Weak current College】 【copper aluminum pipe technology development co., Ltd ---- Power By】 【China power house network.

In 2007, air conditioning and external machines connecting pipe materials "copper tube, or copper aluminum tube well" controversy by "hidden" bucket "grow into" Ming struggle. It is called the "dark" bucket "is a copper-aluminum tube" as early as the 1980s began, but never comes into focus, the main reason for this is the price of copper, aluminum raw material. It is called "out" refers to the dispute over the past few years, namely since 2004, under the influence of various factors at home and abroad, copper raw materials prices rose sharply in 2004 at $/ton to 3 Yuan/ton, 3 million in 2005 to $/Mt/Mt, while in the beginning of 2006 exceeded 4.5 Yuan/ton, the highest in more than $ 8.5/ton, now maintained at 6 million Yuan/tons. Enterprises to reduce production costs, increase market competitiveness, concern with the "copper aluminum tube" instead of copper tube. Causing a "controversy" brass, aluminum, copper and aluminium tube is a "black tube" or new technology, business, expert.

In fact, the "copper aluminum tubes" is not only applied to the air conditioning of the connection tubing, also used in refrigerators, air conditioning condenser and evaporator (commonly known as the "two-reader"). "Copper aluminum tube" manufacturing methods can be divided into non-welding and welding methods, including welding methods have the friction welding, thermal welding, Flash welding, resistance welding, brazing and ultrasonic welding, non-welding methods lock ring, threads and adhesive tie pressure, etc. This article to "copper aluminum tube" welding technology-oriented introduction to the "copper aluminum tube" technology research and development, and strive to make the readers to be able to fully understand the "copper aluminum pipe" technologies.

Situation abroad

In 1957, the former Soviet Union has copper aluminum tube flash butt welding technology, developed MCKH-150-copper aluminum Flash welding machine, welding diameter copper aluminum tube 10mm-30mm.

In 1972, the former Soviet Union has copper aluminum tube cold pressure welding technology.

In 1977, the United States is copper-aluminum tube of high-temperature ultrasonic welding technology with the "copper clad aluminum" joint forms, brass end belling, welding, aluminum tube inserted welding specifications for copper tube diameter 5.75mm, 7.4mm, aluminium tube diameter 6mm, 8mm.

In 1985, the former Soviet Union has copper aluminum tube magnetic pulse welding technology.

In 1988, Japan has copper aluminum tube of high-frequency heating pressure welding, welding specifications for copper tube diameter, wall thickness 1mm 8mm, aluminium tube diameter, wall thickness 1.2mm. 8mm

In 1998, Japan "aluminum coated copper" joint forms, brass end welding necking, plug it into the aluminum tubes, welding specifications for copper tube diameter, wall thickness 0.6mm 8mm, aluminium tube diameter, wall thickness 0.6mm 8.2mm.

In addition Japan began in 1975, an air conditioner heat exchanger tube wall thickness of thin-walled, 0.8mm by 1.0mm, reduced to 0.41mm, even 0.35mm. The information also refers to the United States has used the diameter, wall thickness 8mm 0.3 copper tube manufacturing air-conditioning heat exchanger.

Domestic situation

Basic uses the "aluminium coated copper" joint forms.

In 1984, refrigerators with copper aluminum pipe of explosive welding technology identification by provincial departments, in 1985, and metallal Research Institute's Steven Fu, etc. published a refrigerator with copper and aluminium connecting pipe explosion welding, welding specifications for copper tube diameter, wall thickness 1mm 8mm, aluminium tube diameter, wall thickness 1.5mm. 8mm

In 1987, Chengdu Institute of electric welding machine, Xie Jian delivered a copper aluminum pipe friction welding research paper, copper-aluminum tube specifications are the diameter, wall thickness 1.5mm. 8mm

In 1988, Beijing shipping integrated technology development company of Chang Yan, senior engineer, developed Yu-0288 aluminium-copper pipe welding machine, semi-automatic special Flash to produce copper aluminum fittings 60 million, up to 98% pass rate.

In 1989, Xinxiang refrigerator factory of Guo shunxiang also introduced the evaporator with copper aluminum fitting Flash welding technology, the welder is Italy producing T8/P-copper aluminum pipe welding machine, welding capacity 25kVA, copper-aluminum tube specifications are the diameter, wall thickness 1mm. 8mm
In 1991, Xi'an aircraft engine company of Lee Pui Sen, published a refrigerator with copper aluminum fitting of energy research, the successful development of welding PW-1-energy machine, copper-aluminum tube specifications are the diameter, wall thickness 1mm. 8mm

In 1994, the Zhu ping, Shanghai Jiao Tong University published a refrigerator copper-aluminium fitting of DC Flash welding research paper, copper-aluminum tube specifications are the diameter, wall thickness 0.8mm. 8mm

In 1998, Shenyang University of Chang Chuan, made of copper and aluminum tube resistance welding research papers, development of computer control-insertion type copper aluminum tube resistance welding machine, the machine time control accuracy up to 0.01s, daily production capacity of 200 PCs, up to 98% pass rate.

The same year the Sino Yung Hefei University of technology released a refrigerator with copper aluminum fitting summary paper capacitor discharge welding, copper-aluminum tube specifications are the diameter, wall thickness 1mm and 8mm 1.5mm.

In 2004, Shandong University of Zhao Yue completed the refrigerator pipeline system copper-aluminum tubes, welding specifications soldering of copper tube diameter, wall thickness 0.75mm 6mm, aluminium tube diameter, wall thickness 1mm. 8mm

From "copper aluminum tube research course", "copper aluminum tube" technology is not yet perfect, neither can be defined as "black heart tube," because the "copper aluminum tube" is copper resource shortage of one of the enterprise and consumer prices for raw materials for the Suppression of the rising costs of production and living one way; nor will it advocated for flawless technique, because the "copper aluminum tube," there are many technical problems to be solved. To sum up, the "copper aluminum pipe" technologies should be considered in the development of new technologies.