Views: 8 Author: Site Editor Publish Time: 2021-12-22 Origin: Site
How much do you know about the weld gap of thin-walled spiral steel pipe?
1. If the gap is too large, the proximity effect will be reduced, the eddy current will be insufficient, and the weld will not be fused or cracked due to poor intercrystalline joints.
2. If the gap is too small, the proximity effect will increase, and the welding heat will be too large, causing the weld to burn; or the weld will form a deep pit after extrusion and rolling, which will affect the surface quality of the weld.
After the two edges of the steel, tube billet is heated to the welding temperature, under the extrusion of the squeeze roller, a common metal crystal grain is formed to infiltrate and crystallize each other, and finally, a firm weld is formed. If the extrusion force of the spiral steel pipe is too small, the number of common crystals formed will be small, and the weld metal strength will decrease, and cracks will occur after the force is applied; if the extrusion force is too large, the molten metal will be squeezed out of the weld. Not only reduces the weld strength, but also produces a large number of internal and external burrs, and even causes defects such as weld overlap.
It can be seen that the weld seam control of the spiral steel pipe is also one of the factors for the quality control of the spiral steel pipe.