Strailed steel pipes are a very common steel pipe in life. The application of this pipeline is very wide. I believe many people have heard of this pipeline.So do you know the production technology of straight seam steel pipes?The production process of straight seam steel pipes can be divided into two categories, one is high -frequency straight seam steel pipes, and the other is buried arc welding straight seam steel pipes.These two production processes are different. Let's take a look at the production technology of these two straight steel pipes!
1. Buried arc welding
After the steel plates that will be used to create large -caliber buried arc welding straight seam steel pipes are put into the production line.First perform a full -board ultrasonic inspection, and then use the two -sided surface of the steel plate to use double -sided milling and processing on the surface of the steel plate.Make the two edge surfaces of the steel plate reach the width, parallelity of the plate edge, and the shape of the hill.Then, the pre -adopted offer equipment is used to conduct pre -adopted operations on the edge of the commercial board, so that the edge of the board has a curved curvature.Then, use the JCO molding machine to make us half of the curved steel plate for multiple steps, stamping into a J -shaped shape.In addition, stamped the other half step stamped into a C -shaped shape and become the O -shaped of the final opening.
Make the forming straight seam welded steel pipes and seams and use gas protection welding (MAG) for continuous welding; use the column -to -wire buried arc welding (up to four wires) on the inside of the straight steel pipe to weld;Buried arc welding is welded outside the outside of the straight arc welded steel pipe.After the welding is completed, the first ultrasonic inspection (mainly inspection of welds and the mother material on both sides), the first X -ray examination (check the sensitivity of the detection), the test of the diameter, and the water pressure (water pressurePress test opportunities automatically save records).
Then process the inspection of the inspection of the steel pipes to the size that meets the requirements, and then perform the second ultrasonic inspection, the second X -ray inspection, the tube end magnetic powder test, anticorrosive and coating, and complete the entire processing process.
2. High -frequency welding
High -frequency welding is based on the electromagnetic induction principle and AC charge in the conductor, the adjacent effect, and the vortex thermal effect of the edge of the weld to the melting state, and then squeeze it with a roller to enable the seam to achieve indirect crystals in the seams., To achieve the purpose of welding welding.High -frequency welding is an inductive welding (or pressure contact welding). It does not require welding seam filling, no welding splash, welding thermal affecting narrowing area, beautiful welding molding, and good welding mechanical performance. Therefore, it is subject to the production of steel pipes.Wide application.
The high -frequency welding of the steel pipe uses the skin's skin -tending effect and the neighboring effect of AC power. After the steel (with steel) is rolled and forming, a cross -section disconnected circular tube blank is formed.Or a set of impedance (magnetic rods), an electromagnetic induction circuit is formed at the opening of the impedance and the opening of the duct. Under the action of the skin tendency and the neighboring effect, the edge of the tube's mouth has a strong and concentrated thermal effect, so that the edge of the welded seams can make the edge of the welded seams.After quickly heating to the temperature required for welding, after the pressure roller is squeezed, the metal of the melting state achieves indirect crystal convergence, and a solid docking weld is formed after cooling.
