The butt welding machines have high welding accuracy during operation. When used, it can effectively use a programmable controller PLC and imported stepper motor to control the flash process, and can accurately set the burning amount and burning speed.
The welding current is controlled by a microcomputer solder-resist controller. The center distance error of the film head after welding can be controlled within ±0.2mm, which facilitates subsequent assembly welding.
The butt welding machines have an automatic centering function during operation, which can effectively ensure to a certain extent that the spacing between the two ends of the pipe string and the two head ends is consistent before welding, thus effectively ensuring that the amount of burning at both ends is consistent. .
Butt welding machines’ advantages
- High welding efficiency.
- Since the workpiece is pressed using the Power cylinder, its response speed is significantly faster than that of the hydraulic cylinder.
- The operation and maintenance services of the butt welding machine are convenient.
- Since there is no hydraulic station, the product has fewer debugging points and fault points, and there will be no oil leakage or other phenomena.
Technical requirements for butt welding machines
When the butt welding machine is in use, it is programmed to reduce the voltage. The characteristic of this welding method is that a higher secondary no-load voltage is used at the beginning of the flash to facilitate the stimulation of the flash. When the end face temperature rises, a lower secondary no-load voltage is used. voltage flash and keep the flash speed constant to improve thermal efficiency.
When approaching upsetting, the secondary voltage is increased to make the flash stronger to increase the self-protection effect.
The characteristic of the pulse flash butt welding method is that during the feeding stroke of the movable clamp, a reciprocating vibration stroke is superimposed through the hydraulic vibration device, the amplitude is 0.25-1.2mm, and the frequency is uniformly adjustable from 3-35Hz.
Due to vibration, the end faces of the weldment are alternately short-circuited and pulled apart, resulting in pulse flash.
Compared with ordinary flash butt welding, the pulse flash butt welding of the butt welding machine has no spontaneous explosion of the lintel, the spattered particles are small and the fire mouth is shallow, so the thermal efficiency can be more than doubled, and the upsetting amount can be reduced to 2/ 3-1/2.
