How to improve the success rate of erw pipe
From the analysis data of ERW steel pipe scrapping, it can be seen that the roll adjustment process plays a very important role in the production of welded pipes
. That is, in the production process, if the rolls are damaged or worn seriously, some rolls in the unit should be replaced in time, or a certain type of straight seam welded steel pipe should be continuously produced in sufficient quantities, and the entire set of rolls should be replaced.
When replacing the welded pipe, the roll needs to be adjusted accordingly to ensure the quality of the welded pipe. On the contrary, if the roll is not adjusted properly, it is easy to cause defects such as torsion, lap welding, edge undulation, indentation, scratches and even large ovals on the surface of the welded pipe on the protrusion and the pipe body.
The following is an introduction to the operation method of roll adjustment that should be mastered when changing rolls.
First of all, if you want to change the specifications of ERW steel pipes, generally speaking, you should replace the whole set of rolls. The steps to adjust the roll shape are: firstly pull the steel wire at the inlet and outlet of the unit out of the center line, adjust the pass shape of each frame on the center line, and make the forming line meet the technical requirements.
In order to ensure the welding quality of ERW steel pipes, the forming rolls, guide rolls, squeeze rolls, and sizing rolls need to be adjusted once after the rolls are replaced as required, and then focus on adjusting the closed-cell type, guide rolls, and sizing rolls. Squeeze rollers. The role of the guide roller is to control the direction of the weld seam and the height of the bottom line of the welded pipe, reduce the edge extension, control the rebound of the edge of the tube billet, and ensure that the weld seam enters the extrusion roller straight and without deformation.
In short, during the welding process of the welded pipe, when the welder is running at a low speed, the welder must pay close attention to the rotation of the rollers of each part of the welded pipe, and adjust the rollers at any time. Ensure that the welding quality and process size of the welded pipe meet the specification requirements.