of the combustible substance should be strictly controlled in the work, and a certain voltage should be maintained as required when the pressure is not replaced by the implementation of the non-replacement method. Its oxygen content should be strictly controlled in the work.

It is necessary to strengthen testing, pay attention to monitoring, and have safety organizational measures.