Requirements of spiral submerged arc welded pipe hot rolled strip

Spiral submerged arc welded pipe also has its own shortcomings, the spiral pipe section as a large number of pipeline fluid, such as the transmission of oil, natural gas, gas, water and some solid materials such as pipes. The same low bending strength compared to other steel and solid bars, an economical section steel, is widely used in the manufacture of structural and mechanical parts such as drill pipe, drive shaft, bicycle frame and steel scaffolding.

Selection Index of Spiral Submerged Arc Welding Steel Tube Die Casting Machine

According to the spiral submerged arc welded pipe corrosion mechanism, has put forward a variety of protective measures, this protection can basically be divided into the following types:

The utility model comprises a square top support, a middle and bottom of the square steel support, a connecting bolt, a support block, a support sleeve, an end and a protection block in the middle of the square steel support. The package support structure of the invention is simple and has a large carrying capacity, reduces the transportation cost and increases Production capacity.

In the spiral submerged arc welded pipe production test, there is no detection of spiral pipe through the wall of a large hole magnetic flux leakage detection method. Spiral coil method for the detection of high-speed steel, for many years widely used in spiral steel quality inspection, especially the tightness testing of rebar. In use proved that the ferromagnetic spiral tube is difficult to get stuck in crack-like defects, so a high standard of ET, using the probe coil et method.

Quality control of straight seam steel pipe before welding

3) Once again, clean the welding area management. Cleaning QA weld zone, water, oil, rust and dirt oxide film, which is to prevent the occurrence of external weld defects play an important role. 4) Select the appropriate welding method, the welding test should be implemented before the principle of welding.

3) Once again, clean the welding area management. Cleaning QA weld zone, water, oil, rust and dirt oxide film, which is to prevent the occurrence of external weld defects play an important role. 4) Select the appropriate welding method, the welding test should be implemented before the principle of welding.

Spiral pipe in the production of the wrong side, many of the factors in the production practice, often by the wrong side of the error and leaving the pipe degradation. Therefore, the reasons for the occurrence of helical misalignment and preventive measures are necessary. 1. Poor side banding is another important reason for poor health.

Extend the diameter of the straight seam steel pipe to increase the dimensional accuracy and improve the distribution of stress in the steel pipe to the internal and external weld 100% ray Inspection by the Industrial TV Image Processing System to ensure detection sensitivity X-ray inspection. Straight seam welded steel pipe is adopted after the weld is formed, and continuous welding is carried out by using gas shielded welding (MAG).

Reduce the elbow material: cast iron, stainless steel, alloy steel, malleable iron, steel, non-ferrous metals and plastics. Fittings: Direct welding (the most common method) flange welding joints, hot melt connection, threaded connection, socket coupling.

Spiral pipe 1 specification analysis, uneven wall thickness: wall thickness can not be the same purpose in the wall thickness of the phenomenon exists in the cross-sectional and longitudinal tubular body, that is uneven thickness. In order to control such unevenness, the allowable index of uneven wall thickness specified in some steel standards generally does not exceed 80% of the wall thickness tolerance (implemented after mutual negotiation).

Mainly in the spiral pipe size deviation straightness, roundness, uneven wall thickness.

Transport or protection for external spiral steel pipe is mainly for spiral pipe export spiral pipe packaging and packaging methods, spiral pipe, mainly because the exit of the sea, in order to facilitate the handling of general packaging, packaging spiral is divided into the following forms: 1 Bundles, such as bundles, coils, coils 273 219, 7 beams, 7 beams. Both ends of the sling, easy to lift. 2, box packaging, is the use of angle steel, square tube, welded into a box channel, open it, and the size of the container, such as handling loading and unloading FCL.

1, corrosion-resistant. Polyethylene is an inert material that, in addition to a few strong oxidizers, can withstand the erosion of various chemical media.

Spiral pipe is strip by roller, spiral spiral direction, and then through the capacitor for double submerged arc welding. Spiral welded pipe production process, prone to welding and missed welding many wrong edges and so on. However, under these conditions, trachoma is the most difficult to handle spiral steel butt weld.

Spiral submerged arc welded pipe production, forming and welding are carried out at the same time, so the stability of welding quality is good or bad, forming an indivisible. Forming tight when tight loose, "pouting", loose within the loose tight loose within the local error from the side shift, squeeze thick side panels, missing cutting, waves, burrs and conical irregular pores, resulting in poor and Weld undercut, burning, porosity, slag and other defects form. Therefore, we found that we must adjust the forming instability in time.

*Project:Spain Natural Gas Pipeline Project *Product Name:EWR/SSAW *Specification:GR.B; 48” *Quantity:600MT *Year:2015 *Country: Spain *Application:Gas transmission

Spiral pipe factory should be carried out before the mechanical properties test and flattening test, and the flaring test, to meet the standards. Straight seam steel quality inspection methods are as follows: 1, on the surface, that is visual inspection. Visual inspection of welded joints is a straightforward process, but widely used test methods are an important part of product testing with major defects and variations on the surface of the welded dimension. Usually with the naked eye, using standard models, gauges and test tools, such as magnifying glass. If the weld surface defects, weld defects may exist inside.

(1) Pipeline peak load demand due to the user's natural gas consumption is very uneven, frequent pipeline pressure fluctuations, alternating stress steel to withstand large pipe will expand the defects in alternating stress, if there is more choice , The probability of welding defects high, spiral welded pipe, the safe operation of the pipeline will not be guaranteed.