The main part of the Butt fusion welding machines is a […]
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. The grains, weld structure and composition are close to the base metal, so it is easier to obtain equal strength and equal plastic welded joints. In the process of flashing, it has the function of self-protection to exhaust air and reduce metal oxidation, so that the weld seam contains less defects, such as insufficient penetration.
Advantages of butt welding machine
1. High welding efficiency. Because the work piece is compressed by the double force cylinder, its reaction speed is significantly faster than the hydraulic cylinder.
2. Automatic centering function. Ensure that the spacing between the two ends of the pipe column and the two film ends before welding is consistent, so as to ensure the same amount of burning at both ends.