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Welding Seam Treatment and Process Characteristics of Spiral Pipe

Date:2020-12-08    keywords:spiral pipe, welding seam treatment, process characteristics
Weld processing:
1. If the gap is too large, the proximity effect will be reduced, the eddy current heat will be insufficient, and the weld will have poor intercrystalline joints, resulting in non-fusion or cracking.

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 being extruded and rolled, which will affect the surface quality of the weld.

After the two edges of the tube blank are 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, 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 strength of the weld, but also produces a large number of internal and external burrs, and even causes defects such as weld overlap.

Main technological characteristics of spiral steel pipe(SSAW steel pipe):

a. During the forming process, the steel plate deforms uniformly, the residual stress is small, and the surface does not produce scratches. The processed spiral steel pipe has greater flexibility in the size and specification range of diameter and wall thickness, especially in the production of high steel grade thick-walled pipes, especially small and medium-diameter thick-walled pipes. More requirements on spiral steel pipe specifications.

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

c. Perform 100% quality inspection on steel pipes, so that the entire process of steel pipe production is under effective inspection and monitoring, which effectively guarantees product quality.

d. All equipment of the entire production line has the function of networking with the computer data acquisition system to realize the instant data transmission, and the central control room will control the technical parameters in the production process.

Tips: ASTM A53 covers seamless and welded steel pipe with nominal wall thickness. The surface condition is usually black and hot-dipped galvanized. ASTM A53 is produced mainly for pressure and mechanical applications, and is also used for transport of steam, water, gas line pipes.

ASTM A53 Grade B is the grade in ERW high frequency welded pipe, divided into A and B grades. 

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