Definition of welding: Welding is a method of processing that joins two pieces of metal together with or without the use of filler metal by heating or pressing, or by heating and pressure, to form a non-detachable permanent connection. .
Development trend of welding technology 1. Improving welding productivity is an important driving force for promoting the development of welding technology There are two ways to increase productivity: first, improve the welding deposition rate, for example, three-wire submerged arc welding, and the process parameters are respectively 220A/33V, 1400A40V, 1100A45V. The groove section is small and baffles or gaskets are installed behind it. The 50-60mm steel plate can be formed by one-time welding. The welding speed can reach over 0.4m/min. The deposition rate is more than 100 times that of the electrode arc welding. The second approach is to reduce the groove profile and metal cladding. The most prominent achievement in the past decade has been narrow gap welding. Narrow gap welding is based on gas shielded welding, using single wire, double wire, and three wire for welding. No matter the thickness of the joint, it can be used in the form of butt joints. For example, the thickness of the steel plate is 50 to 300 mm, and the gap can be designed to be about 13 mm. The amount of deposited metal required is reduced several times or several times, thereby greatly increasing productivity. The key technology of narrow-spot welding is to see how to ensure the penetration of both sides and ensure that the center of the arc is automatically tracked and located at the center line of the groove. For this reason, various countries have developed various schemes, resulting in a variety of narrow gap welding. law. Electron beam welding, plasma welding, laser welding, butt joints can be used, and do not open the groove, so it is more ideal narrow gap welding method, which is one of the reasons it is widely valued. The newly developed laser arc hybrid welding method can improve the welding speed, such as 5mm steel plate or aluminum plate, the welding speed can reach 2~3m/min, good forming and quality can be obtained, and the welding distortion is small.
2. Improve the mechanization of the preparation workshop. The automation level is the key development direction of the world's advanced industrial countries. In order to improve the production efficiency and quality of welded structures, there are certain limitations only from the welding process. Therefore, all countries in the world pay special attention to the technological transformation of the workshop. The main processes of the preparation workshop include material transportation, surface oil removal, sandblasting, and protective lacquer; steel scribe, cutting, beveling; component assembly and solidification. All of the above processes have been mechanized and automated in modern factories. Its advantage is not only to increase the product's productivity, but more importantly to improve the quality of the product.
3, welding process automation, intelligence is to improve the stability of welding quality, solve the bad labor conditions in an important direction.
4. The development of emerging industries continues to promote the advancement of welding technology. Welding technology has been invented for more than 100 years since its invention, and it can almost meet the needs of the production and manufacturing of all important products in the industry. However, the development of emerging industries still forces welding technology to continue to advance. The development of the microelectronics industry has promoted the development of micro connection processes and equipment; in turn, the development of ceramic materials and composite materials has promoted vacuum brazing and vacuum diffusion welding. The development of aerospace technology will also promote the development of space welding technology.
5. The research and development of heat sources is the fundamental driving force for the development of welding processes. The welding process uses almost any available heat source in the world, including flame, arc, resistance, ultrasonic, friction, plasma, electron beam, laser beam, microwave, etc. (Our company mainly uses arc welding and resistance welding automation welding equipment. (Master) The emergence of every heat source in history has been accompanied by the emergence of new welding processes. However, the development and research of welding heat sources have not yet been terminated.
6, energy-saving technology is a common concern. As we all know, welding energy consumption is very large, with electrode arc welding, for example, each about 10KVA, submerged arc welding machine for each 90KVA, resistance welding machine can be as high as thousands of KVA, many new technologies Appears to achieve this energy-saving goal. In resistance spot welding, the use of electronic technology, the exchange of spot welding machine into a secondary rectification spot welder, can increase the power factor of the welder, reduce the welder capacity, 1000KVA spot welder can be reduced to 200KVA, and Throw can achieve the same welding effect. In the past ten years, the emergence of inverter welding machine is another successful example. It can reduce the weight of the welding machine and improve the control performance of the power factor of the welding machine. It has been widely used in production.
