What kind of preparations are needed for the flash butt welding machine before welding?

18 May 2020

When the flash Butt fusion welding machines is welding, sometimes the workpiece does not carry out the end face geometry, the processing of the blank end and the surface cleaning will affect the product after welding, so what preparation should we do before welding? In flash butt welding, the geometry and size of the butt joints of the two workpieces should be basically the same. Otherwise, the heating and plastic deformation of the two workpieces will not be guaranteed, which will affect the quality of the joint. In production, the difference between the diameters of round workpieces should not exceed 15%, and that of square and tubular workpieces should not exceed 10%. When flash butt welding a large-section workpiece, chamfer the end of a workpiece to increase the current density to facilitate laser flashing. In this way, the secondary voltage can be increased without preheating or flashing. The processing of the butt welding blank end can be performed on a shearing machine, punchin...

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What is the working principle of continuous flash butt welding machine?

12 May 2020

The welding cycle of the continuous flash butt welding machine is composed of flashing, upsetting, holding and stopping procedures. The two consecutive stages of flashing and forging constitute a continuous flash butt welding head forming process. The maintenance and rest procedures are necessary in the Hydraulic welding machines operation. Preheating flash butt welding has a preheating stage in its welding cycle (before flashing). The essence of the formation of flash: turn on the power and make the ends of the two weldments slightly touch. Many small contacts with very small resistance will be formed between the counterparts. Under the heating of a large current density, they will instantly melt to form a liquid beam connecting the two ends of the counterpart. At the same time, under the effect of radial electromagnetic compression force, electromagnetic repulsion and electromagnetic gravitation on the surface tension of the liquid, strong heating is added. There is a huge pressure d...

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Mechanical and technical properties used in the welding process

06 May 2020

1. The staff should be familiar with the welding process of the butt-fusion welding machine: (1) Continuous flash welding: continuous flashing, upsetting, and electric heating treatment on the welding machine after upsetting; (2) Preheating flash welding: one flash, preheating by firing, second flash, upset forging. 2. The operator must be familiar with the mechanical and technical properties used, as well as the location and application of the main components. 3. The operator should select the welding parameters according to the mechanical properties and welding material. 4. Weldment preparation: remove rust, oil and dust within 120 mm of the end of the steel bar. If the tip is bent, it should be straightened or cut off. 5. The butt welding machine should be installed indoors and should have reliable grounding (or zero connection). When multiple butt welding machines are installed together, the distance between the machines must be at least 3 meters. And connected to different power s...

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The main component of the butt welding machine is a step-down transformer

27 Apr 2020

The main part of the Butt fusion welding machines is a step-down transformer. At both ends of the secondary coil are the workpiece and the electrode to be welded. During operation, the arc is ignited, and the electrode is welded to the gap of the workpiece in the high temperature of the arc. Because the core of the welding transformer has its own characteristics, it has the characteristics of a sharp drop in voltage, that is, the voltage drops after the electrode is ignited; when the electrode is stuck and short-circuited, the voltage drops sharply. Next, I will introduce the principle of butt welding machine and its advantages. Scope of welding machine The welding has a wide range of application. In principle, all metal materials that can be forged can be welded by flash butt welding. For example, non-ferrous metals and alloys such as low carbon steel, high carbon steel, alloy steel and stainless steel can be welded by flash butt welding. Welding cross-sectional area is wide, generall...

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What are the advantages of butt welding machine

21 Apr 2020

The main part of the butt welding machine is a step-down transformer. At both ends of the secondary coil are the workpiece and the electrode to be welded. During operation, the arc is ignited, and the electrode is welded to the gap of the workpiece in the high temperature of the arc. Because the core of the welding transformer has its own characteristics, it has the characteristics of a sharp drop in voltage, that is, the voltage drops after the electrode is ignited; when the electrode is stuck and short-circuited, the voltage drops sharply. Next, I will introduce the principle of butt welding machine and its advantages. What the butt welding machine uses is that the resistance will generate heat when the workpieces are in contact with each other, so as to achieve the purpose of heating the workpiece, causing the metal surface to melt, and the welding seam is formed under the condition that the solid metal of the workpiece is plastically deformed. The grains, weld structure and composi...

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Is the welding efficiency of the butt welding machine high?

13 Apr 2020

The main part of the Butt fusion welding machines is a step-down transformer. At both ends of the secondary coil are the workpiece and the electrode to be welded. During operation, the arc is ignited, and the electrode is welded to the gap of the workpiece in the high temperature of the arc. Because the core of the welding transformer has its own characteristics, it has the characteristics of a sharp drop in voltage, that is, the voltage drops after the electrode is ignited; when the electrode is stuck and short-circuited, the voltage drops sharply. Next, I will introduce the principle of butt welding machine and its advantages. Butt welding machine principle What the butt welding machine uses is that the resistance will generate heat when the workpieces are in contact with each other, so as to achieve the purpose of heating the workpiece, causing the metal surface to melt, and the welding seam is formed under the condition that the solid metal of the workpiece is plastically deformed....

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