1. butt welder process According to the working princip […]
1. butt welder process
According to the working principle of the welding machine, the butt welding process can be divided into two types: resistance butt welding and flash butt welding:
Resistance Butt Welding Resistance butt welding is to heat the end of the reinforced joint to a plastic state and then cut off the power, and then heat it to the plastic connection. This welding process is easy in the joint part of oxidation and slag, and requires the steel part to be smooth and smooth. At the same time, welding consumes a lot of power and requires welding power, so it is rarely used.
Flash Butt Welding Butt welding means that during the welding process, from the reinforced end of the molten metal particles, sparks (i.e. flashes) are displayed. When the molten metal is sprayed, oxides and slag can also be released, so that the quality of welded joints can be widely used, especially for low carbon steel and low alloy steel butt joint, more suitable.
2. How to use
The use of butt welding machine should pay attention to the following points:
Adjust the distance between the two jaws. The jaw spacing should be the difference between the total length of the two welds and the amount of extrusion when the lever is at the left limit. When the joystick is in the correct position, the distance between the jaws should be the total length of the two welds plus 2~3mm, the original position before welding.
Adjust the short-circuit limit switch to automatically turn off the power at the end of the welding (reach the specified amount of extrusion).
Press the shape of the weld, adjust the jaws so that the two jaws are at the same level, and then clamp the weldment.
In order to prevent the weldment from overheating instantaneously, please try to increase the adjustment of the welding times and select the appropriate secondary voltage. In flash butt welding, it is appropriate to use a higher secondary voltage.
In order to avoid overheating of components during welding, the cooling water valve must be opened before welding. In order to facilitate inspection, a funnel is provided in front of the left side of the welding machine, so that the flow conditions can be directly observed, so that there is no cooling water flow in the welding machine.
3. Operation points of steel butt welding machine
Welder operators must receive professional training, be familiar with welding machine construction, performance, operating procedures, master the selection of process parameters, quality inspection and other specifications.
Before running, check whether the welding machine is sensitive and reliable, whether the electrical system is safe, whether the water pump system is not leaking, and whether the lubricating parts are suitable for oiling.
Welding shall not exceed the specified diameter of steel bars, and the main reinforcement butt welding must be cold drawn first. In order to ensure the welding quality, cleaning, rust prevention and correction work are carried out within the range of about 150mm of the end point.
Operators must carry good colored protective glasses and hats to avoid curling eyes and melting metal, causing skin burns.
Welders should be placed in a clean, ventilated and dry place. On-site welders should be equipped with rain, moisture and sun protection, and a fire extinguisher.
The welding machine should be equipped with a special wiring switch and installed in the switch box, and the machine capacity of the fuse capacity should be 1.5 times. The welding machine enclosure must be well grounded.
The post-weld appearance inspection shall show that the steel bar joints shall be properly upset, and the surface shall be free of cracks and obvious burns. The crankshaft of the joint axis shall not be greater than 6°, the price shall not be greater than 1/10 of the diameter of the steel bar, and shall not be greater than 2mm.
After the operation, the site should be cleaned up, the fire should be eliminated, and the water in the cooling pipeline should be blown out with compressed air in winter, and the power supply should be cut off.