Development trend of welding technology 1. Improving welding productivity is an important driving force for promoting the development of welding technology There are two ways to increase productivity: first, improve the welding deposition rate, for example, three-wire submerged arc welding, and the process parameters are respectively 220A/33V, 1400A40V, 1100A45V. The groove section is small and baffles or gaskets are installed behind it. The 50-60mm steel plate can be formed by one-time welding. The welding speed can reach over 0.4m/min. The deposition rate is more than 100 times that of the electrode arc welding. The second approach is to reduce the groove profile and metal cladding. The most prominent achievement in the past decade has been narrow gap welding. Narrow gap welding is based on gas shielded welding, using single wire, double wire, and three wire for welding. No matter the thickness of the joint, it can be used in the form of butt joints. For example, the thickness of the steel plate is 50 to 300 mm, and the gap can be designed to be about 13 mm. The amount of deposited metal required is reduced several times or several times, thereby greatly increasing productivity. The key technology of narrow-spot welding is to see how to ensure the penetration of both sides and ensure that the center of the arc is automatically tracked and located at the center line of the groove. For this reason, various countries have developed various schemes, resulting in a variety of narrow gap welding. law. Electron beam welding, plasma welding, laser welding, butt joints can be used, and do not open the groove, so it is more ideal narrow gap welding method, which is one of the reasons it is widely valued. The newly developed laser arc hybrid welding method can improve the welding speed, such as 5mm steel plate or aluminum plate, the welding speed can reach 2~3m/min, good forming and quality can be obtained, and the welding distortion is small.
2. Improve the mechanization of the preparation workshop. The automation level is the key development direction of the world's advanced industrial countries. In order to improve the production efficiency and quality of welded structures, there are certain limitations only from the welding process. Therefore, all countries in the world pay special attention to the technological transformation of the workshop. The main processes of the preparation workshop include material transportation, surface oil removal, sandblasting, and protective lacquer; steel scribe, cutting, beveling; component assembly and solidification. All of the above processes have been mechanized and automated in modern factories. Its advantage is not only to increase the product's productivity, but more importantly to improve the quality of the product.
3, welding process automation, intelligence is to improve the stability of welding quality, solve the bad labor conditions in an important direction.
4. The development of emerging industries continues to promote the advancement of welding technology. Welding technology has been invented for more than 100 years since its invention, and it can almost meet the needs of the production and manufacturing of all important products in the industry. However, the development of emerging industries still forces welding technology to continue to advance. The development of the microelectronics industry has promoted the development of micro connection processes and equipment; in turn, the development of ceramic materials and composite materials has promoted vacuum brazing and vacuum diffusion welding. The development of aerospace technology will also promote the development of space welding technology.
5. The research and development of heat sources is the fundamental driving force for the development of welding processes. The welding process uses almost any available heat source in the world, including flame, arc, resistance, ultrasonic, friction, plasma, electron beam, laser beam, microwave, etc. (Our company mainly uses arc welding and resistance welding automation welding equipment. (Master) The emergence of every heat source in history has been accompanied by the emergence of new welding processes. However, the development and research of welding heat sources have not yet been terminated.
6, energy-saving technology is a common concern. As we all know, welding energy consumption is very large, with electrode arc welding, for example, each about 10KVA, submerged arc welding machine for each 90KVA, resistance welding machine can be as high as thousands of KVA, many new technologies Appears to achieve this energy-saving goal. In resistance spot welding, the use of electronic technology, the exchange of spot welding machine into a secondary rectification spot welder, can increase the power factor of the welder, reduce the welder capacity, 1000KVA spot welder can be reduced to 200KVA, and Throw can achieve the same welding effect. In the past ten years, the emergence of inverter welding machine is another successful example. It can reduce the weight of the welding machine and improve the control performance of the power factor of the welding machine. It has been widely used in production.
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