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1. Welding of aluminum tubesThe use of high-frequency electric resistance welded steel pipe in China began in the 1950s. This process has been widely used, but the high-frequency power supply is used to weld the aluminum tube. Currently, it is still in the experimental stage. The foreign high-frequency welding aluminum tube started in 1955. In 1966, the number of high-frequency welded aluminum tubes in the United States reached about 50% of the total aluminum tubes. High-frequency welding of aluminum tubes, the welding speed is faster than the straight seam submerged arc welded pipe, the weld heat affected area is narrow, the weld quality is good, and the production efficiency is high. Therefore, in the industry of manufacturing aluminum tubes, this will be a development. Process.

Technical difficulties in the welding process of aluminum tubesa. Aluminum has a low melting point, high thermal conductivity, large heat capacity, and large thermal expansion coefficient.b. Aluminum and oxygen have a great affinity, and their oxides can cause inclusions in the weld.c. Aluminum can absorb a large amount of hydrogen when it is in a liquid state, so the welding of aluminum tends to generate pores.d. When the heating temperature of aluminum and its alloy reaches the melting point, the process proceeds from the solid state to the liquid state, and the process proceeds quickly, and there is no color change, so there is a certain difficulty in welding.2. Requirements for high frequency power supplyFor the technical difficulty of the aluminum tube welding process, the following requirements are imposed on the high frequency power supply:a. Use a higher frequency, so that the weld heat affected zone is narrow and the pipe inner wall current is reduced.b. The power density of the weld is required to be large, and the faster the welding speed, the better the weld quality.c. The anode voltage of the tube anode is required to be stable and smooth, and its pulsation coefficient is required to reach about 1%.3. Several measures adopted for welding aluminum tube high frequency power supplya. Use a higher frequency, 600 ~ 700KHz for 100KW equipment, 700 ~ 800KHz for 60KW equipment.b. The tube anode power supply adopts 12-phase rectification and is equipped with a smoothing filter. Because of the thyristor voltage regulation, it should be operated Butt fusion welding machines in a small conduction angle state to reduce the pulsation coefficient after rectification.c. has a higher output power, so that the aluminum tube has a higher welding speed.d. reasonable oscillation circuit, should be easy to adjust the load.4. Application prospectsAluminum has the characteristics of large reserves, high strength, light weight and corrosion resistance. Therefore, the welded aluminum tubes with large output and low cost are widely used in agricultural sprinkler irrigation systems, chemical, textile, light construction and furniture to replace steel pipes.. At present, domestic welding aluminum tubes are mostly argon-arc welded, the speed is very low, and high-frequency welding is used instead, which can achieve high speed.

The equipment manufactured by our company can achieve a welding speed of more than 120m/min for small-diameter thin-walled tubes. In addition, high-frequency welding can also be used to weld stainless steel pipes, copper pipes, brass pipes, etc., and non-magnetic metal pipes. This new technology is expected to attract the attention of the pipe manufacturing professional factory.2. Welding of copper and brass tubesIn 2001, we also succeeded in welding copper tubes and brass tubes with high-frequency power supplies. The welded tubes were tested by techniques such as pressing, reaming, and biasing, and were all qualified products.3. Welding of stainless steel pipeThe technology of welding stainless steel tubes with high-frequency power in foreign countries has been widely applied. We have not yet practiced it, and we are willing to cooperate with enterprises that need it to complete it.

TIG or Tungsten Inert Gas is technically known as Gas Tungsten Arc Welding. The TIG welding process uses a non-consumable tungsten electrode which is responsible for delivering current in the arc. The tungsten and weld puddle are protected and cooled through an inert gas, mostly Argon. TIG welding is similar to oxy-acetylene welding in that it uses a filler material to build-up reinforcement. TIG welding is often called Heli-Arc welding because of the early popularity of the Hobart Heli-Arc machine and many old-timers still refer to it by that name. TIG welding is mostly used for welding Steel and Aluminium and requires a high level of patience and skill. TIG welding, in general, needs a pair of steady and skilful pair of hands, but this skill is not hard to acquire with practice. It is also sensitive to how you have the welding area set up.

A large number of components go into making the TIG welding process work. As important as individual skill may be, to get the most out of TIG welders, one should choose the right welder, electrodes, as well as pay close attention to accessories like the torch and gas control apparatus. TIG welding relies on the selection of right tools for the job and each component plays a critical role in the welding process. Here is a brief description of the kind of aspects you will need to keep in mind when working with a TIG welder to get the best results. Choosing the Right Electrode The Tungsten electrode is a non-consumable electrode. Tungsten has the highest melting point among all metals at 3,422C (6192F). This property of Tungsten makes it optimal for carrying the current to the arc. Tungsten electrodes come in a variety of diameters ranging from 1mm to 40mm (0.040 to 5/32 inches). According to the industry standards, they are available in lengths of 18cm or 7 inches. You can also choose custom lengths but they cost more than the standard ones. To reduce the confusion among various types of tungsten electrodes, a coloured band is applied on the tip of the electrode. They generally come in five colour codes: pure tungsten (green), 2% ceriated (orange), 1.5% lanthanted (gold), rare earth (grey) and 2% thoriated (red). Each one of them has different purposes and functions, though a lot of them overlap. For instance, lanthanated tungsten can do all that thoriated tungsten electrodes can. However, Butt fusion welding machines while the former is used for AC TIG welding, the latter is not. The shape of the tip of the electrode is also important in the welding process. There are three ways to prepare tungsten for welding – balled, pointed, and truncated. The preparation of the tungsten depends on the type of the tungsten you are using and the metals to be welded. Welder There is no single welding process which suits all welding operation. TIG welding uses AC for Magnesium and Aluminium and DC with straight polarity (DCSP) for ferrous metals like iron and steels. For TIG welding operations, AC/DC TIG welders offer the maximum versatility and the output current can be modified to be used as per the requirement. These TIG welders do cost more, but also allow you to take on special projects that cannot be done with other welders such as MIG or MMA welders. Accessories TIG welding provides excellent finish and high quality.

It is commonly used for many cosmetic operations where appearance and strength are both important. Accessories like the shielding and cooling gas and the welding torch are important but they do not affect the quality of work to the same degree as the electrodes and welder do. You can choose Argon or and Argon-CO2 mix for most welding operations. About the Author: Kym Morgan is the marketing director of eWelders.com.au, a leading online specialty welding site in Australia. They sell a massive range of MIG Welders, TIG Welders, ARC Welders, Inverter Welders, Multi-Purpose Welders, High Function TIG Welders, AC/DC TIG Inverters, Spot Welders and Engine Driven Welders in Australia. Their mission at eWelders.com.au is to gather Australia’s best range of welders and put them under one roof.