Welding Of Stainless Steel Pipe

In recent years, there has been growing pressure on carmakers to increase fuel efficiency due to growing concerns about environmental issues. Stricter and more restrictive regulations have brought technical challenges to industrial production and material processing.

    These trends include lower emissions, lighter body, and longer service life. The progress of materials processing has brought a unique opportunity for stainless steel pipe production field. Specifically, manufacturers are required to produce such parts, they must have a lighter weight, but must still have anti-corrosion characteristics and meet the strength requirements. In addition, the space limitations of the body more emphasis on the importance of formability.

    Typical applications include exhaust pipes, fuel tubes, nozzles and other components. In the production of stainless steel tube, the first form of flat steel strip, and then make its shape into a circular tube. Once formed, the seams of the pipe must be welded together. This weld greatly affects the formability of the parts. Therefore, it is important to choose the right welding technology to get the welding profile that meets the stringent testing requirements in the manufacturing industry.

    It is no doubt that tungsten gas shielded arc welding (GTAW), HF (HF) welding, and laser welding have been used in the manufacture of stainless steel tubes.

    High Frequency Induction Welding In high-frequency contact welding and high-frequency induction welding, the supply of current equipment and equipment to provide pressure is independent of each other.

    In addition, both methods can be used to use the magnet, which is a soft magnetic element, is placed inside the tube body, it helps to converge on the edge of the steel welding flow. In both cases, the steel strip is cut and cleaned, rolled up and then sent to the weld point. In addition, the cooling agent is used to cool the induction coils used in the heating process. Finally, some coolant will be used in the extrusion process. Here, a great force is exerted on the extruded pulley to avoid porosity in the weld area; however, the use of greater extrusion pressure will result in more burr (or bead).

    Therefore, specially designed cutters are used to remove burrs inside and outside the pipe. One of the main advantages of high frequency welding process is that it can process the steel pipe at high speed. However, it is typical in most solid-phase forging joints that high-frequency welded joints are not easily reliably tested using conventional non-destructive technology (NDT). Weld cracks may appear in thin areas of low strength connections, which cannot be detected using conventional methods, and may lack reliability in some demanding automotive applications.