Large diameter spiral steel pipe manufacturer

The price market of large-diameter spiral steel pipe manufacturers is in sync with the world. Quality and life coexist. Cangzhou Tianze Pipeline Co., Ltd. is a professional manufacturer of large-scale thermal insulation and anti-corrosion steel pipes designated by Hebei. It has the most advanced anti-corrosion and thermal insulation steel pipe production equipment in the country. Our company has always been at the forefront of the industry and guided the continuous development of industry technology. At present, the company presides over and participates in the formulation and revision of national standards, industry standards, and local standards. At the same time, the company has obtained a total of authorized invention patents and utility model patents through years of accumulation of independent innovation, all of which rank among the best in the industry. Our company is a large QB anti-corrosion spiral pipe manufacturer. Our company specializes in the production of QB anti-corrosion spiral welded steel pipes. Anti-corrosion spiral welded steel pipes. Spiral steel pipes are widely used. QB welded spiral steel pipes are used in tap water projects. Spiral steel pipes are used in drinking water projects. Large-diameter spiral steel pipes are used. QB spiral steel pipes are professional anti-corrosion spiral pipes for drinking water. Our factory keeps a large inventory of steel pipes all year round.
Spiral pipe production process
The raw material is strip steel coil, welding wire and flux. They must undergo strict physical and chemical inspections before being put into use.
The head-to-tail butt joint of the steel strip is made by single-wire or double-wire submerged arc welding. After being rolled into a steel pipe, automatic submerged arc welding is used for repair welding.
Before forming, the strip steel is leveled, trimmed, planed, surface cleaned, transported and pre-bent.
Electric contact pressure gauges are used to control the pressure of the cylinders on both sides of the conveyor to ensure smooth conveying of the strip.
Adopt external control or internal control roller forming.
The weld gap control device is used to ensure that the weld gap meets the welding requirements. The pipe diameter misalignment and the weld gap are strictly controlled.
Both internal and external welding use American Lincoln welding machines for single-wire or double-wire submerged arc welding to obtain stable welding quality.
The completed welds are inspected by online continuous ultrasonic automatic flaw detector to ensure the non-destructive testing coverage of the spiral welds. If there is a defect, it will automatically alarm and spray mark the production workers accordingly to adjust the process parameters at any time to eliminate the defect in time.
Use an air plasma cutting machine to cut the steel pipe into individual pieces.
After being cut into individual steel pipes, each batch of steel pipes must undergo a strict first inspection system to check the mechanical properties of the welds, the chemical composition, the fusion status of the steel pipes, and the surface quality of the steel pipes. They must also undergo non-destructive testing to ensure that the pipe making process is qualified before they can be officially put into production. .
The areas with continuous sonic flaw detection marks on the welds will undergo manual ultrasonic and radiographic re-examination. If defects are found, they will be repaired and then undergo non-destructive inspection again until it is confirmed that the defects have been eliminated.
The steel strip butt welds and the tubes of the T-shaped joints that intersect with the spiral welds have all been inspected by radiography or radiographs.
Each steel pipe undergoes a hydrostatic test and adopts radial sealing. The test pressure and time are strictly controlled by the steel pipe water pressure microcomputer detection device. Test parameters are automatically printed and recorded.
The mechanical processing of the pipe end allows the end face verticality, bevel angle and blunt edge to be accurately controlled.
Weld seam treatment
The spiral steel pipe feeds the strip into the welded pipe unit and rolls the strip through multiple rollers to gradually roll it up to form a circular tube blank with an opening gap. Adjust the reduction amount of the extrusion roller to make the welding The seam gap is controlled to ~ and both ends of the welding joint are flush.
.If the gap is too large, it will cause proximity effect, reduced eddy current, insufficient heat, poor inter-crystal bonding of the weld, resulting in lack of fusion or cracking.
.If the gap is too small, the proximity effect will increase, the welding heat will be too high, causing the weld to burn, or the weld will form deep pits after extrusion and rolling, affecting the surface quality of the weld.
After the two edges of the tube blank are heated to the welding temperature, they form common metal grains that interpenetrate and crystallize under the squeeze of the extrusion roller, ultimately forming a strong weld. If the extrusion force of the spiral steel pipe is too small, the number of common crystals formed will be small, and the strength of the weld metal will decrease. Cracking will occur after stress is applied. If the extrusion force is too large, the molten metal will be squeezed out of the weld, which will not only reduce the strength of the weld but also It will produce a large number of internal and external burrs and even cause defects such as welding seams.
Features of Spiral Steel Pipe Technology
. During the forming process, the steel plate deforms evenly, with small residual stress and no scratches on the surface. The processed spiral steel pipe has greater flexibility in the size range of diameter and wall thickness, especially in the production of high-grade thick-walled pipes, especially small and medium-diameter thick-walled pipes. It has advantages that other processes cannot match, which can satisfy users' needs for spiral steel pipes. More requirements in terms of specifications.
b. The use of advanced double-sided submerged arc welding technology can achieve welding at the best position and is less prone to defects such as misalignment and incomplete penetration, making it easy to control the welding quality.
. The quality inspection of steel pipes ensures that the entire process of steel pipe production is under effective inspection and monitoring to effectively ensure product quality.
. All equipment in the entire production line has the function of networking with the computer data acquisition system to realize real-time transmission of data from the central control room to the technical parameters of the production process.
Principle requirements for stacking
The principle requirements for stacking spiral steel pipes are to stack different types of materials according to specifications on the premise that the stacking is stable and safe. They should be stacked separately to prevent confusion and mutual erosion
/> It is prohibited to store items that corrode steel around the spiral steel pipe stack
The bottom of the spiral steel pipe stack should be elevated, solid and flat to prevent the material from getting damp or deformed
The same kind of materials should be stacked separately according to the order in which they are put into storage
br/> There must be wooden pads or stone strips underneath the spiral steel pipes stacked in the open air. The stacking surface is slightly inclined to facilitate drainage, and attention should be paid to the straight placement of materials to avoid bending deformation
The stacking height of spiral steel pipes must not exceed the manual work. Mechanical work shall not exceed. The stack width shall not exceed.
There should be a certain channel between stacks. The inspection channel is generally . The access channel depends on the size of the material and the transportation machinery. It is generally .~.
When stacking angle steel and channel steel in the open air, they should be placed flat, i.e. with the mouth facing down. I-beams should be placed vertically with the groove surface of the steel not facing upward to avoid water accumulation and rust
The bottom of the stack should be raised if the warehouse has a sunny cement floor. But if it is a mud floor, it must be raised...~. If it is an open-air venue, the cement floor should be raised. ~. The sand and mud surface should be raised. ~.