The current situation and development direction of steel barrel seam welding machine in China

The electric resistance welding method used for seam welding of steel barrels has appeared in the late 19th century, but it was still blank in China until the 1940s. It has only been produced in the production of brazing sheet structural parts since the 1950s. Application, and used to make steel drums, is after the 1960s. Since the 1970s, resistance welding technology has developed rapidly. All domestic barrel making enterprises use domestic semi-automatic seam welding machines to weld steel barrels. In recent years, under the situation of introduction, digestion and absorption of foreign equipment, China has also developed a fully automatic seam welding machine in the late 1980s. Compared with the original universal semi-automatic seam welding machine, it has greatly improved. But so far, it is still not mature enough, and most domestic barrel companies still use the old-style universal semi-automatic seam welder. In the late 1990s, a variety of seam welding devices and improved systems for semi-automatic seam welding machines appeared in succession. As a product of the transition period, it did play a certain role, but compared with the automatic seam welding machine, Still not perfect.

Current status of steel barrel seam welder in China

At present, China's domestic steel barrel seam welding machine has the following deficiencies:

First, the equipment still lacks a simple and reliable non-destructive testing method

Since the heating of the electric resistance welding uses the internal heat source-resistance heat, all the factors affecting the size of the resistor and the fluctuation of the power supply will cause heat fluctuations, which makes the welding quality unstable. Therefore, reliable non-destructive testing methods have become the key to determining the quality of welding.

Second, the equipment is low in automation, high in power, poor in welding quality, and difficult to control

China's steel barrel seam welder still uses a universal semi-automatic seam welder, which has a low degree of automation and can only produce about 3 per minute. The power consumption is large and the adjustment control is difficult. Before the seam welding of the barrel, it is generally necessary to carry out polishing, circle rounding, edge welding and other processes, and the welding quality is difficult to guarantee.

Third, the size, shape and thickness of the welding material are limited by the equipment.

The thickness and size of the steel drum material are limited by the power of the welding machine, the size of the welding arm and the shape of the structure. The adaptability range and adjustment range of the same seam welding machine are limited, so only different sizes and thin steel drums can be used. Seam welder. The adjustment adaptability of the semi-automatic seam welding machine is very poor, and the parameter changes are all based on experience. In addition, the material and thickness deviation of the steel plate used in China are large, so the welding quality is difficult to guarantee.

Fourth, the weld seam is thicker, waste material and affect the quality of the steel drum

The steel barrel seam welder adopts lap joints, and the universal semi-automatic seam welder has a lap width requirement of more than 10 mm, which increases the waste of materials. When the weld is stressed, there is additional torque, which makes the bearing condition worse. , reducing the carrying capacity. Moreover, due to the thicker lap joint, the quality of the subsequent process of the steel drum is affected.

Development direction of steel barrel seam welding machine in China

According to the above shortcomings, we should develop from the aspects of ensuring welding quality, expanding the scope of adaptation and improving production efficiency in view of the development of foreign steel barrel seam welding technology in recent years.

First, to ensure the quality of welding

(1) Development of monitoring and self-control

In order to ensure stable and good welding quality, we must first control the process parameters in the welding process, such as welding current, voltage between electrodes, electrode pressure, etc., should use the integrated circuit device that can be accurately controlled for display, monitoring and automatic adjustment. And use other physical quantities such as temperature and electrode displacement as the basis for control, which is an important measure to improve productivity and welding quality.

(2) Improve the mechanical system of the welder.

Improve the rigidity of the welder and the followability of the machine head, so that the pressure and the weldment are misaligned due to insufficient rigidity or follow-up of the frame, the arm and the electrode holder during the welding pressurization, which is undesired. defect. It is also one of the key issues that should be solved to study better welding materials and structures to improve the quality of weld surface, extend the life of the welding wheel and reduce the deformation of the barrel.

(3) Development of non-destructive testing.

Steel barrel seam welding materials are relatively thin. How to use some simple non-destructive methods to check the quality of welding is an important topic that has been explored for decades. At present, steel drum manufacturers only test the weld quality by introducing compressed air into the steel drum after the steel drum is made. In fact, this is extremely one-sided. No air leakage does not guarantee that the welding strength will meet the requirements, so there are often hidden dangers. In addition, this kind of inspection method can not achieve the problem of timely finding the seam welder and automatically feedback and adjustment, thus ensuring the stability of the welding quality.

Second, expand the scope of adaptation

(1) Expand the scope of adaptation of the welding machine.

At present, the power of the welding machine is developing in two directions: one is to develop the miniaturized welding machine, and the other is to develop to the high-power welding machine. However, high-power welders overload the network and generally take measures from the characteristics of the power supply.

For the same welder, if it can adapt to the influence of material thickness and material deviation, the welding quality can be more effectively guaranteed.

(2) Improve the power supply characteristics.

According to the welding characteristics and quality requirements of different materials, and considering the power supply conditions of the manufacturers, the development of capacitor storage, low frequency, high frequency, DC pulse, secondary rectification and other types of welding machine. The seam welder adopts a three-phase power network to ensure uniform load, and the current waveform is steep and gentle, so as to adapt to the welding requirements of different materials. It can reduce input power and save energy, so the current development is relatively rapid. In particular, high frequency welding machines have been greatly developed.

Third, improve productivity

In order to improve productivity and shorten the auxiliary time, there should be development in the structure of the welder, the electrode welding wheel, and the control.

(1) Specialization of welding machine

The specialization of welding machines is an important measure to adapt to mass production. The automation of the welding process, in accordance with the requirements of the barrel process, to achieve automation of feeding, rounding, seam finding, welding, dressing electrode welding wheel and quality inspection, to end the current low-level general-purpose situation of steel-made domestic seam welding machine To further improve work efficiency and product quality. The production efficiency of the automatic sewing machine can be increased by more than ten times compared with the semi-automatic seam welding machine.

(two) improve the process

Improvements in the process can reduce welding time and auxiliary time, thereby increasing productivity. We can learn from the advanced features of imported automatic seam welding machine and develop new automatic seam welding machine technology equipment. For example, the automatic steel barrel seam welder has a lap width of only 2-4 mm, completely eliminating material waste and quality defects.

(III) Improving the quality of welding machine welding wheel

Seeking better performance of the welding wheel material, improving the welding wheel structure, improving the electrical conductivity, extending the life of the electrode, can save a lot of auxiliary time for repair and replacement of the electrode, which is also an important measure to improve productivity and product quality.

The development of China's steel barrel seam welding machine is far behind the development of the barrel industry, and the development of domestic automatic steel barrel seam welding machine is imminent. At present, China's existing seam welding machine manufacturers are developing new steel barrel automatic seam welding machines. More than 300 barrel-making enterprises across the country will wait and see, and we hope that the domestic steel drum automatic seam welding machine will come out soon to solve the demand of domestic steel drum automatic seam welding machine. We believe that in the near future, China's steel drum automatic seam welding machine will certainly have the same development as the current can welding machine.

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