Introduction Of Ssaw Steel Pipe Related Knowledge

After the production of SSAW steel pipe, it should be stored.If we don’t do some measures to keep its stability, it will rust and be corroded. So we will talk about how to increase the stability of the spiral welded pipe today. Generally speaking, we have followed methods:

1. Small and medium-sized steel, wire rod, rebar, steel pipe with medium diameter, wire and wire rope, etc., can be stored in well-ventilated shed, but must put covering in the upper part of the goods and underlay at the bottom of the goods.
2. Some small steel shape, sheet steel, steel strip, silicon steel sheet, small diameter or thin-walled steel pipe, all kinds of cold-rolled or cold-drawn steel and the metal products with high prices and easy-to-corrode can be stored in warehouse.
3. The ground or warehouse to store spiral steel pipe should choose the place where is orderly and clean, and it is easy to fluently drain away water. It should stay away from the factories and mines that products harmful gases or dust. We also need to remove the weeds and all debris to keep the steel clean on the ground.
4. Large-scale structural steel, steel rail, large diameter steel pipe, forgings, etc. can be opened stack.
5. In the warehouse, SSAW steel pipe should not be stacked with the acid, alkali, salt, cement and other materials that have corrodibility on steel together. Different varieties of steel should be stacked separately, to prevent confusion and prevent contact corrosion.

High production efficiency. On the one hand, the wire length is shortened and the current and current density are increased. As a result, the penetration depth of the arc and the melting efficiency of the welding wire are greatly improved. Generally speaking, the melting depth on one side can reach 20 mm without grooving. on the other hand, due to the thermal insulation of the flux and slag, there is basically no heat radiation loss from the arc and very little welding spatter. Although the heat loss of melting flux is increased, the overall thermal efficiency is still greatly improved.
High weld quality. The slag provides good protection against air and the welding parameters can be stabilized by automatic adjustment. The technical level of the welder is not high, the weld composition is stable and the mechanical properties are good.
Good working conditions. In addition to reducing the labor intensity of manual welding operations, it has no arc radiation, which is a unique advantage of submerged arc welding.

Submerged arc welding is not as flexible as manual welding and is generally only suitable for horizontal positions or small slope welds. Workpiece edge preparation and assembly quality is required, which takes more working time. Since with submerged arc welding, we cannot see the formation of the molten pool and weld seam, so the welding specification must be strictly controlled.

Inferior SSAW steel pipes are prone to burrs because some inferior manufacturers have iron pan equipment. Prime Steel Pipe is positioned as an excellent carbon steel pipe manufacturer and exporter, and we have over 20 years of experience in producing SSAW steel pipe. Therefore, all SSAW steel pipes produced by Prime Steel Pipe have the best quality, and you can choose our spiral welded pipes with confidence. Generally speaking, burrs will scratch the appearance of SSAW steel pipe, and it is easy to break, the tendons are thin and low. And often appear full unsatisfactory phenomenon. The reason is that manufacturers in order to achieve large negative tolerances, waste a few passes before reducing the amount of iron type is small, it is full unsatisfactory. Easy to produce cracks. The reason is that the blank is adobe, adobe porosity, adobe in the cooling process due to thermal stress, cracks, and cracks after rolling.
SSAW steel pipe often has quality problems in production and use. So we need to identify the quality of SSAW steel pipe and test it according to certain ways and performance. Only then can it play an important role in the actual use. So how to identify the counterfeit spiral steel pipe method: in the appearance of the lumpy phenomenon is often present. Generally speaking, the overall effect of weighing will be better, mainly taking into account the cumulative error and probability theory of this issue. The lumpy surface is caused by severe wear and tear, irregular irregular defects in the appearance of spiral steel pipe. As a result of shoddy SSAW steel pipe manufacturers in pursuit of profits, often rolling the most standard. The appearance is prone to scarring.
Smooth and neat at the end of the top crop, high-quality SSAW steel pipe with uniform composition. And shoddy material due to poor quality, the cut end often has the naked eye, that is, uneven, and no metallic luster. And because the counterfeit manufacturers cut off the small head, the head and tail will appear large ears. The size of the inner diameter fluctuates greatly. The reason is that the l steel temperature is not stable Yin and Yang surface. The composition of the steel is not uniform. Folding refers to the appearance of spiral steel pipe to form a variety of folding lines, this defect is often throughout the longitudinal direction of the product. Folding is due to the pursuit of high efficiency manufacturers, the amount of depression is too large, the occurrence of ear, folding occurs in the next rolling, folding after the product bending will crack, thick-walled spiral steel pipe strength decline.
The temperature of the pseudo-material rolling is not standard, there is no metallic luster. There is a light red or similar to the color of pig iron. The cross-section is oval. The reason for this is that the manufacturers in order to save information, scrap rolling before the first two pressures are too high, the strength of this rebar is greatly reduced, and does not meet the specifications of the size of the rebar. Reason 2: Fake spiral steel pipe material is not uniform and has many impurities. Manufacturers of shoddy materials guide the equipment is simple and easy to stick to the steel, these impurities bite into the rolls and easily produce scars.

The large diameter double sawn steel pipe factory needs to test the product after the production is completed, especially its pressure resistance. Because we usually use it on the ground, it is required to have good resistance to pressure, so how to test it.
First, the two ends of the tested steel pipe are sealed with an end seal device, and then injected with low-pressure water. In the process of water injection, the air in the pipe is discharged through the exhaust valve. After the low-pressure water is filled, high-pressure water is injected into the pipe through the pressurization device to pressurize the gas. The specified test pressure is reached. After reaching the specified test pressure, the pressure is maintained for a predetermined period of time. If there is no leakage or deformation, the pressure is released.
Products that have been pressure tested can be used to ensure the effectiveness of the spiral pipe. Of course, it is necessary to carry out relevant anti-corrosion measures according to its use environment to ensure its effectiveness and longevity.

The use of SSAW steel pipe is relatively high and widely used, how should we choose the best, and pay attention to the quality when choosing.
The first method is a more professional testing method, that is, by testing the strength of the pressure vessel. It is common to use atmospheric pressure and water pressure to detect, through this way you can detect the working condition of SSAW steel pipe under pressure working environment, you can also detect the tightness of spiral steel pipe. Generally take the atmospheric pressure detection, because this is relatively high security, and if the water vapor pressure detection through the words, you need to remove the water on the spiral pipe, too much trouble.
The second method is also relatively simple, is through surface observation. With the naked eye to find spiral steel pipe in the welding and size of the problem, if necessary, you can also use standard samples and products for comparison to find the problem. Generally speaking, the regular steel pipe company is more perfect in production, on the other hand, hit the metal pipe, if the sound is crisp and the echo is not very dirty. Then it is called the latest selection of steel pipe, rather than scrap recycling.
These two methods are commonly used, you can choose a way to test. The more secure way is the best for the regular manufacturers to reduce the abuse in the process of use.