High frequency welding process
High frequency welding process: use high-frequency power supply to weld aluminum pipes, copper pipes, and stainless steel pipes
1. Welding of aluminum pipes:
The use of high-frequency power sources for welding steel pipes in China began in the 1950s and has been widely used since then. However, the use of high-frequency power sources for welding aluminum pipes is still in the experimental stage. The use of high-frequency welding aluminum pipes abroad began in 1955, and by 1966, the number of high-frequency welding aluminum pipes in the United States had reached about 50% of the total number of aluminum pipes. Using high-frequency welding of aluminum pipes has a fast welding speed, narrow heat affected zone of the weld seam, good weld quality, and high production efficiency. Therefore, this will be a developing process in the industry of manufacturing aluminum pipes. In 2000, our company manufactured a specialized high-frequency equipment for welding aluminum tubes for a branch of Hubei Second Automobile Manufacturing Factory and achieved success. During welding Φ nine × When the welding speed of 0.3mm aluminum pipe reaches 120m/min, pressure and flattening tests are conducted, and all the quality is qualified.
(1) The technical difficulties of aluminum pipe welding process include: ① low melting point, high thermal conductivity, large thermal capacity, and large thermal expansion coefficient of aluminum. ② Aluminum and oxygen have a great affinity, and their oxides can cause inclusions in the weld seam When aluminum is in liquid state, it can absorb a large amount of hydrogen gas, so aluminum welding is prone to generating pores When the heating temperature of aluminum and its alloys reaches the melting point, the process of transitioning from solid to liquid occurs quickly and there is no color change, so welding × There are certain difficulties in work.
(2) Requirements for high-frequency power supply: In response to the technical difficulties of aluminum tube welding process, there are the following requirements for high-frequency power supply: ① Use a higher frequency to narrow the heat affected zone of the weld seam and reduce the current on the inner wall of the tube. ② The power density of the weld seam is required to be high, and the faster the welding speed, the better the quality of the weld seam The DC voltage of the electronic tube anode should be stable and smooth, with a pulsation coefficient of about 1%.
(3) Several measures to be taken for welding aluminum tube high-frequency power supply: ① Use a higher frequency, 600~700KHz for 100KW equipment, and 700~800KHz for 60KW equipment. ② The anode power supply of the electronic tube adopts 12 phase rectification and is equipped with a smooth filter. Due to the use of thyristor voltage regulation, it should be operated at a small conduction angle state to reduce the ripple coefficient after rectification. ③ Having a higher output power enables aluminum pipes to have a higher welding speed. ④ A reasonable oscillation circuit should achieve convenient load adjustment.
(4) Application prospects: 1. Aluminum has the characteristics of large reserves, high specific strength, light weight, and corrosion resistance. Therefore, welded aluminum pipes with high production capacity and low cost are widely used in agricultural sprinkler systems, chemical engineering, light textile, light construction, and furniture to replace steel pipes. At present, argon arc welding is commonly used for welding aluminum pipes in China, with a very low speed. High frequency welding can be used instead to achieve a very high speed. The equipment manufactured by our company can achieve a welding speed of over 120m/min for small diameter thin-walled pipes. In addition, high-frequency welding can also be used for welding stainless steel pipes, copper pipes, brass pipes, and non magnetic metal pipes. We hope that this new technology can attract the attention of professional pipe manufacturers.
2. Welding of copper and brass pipes:
In 2001, we also achieved success in using high-frequency power sources to weld copper and brass pipes. The welded pipes were
1. Welding of aluminum pipes:
The use of high-frequency power sources for welding steel pipes in China began in the 1950s and has been widely used since then. However, the use of high-frequency power sources for welding aluminum pipes is still in the experimental stage. The use of high-frequency welding aluminum pipes abroad began in 1955, and by 1966, the number of high-frequency welding aluminum pipes in the United States had reached about 50% of the total number of aluminum pipes. Using high-frequency welding of aluminum pipes has a fast welding speed, narrow heat affected zone of the weld seam, good weld quality, and high production efficiency. Therefore, this will be a developing process in the industry of manufacturing aluminum pipes. In 2000, our company manufactured a specialized high-frequency equipment for welding aluminum tubes for a branch of Hubei Second Automobile Manufacturing Factory and achieved success. During welding Φ nine × When the welding speed of 0.3mm aluminum pipe reaches 120m/min, pressure and flattening tests are conducted, and all the quality is qualified.
(1) The technical difficulties of aluminum pipe welding process include: ① low melting point, high thermal conductivity, large thermal capacity, and large thermal expansion coefficient of aluminum. ② Aluminum and oxygen have a great affinity, and their oxides can cause inclusions in the weld seam When aluminum is in liquid state, it can absorb a large amount of hydrogen gas, so aluminum welding is prone to generating pores When the heating temperature of aluminum and its alloys reaches the melting point, the process of transitioning from solid to liquid occurs quickly and there is no color change, so welding × There are certain difficulties in work.
(2) Requirements for high-frequency power supply: In response to the technical difficulties of aluminum tube welding process, there are the following requirements for high-frequency power supply: ① Use a higher frequency to narrow the heat affected zone of the weld seam and reduce the current on the inner wall of the tube. ② The power density of the weld seam is required to be high, and the faster the welding speed, the better the quality of the weld seam The DC voltage of the electronic tube anode should be stable and smooth, with a pulsation coefficient of about 1%.
(3) Several measures to be taken for welding aluminum tube high-frequency power supply: ① Use a higher frequency, 600~700KHz for 100KW equipment, and 700~800KHz for 60KW equipment. ② The anode power supply of the electronic tube adopts 12 phase rectification and is equipped with a smooth filter. Due to the use of thyristor voltage regulation, it should be operated at a small conduction angle state to reduce the ripple coefficient after rectification. ③ Having a higher output power enables aluminum pipes to have a higher welding speed. ④ A reasonable oscillation circuit should achieve convenient load adjustment.
(4) Application prospects: 1. Aluminum has the characteristics of large reserves, high specific strength, light weight, and corrosion resistance. Therefore, welded aluminum pipes with high production capacity and low cost are widely used in agricultural sprinkler systems, chemical engineering, light textile, light construction, and furniture to replace steel pipes. At present, argon arc welding is commonly used for welding aluminum pipes in China, with a very low speed. High frequency welding can be used instead to achieve a very high speed. The equipment manufactured by our company can achieve a welding speed of over 120m/min for small diameter thin-walled pipes. In addition, high-frequency welding can also be used for welding stainless steel pipes, copper pipes, brass pipes, and non magnetic metal pipes. We hope that this new technology can attract the attention of professional pipe manufacturers.
2. Welding of copper and brass pipes:
In 2001, we also achieved success in using high-frequency power sources to weld copper and brass pipes. The welded pipes were
