LSAW Steel Pipe

    Piercing tool of seamless steel pipe is following below:     1) Roller: It is the main drive deformation tool. Usually the roller is composed of inlet cone, rolled belt (also called compression belt) and outlet cone. Its function:     a. Inlet cone: Into the tube blank and achieve tube perforation.     b. The exit cone is to achieve hair wall reduction, levelling of the capillary surface, uniform capillary wall thickness and complete capillary return.     c. Rolling belt: play a transition from the inlet cone to the exit cone.     2) Guide: It is a fixed external deformation tool, not only plays the guiding role of the tube blank and the capillary tube, making the rolling line stable, but more important is the closed hole outer ring, limiting the lateral deformation of the capillary tube - expanding diameter, play a role in controlling the diameter of the outer diameter of the capillary tube. The guide plate has t...

    UT, which is short for Ultrasonic Test, is widely used for testing finished steel pipe. We all know that UT test is a must in steel pipe industry, but do you know what are the advantages of UT test? In the article, we will introduce the advantages of UT test.     Ultrasonic testing has lots of advantages in the application of pipeline inspection:     Non-destructiveness is the most important advantage. On the one hand, the inspected steel pipe doesn’t need to be cut or exposed to damaging chemicals component, which means the inspection won’t have any influence on its future usage. On the other hand, it does no harm to operators, leaving no potential risk for operators. It is both safe for the pipes and operators.     Strong penetrating power makes sure it has a wide detection range. Any defects can be detected. It is useful and efficient for steel pipe inspection.     High sensitivity features allow it to precisely and quickl...

    ERW steel pipe, which is short for electric resistance welded steel pipe, is widely used for low pressure liquid delivery, such as water, gas and oil field, oil drilling and machinery manufacturing, etc.     Today, we’ll talk about most common seen surface treatment for electric resistance welded steel pipe.     First comes fusion bond epoxy, also known as FBE coating, which is widely used to protect steel pipe used in pipeline construction from corrosion. Working temperature for FBE coated steel pipe can up from 180℃ to 250℃.     Then comes varnish coating. Varnish coating is the most general surface treatment for steel pipe. General varnish coating is just an oil-liked coating on pipe surface and have strong anti-corrosion effect. For industrial steel pipes, varnish steel pipes is needed.     Another surface treatment for ERW steel pipe is PE. Both PE and 3PE is common seen ways. PE coated steel pipe is widely used for liqu...

    Seamless elbow is manufactured by the seamless steel pipe, through hot push, press or extrusion processes, no seam on the elbow body. Welded elbow is manufactured by welded steel pipe, same processes with seamless elbow.But there is a seam on the elbow body.     How to make seamless elbow     The production of seamless elbow mainly adopts the hot push technology. Hot push elbow forming technology is to use special elbow push system core machine, mold and heating device, to set on the mould of billet in pushing forward movement, under the impetus of the machine in motion is heated and hole enlargement and forming process. Hot push elbow deformation characteristics are based on volume before and after plastic deformation rule of metal materials determine the pipe diameter, pipe diameter elbow diameter, through the core module and control the deformation of the process, make the inner arc compressed metal flow, the compensation to other parts of the th...

    Socket Weld (SW) fittings are defined in the ASME B16.11. As with socket weld, a pipe is inserted into a recessed area of the fitting. Both the pipe and the fitting are square cut, with no need for beveled end or preparation other than cleaning the outside, which allows easy welding and installation.     Butt weld (BW) fittings are defined in the ASME B16.9. They are welded at their ends to pipe end, with the same thickness as pipes. The end of butt weld fittings shall be beveled.     Application     Socket weld (the fillet weld) resists around 1/2 the strength of butt welding. So it is mainly used for small pipeline (Small Bore Piping) with diameters NPS 2 or smaller.     Butt weld keeps better strength, good for high pressure or high temperature pipelines. So it is used when a welded joint with strength not lower than that of the base metal itself is needed.     Feature     Socket weld is easy to ins...

    Carbon steel can be divided into 10# 20# A3 Q235A 20g Q345B 20g 16Mn ASTM A234 ASTM A234 ASTM A403 et, and the elbow part made of these materials can be called carbon steel elbow.     According to the angle: 45°, 90°, 180°, these three commonly used elbows, and other engineering needs, can be specially customized such as 60 ° or other angles.     Connection with carbon steel pipe : welding, flange connection, screw connection, socket connection and other forms.     According to the process form can be divided: welding elbows, stamping elbows, casting elbows and so on.     Uses: Connect two tubes to change the direction of the tube, turning to 45° or 180° and 90° or other angles.     Manufacturing standards: national standard, American standard, Japanese standard, German standard, and Russian standard.     The basic process of a carbon steel elbow is to first weld a multi-prism ring shell with a polygon...

    What are the possible causes of stress concentration in welded joints?     a. Process defects in the weld, such as pores, slag inclusions, cracks, and incomplete penetration, where the stress concentration caused by cracks and incomplete penetration is severe.     b. Unreasonable weld seams, such as butt weld seams that are thicker and oversized, can create significant stress concentrations.     c. Unreasonable design of welded joints, such as abrupt changes in the cross section of the joints, butt joints with cover plates, etc., can cause serious stress concentrations. Improper welds may also cause stress concentration.     What are the adverse effects of stress concentration on the welded structure? how to improve?     1. Excessive stress may even cause cracks in the solder joints, causing potential safety hazards.     2. Deformation of components, such as the rack of some equipment, will be processe...