Changsha Xiangjia Metal Materical Co., Ltd.

The hazards of the welding spatter of the  rectangular steel pipe : reducing the welding deposition efficiency and reducing the welding productivity; the spatter is easy to adhere to the weldment and the nozzle, which affects the welding quality, makes the welding labor conditions worse and increases the cleaning time; the welding pool unstable, leading to defects such as rough weld shape. How to prevent splashing from happening? In the following words, we will introduce you five measures. 1. In rectangular steel pipe arc welding, there is a rule between the spatter rate of each diameter welding wire and the welding current: the spatter rate in the small current area is small, and the spatter rate in the high current area is also small, and the middle area has the largest splash rate. Therefore, when selecting welding current, avoid current areas with high spatter rate as much as possible. 2. The extension length of the welding wire should be short, which can reduce the welding spatter

  SSAW steel pipe : It is rolled by low-carbon structural steel or low-alloy structural steel strip at helix angle to form a tube blank, and then welding the tube seam. The specifications are expressed by outer diameter * wall thickness, and the welded pipe shall be ensured that the hydraulic test, the tensile strength of the weld and the cold bending performance must meet the requirements. Advantages of SSAW steel pipe: 1. The same width of strip steel can produce different diameter steel pipes 2. Under the same pressure conditions, the stress of the sprial welded seam is smaller than that of the straight seam, which is 75% to 90% that of the straight seam welded pipe, so it can withstand greater pressure. Compared with the LSAW steel pipe of the same outer diameter, the wall thickness can be reduced by 10% to 25% under the same pressure. 3. The size is accurate, the diameter tolerance does not exceed 0.12%, the deflection is less than 1/2000, and the ovality is less than 1%. Generall

  LSAW steel pipes  are divided into large-diameter LSAW steel pipes and small-diameter LSAW steel pipes according to the range of diameters. Small-diameter LSAW steel pipes are also be called welded pipes. 1. The caliber range of large-diameter LSAW steel pipes The specifications of large-diameter LSAW steel pipes are above 219mm, and the wall thickness is above 5mm. At present, the maximum diameter of double welds can reach 2020mm, and the maximum diameter of single welds can reach 1220mm. 2. The caliber range of small-diameter LSAW steel pipes The minimum diameter of the welded pipe can reach four points, and the diameter is about 20mm. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and sizes. Years of production experience and manufacturing facilities who have a capacity of 200,000 tons per annual will ensure

 Defects that are easy to produce in the welding pipe are pores, hot cracks and undercuts. 1. Bubbles. Bubbles mostly occur in the center of the weld bead. Because hydrogen is hidden in the weld metal in the form of bubbles. Therefore, the measure to eliminate this defect is to remove the rust, oil, moisture and moisture of the welding wire and the weld. Secondly, the flux must be dried well to remove moisture. In addition, it is also very effective to increase the current, reduce the welding speed, and slow down the solidification speed of the molten metal. 2. Sulfur crack (crack caused by sulfur). When welding plates with a strong sulfur segregation zone (especially soft boiling steel), the sulfide in the sulfur segregation zone enters the weld metal to produce cracks. The reason is that the sulfur segregation zone contains low-melting iron sulfide and the presence of hydrogen in steel. Therefore, in order to prevent this, it is effective to use semi-killed steel or killed steel with

  1. Cleaning Grease, dust, lubricants, and organic matter adhering to the surface of the  LSAW steel pipe , usually we use solvents and emulsions to clean the surface. However, the rust, oxide scale, and welding slag on the surface of the steel pipe cannot be removed, so that it needs tools. 2. Tools to remove rust Steel pipe surface oxide scale, rust, welding slag, wire brush can be used to clean and polish the surface treatment. There are two types of tool rust removal: manual and power. Hand tools can reach Sa2 level, and power tools can reach Sa3 level. 3. Pickling Common pickling includes chemical and electrolytic methods. However, only chemical pickling is used for anticorrosion of pipelines. Chemical pickling can able to get a certain degree of cleanliness and roughness on the surface of the steel pipe, which is convenient for subsequent anchor lines. Usually used as a reprocessing after shot blasting (sand). 4. Shot blasting to remove rust The high-power motor drives the blade

  When storing   LSAW steel pipes , some methods are used to increase the stability of the steel pipes, so what should be done? Here, we'll talk about it in detail. 1. When storing LSAW steel pipes, pay attention to ensuring the upper and lower pads. The second is to ensure a ventilation space to avoid reactions during storage; some metal products that should be more careful in storage; 2. It is necessary to choose a suitable environment, like a warehouse. If not, the drainage should be unblocked, and the environment should be clean, and there should be no harmful gases or other dust in the air to avoid affecting the straight seam steel pipe; 3. Different types and specifications of straight seam steel pipes should be stored separately to avoid confusion. Changsha Xiangjia Metal Materical Co., Ltd.  the Steel Pipe Division of ADTO GROUP, is one of the leading manufacturers of steel products in China. We specializes in manufacturing all kinds of steel pipe in various grades and size

 The formula for calculating the weight of the national standard  galvanized rectangular steel pipe . According to the formula, the amount can be calculated. Let's take a look: 4 x wall thickness x (side length-wall thickness) x 7.85 The numerical value, side length and wall thickness are all in mm, and the numerical value can be substituted into the formula. The result is the weight per meter of the national standard galvanized rectangular steel pipe in grams.  E.g:According to the above formula, the weight per meter of 30mm x 30mm x 2.5mm galvanized rectangular steel pipe can be calculated as: 4 x 2.5 x (30-2.5) x 7.85 = 275 x 7.85 = 2158.75 grams, which is 2.16 kg When the wall thickness and side length are in mm as the unit, 4 x wall thickness x (side length-wall thickness) is calculated as the volume of the rectangular steel pipe per meter length, in cubic centimeters, multiplied by the specific gravity of iron per meter The cubic centimeter is 7.85 grams, which is the weight

The maximum wall thickness of the  LSAW steel pipe  can be 50mm, the press of the pressure is limited, and if you need a steel pipe which wall thickness exceeds 50mm, seamless steel pipe can be the only choice. The minimum wall thickness of LSAW steel pipes can be produced to 8mm. The first step is to press the plate into a round shape when produce LSAW steel pipes. Therefore, there are requirement on the wall thickness of the steel plate. If the steel plate is too thin, the press cannot crush the steel plate or it can cause deformation, or pressed into an ellipse. So that minimum wall thickness LSAW steel pipe can be produced is 8mm. The wall thickness is less than 8mm using coiled pipes. The coiled pipes are made by T-welding, which are all section by section. The stitching is different from the straight stitch. Changsha Xiangjia Metal Materical Co., Ltd.  is the leading manufacture in China, has been insisting on product quality as the center and inheriting quality for 18 y