Brief introduction, production technology, process characteristics and stability of metal spiral pipe

Metal spiral pipe is an important product, which is widely used in many fields of building materials industry. It is made of rolled strip steel through multiple processes, which has excellent stability and durability advantages. Then, let's take a look at some words and pictures of metal spiral pipes related to Bian Xiao. We will give you a detailed introduction of the metal spiral pipe, as well as the text and picture information about the production process, process characteristics and stability.

Brief introduction of metal spiral pipe

Spiral steel pipe is a spiral seam steel pipe made of strip steel coil, which is extruded at room temperature and welded by automatic double-wire double-sided submerged arc welding process.

Second, the production process of metal spiral pipe

(1) Raw materials are strip steel coil, welding wire and flux. Before putting it into use, we must go through strict physical and chemical inspection.

(2) End-to-end butt welding of strip steel, using single-wire or double-wire submerged arc welding, and repairing welding by automatic submerged arc welding after being rolled into steel pipes.

(3) Leveling, trimming, planing, surface cleaning, transportation and pre-bending of the strip steel before forming.

(4) The electric contact pressure gauge is used to control the pressure of the oil cylinders pressed on both sides of the conveyor, thus ensuring the smooth transportation of the strip steel.

And (5) adopting external control or internal control roll forming.

(6) Weld gap control device shall be adopted to ensure that the weld gap meets the welding requirements, and strictly control the pipe diameter, offset and weld gap.

(7) Single wire or double wire submerged arc welding is used for internal welding and external welding to obtain stable welding quality.

(8) All welds are tested by online continuous ultrasonic automatic flaw detector, which ensures the nondestructive testing coverage of 100% spiral welds. If there is any defect, it will automatically give an alarm and spray the mark, so that the production workers can adjust the process parameters at any time and eliminate the defect in time.

(9) air plasma cutting machine is adopted to cut the steel pipe into single pieces.

(10) After each batch of steel pipes is cut into a single steel pipe, it must go through a strict first inspection system to check the mechanical properties, chemical composition, fusion status, surface quality and nondestructive testing of the steel pipes to ensure that the pipe-making process is qualified before it can be officially put into production.

(1 1) The parts marked by continuous acoustic flaw detection on the weld shall be re-examined by artificial ultrasonic and X-ray. If there are defects, nondestructive testing shall be conducted again after repair until it is confirmed that the defects have been eliminated.

(12) The butt weld of strip steel and the pipeline where T-joint intersects with spiral weld shall be inspected by X-ray TV or film.

(13) Each steel pipe has undergone water pressure test, and the pressure is sealed radially. The microcomputer detection device for steel pipe water pressure strictly controls the test pressure and time. Test parameters are automatically printed and recorded.

(14) pipe end processing, accurately control the verticality, bevel angle and blunt edge of the end face.

Third, the technological characteristics of metal spiral pipe

Main technical features of spiral steel pipe:

a.？ In the forming process, the deformation of the steel plate is uniform, the residual stress is small, and there is no scratch on the surface. The processed spiral steel pipe has greater flexibility in the size and specification range of diameter and wall thickness, and has incomparable advantages in producing high-grade thick-walled pipes, especially small and medium-sized thick-walled pipes. Can meet the user's more requirements for spiral steel pipe specifications.

b.？ Using advanced double-sided submerged arc welding technology, welding can be realized in the best position, and defects such as wrong edge, welding deviation and incomplete penetration are not easy to occur, and the welding quality is easy to control.

c.？ Carry out 100% quality inspection on steel pipes, so that the whole process of steel pipe production is under effective inspection and monitoring, and the product quality is effectively guaranteed.

d.？ All the equipment in the whole production line has the function of networking with computer data acquisition system to realize real-time data transmission, and the technical parameters in the production process are monitored by the central control room.

Four, how to increase the stability of spiral steel pipe?

1) Small and medium-sized steel bars, wire rods, steel bars, medium-caliber steel pipes, steel wires and wire ropes can be stored in a well-ventilated shed, but they must be covered and padded.

2) The warehouse can store some small steel products, thin steel plates, steel belts, silicon steel sheets, small-caliber or thin-walled steel pipes, all kinds of cold-rolled and cold-drawn steel products and metal products with high price and easy corrosion.

3) The site or warehouse for storing spiral steel pipe products should be in a clean and well-drained place, away from factories and mines that produce harmful gases or dust. Weeds and all sundries on the site should be removed to keep the steel clean.

4) Large section steel, rails, humiliating steel plates, large-diameter steel pipes and forgings can be stacked in the open air.

5) Materials corrosive to steel such as acid, alkali, salt and cement in the warehouse shall not be stacked together. Different kinds of steel should be stacked separately to prevent confusion and contact corrosion.

6) The choice of warehouse should be based on geographical conditions. Generally, ordinary closed warehouses are adopted, that is, warehouses with walls on the roof, tight doors and windows and ventilation devices.

7) The warehouse should be ventilated in sunny days, closed and moisture-proof in rainy days, and always maintain a suitable storage environment.

Above, we have introduced four aspects of metal spiral pipe in detail, namely, the brief introduction of metal spiral pipe and the text and picture information of production technology, process characteristics and stability. Through understanding, we know that the metal spiral pipe plays an extremely important role in many fields, and its processing technology is complex and the storage conditions are demanding, so users need to master certain professional knowledge to play the role and effect of the metal spiral pipe.