The working principle of electric welding machine

01 Jul 2022

It uses the high-temperature arc generated when the positive and negative poles are short-circuited instantaneously to melt the solder on the electrode and the material to be welded to achieve the purpose of combining them. The structure of the electric welding machine is very simple. To put it bluntly, it is a high-power transformer that converts 220V AC into a low-voltage, high-current power supply, which can be either DC or AC. The welding transformer has its own characteristics, that is, it has the characteristics of a sharp drop in voltage. After the electrode is ignited, the voltage drops. In the adjustment of the working voltage of the electric welding machine, in addition to the one-time 220/380 voltage conversion, the secondary coil also has a tap conversion voltage. ...The electric welding machine is generally a high-power transformer, which is made of the principle of inductance. The inductance will produce a huge voltage change when it is turned on and off. It uses the high...

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Welder safety operation rules

21 Jun 2022

1. Operating procedures for electric welders (1) Electric welding (gas cutting, gas welding) workers must undergo physical examination, professional training, and work with certificates. Wear protective equipment before work, carefully check the safety and reliability of electric and gas welding equipment and equipment, and check in advance when operating pressurized containers, airtight containers, and pipelines. To rinse clean. Welding and cutting in the container requires two people to take turns, and one person to monitor outside. The lighting voltage should be below 36 volts. (2) Strict implementation. "Three-level fire protection approval system". It is forbidden to store inflammable and explosive materials in the welding site. Fire-fighting equipment is provided according to regulations, and sufficient lighting and good ventilation are ensured. (3) The shell of the electric welding machine should be effectively grounded, and the grounding or zero connection, and the working retu...

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The main problems that should be paid attention to when using butt welding machine

15 Jun 2022

(1) The worktable for feeding and feeding the material should be kept level with the lower part of the cutter, and the length of the worktable can be determined according to the length of the processed material. When processing long steel bars, there should be a special person to help, and obey the instructions of the operator, and do not push or pull arbitrarily. (2) Before starting, it must be checked that the cutter should be free of cracks, the bolts of the tool holder are fastened, and the protective cover is firm. Then turn the pulley by hand, check the gear meshing clearance, and adjust the cutter clearance. (3) After starting, it should be idling first to check that the transmission parts and bearings are running normally before operation. (4) The material shall not be cut when the machine does not reach the normal speed. When cutting, the middle and lower parts of the cutter must be used, and the steel bar should be grasped and fed quickly to the knife edge. It is strictly for...

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The composition of automatic welding equipment

08 Jun 2022

1. The welding power source, its output power and welding characteristics should match the welding process method to be used, and be equipped with an interface connected to the main controller. 2. Wire feeder and its control and speed regulation system, for the wire feeder that requires higher control accuracy of wire feeding speed, its control circuit should increase the speed measurement feedback 3. The welding head uses its moving mechanism, which consists of the welding head, the welding head support frame, the hanging carriage, etc. It is based on the precision welding head mechanism, and its drive system should use a servo motor equipped with an encoder 4. Weldment moving or displacement mechanism, such as welding roller frame, head and tail frame turning machine, slewing platform and positioner, etc. The precise mobile displacement mechanism should be driven by servo motor 5. Weldment clamping mechanism 6. The main controller, also known as the system controller, is mainly used ...

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Types of automatic welding equipment

02 Jun 2022

According to the degree of automation, automated welding equipment can be divided into the following three categories: 1. Rigid automatic welding equipment Rigid automatic welding equipment can also be called primary automatic welding equipment, most of which are designed according to the principle of open-loop control. Although the whole welding process is completed automatically by the welding equipment, it cannot be a closed-loop feedback system for the fluctuation of welding parameters during the welding process, and the possible deviation cannot be corrected randomly. 2. Adaptive control of automatic welding equipment Adaptive control welding equipment is a kind of welding equipment with a high degree of automation. It is equipped with sensors and electronic detection circuits to automatically guide and track the welding seam trajectory, and implement closed-loop feedback control of the main welding parameters. The whole welding process will be completed automatically according to...

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Preheat and interpass temperature

23 May 2022

When welding structural steel, especially when the thickness is greater than 25mm, the preheating temperature of the weldment should be determined according to the chemical composition, thickness, ambient temperature, etc., and through the weldability test and production test. Preheating can increase the welding speed, thus reducing the residence time of the molten pool metal at high temperature or reducing the burnout of alloying elements. At the same time, it can increase the stirring and fusion ability of the molten pool, accelerate the diffusion and escape of hydrogen, and prevent the generation of pores. Preheating can also appropriately reduce the welding current, which is convenient for beginners to operate. The following weldments or environments require preheating of weldments: ① Weldments with higher welding strength ② Welding of steels with a tendency to harden ③ Welding materials with particularly good thermal conductivity ④ Weldments with larger thickness ⑤ When the ambien...

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