The tape cutting line is the supply unit for the tapes needed to feed the lines. The coils with different widths (1250 and 1500 millimeters) after being prepared, are cut by slitter blades of different widths, depending on the type of product required for production, and the cut strips are wrapped again in coils and after inspection Different types are the initial storage for transfer to the next stage.

Stripped coils are transferred to the next stage of the spiral capacitor for storage. At this stage, the end of the coil inside the spiral capacitor is welded to the beginning of the next coil by the operator and they are ready to enter the forming gates.

At this stage, the sheet passes through 8 gates and gradually assumes a cylindrical shape until the edges of the sheet come close to each other and the cross section becomes circular. In the primary gate, there are sinusoidal molds so that if there is unevenness on the surface of the sheet, it will be smoothed by these molds. Then, the sheet passes through the molds until the fifth gate, up to 60% of the initial cross-sectional area of the pipe, and after passing through the next gates, it forms 90% of the cross-sectional area of the pipe and is ready to enter the welding stage.

In the electric resistance welding (ERW) process, two surfaces are joined by heat and pressure of welding molds. Due to electrical resistance, metals are heated and even melt due to the passage of electric current. Applying electric current with high density in a short time causes the part to be welded to become a paste (before melting) and applying pressure before and during the passage of the current ensures the existence of a continuous electric circuit and during heating The part causes the welding place to be forged. This pressure continues even after the power cut and helps to forge and then cool the welding place. The maximum temperature that can be reached in these processes is usually higher than the melting point of the base metal. After welding, if there is excess welding dust, the surface of the welding place is pleated to remove the excess welding unevenness.

After the welding process, the pipe is inserted into the basin for cooling and is ready to enter the sizing stage.

At this stage, by passing through each gate, the size of the product starts to be modified and close to the expected dimensions. Depending on the type of product and its cross-section (pipe or can), the type of molds in the sizing stage is different. For example, in the production of cans, in the sizing stage, the upper and lower molds of the sizing gates are not round and have an angular shape so that by changing the cross section of the product from tube to can (square/rectangle), they can produce the expected cross section.

Upon entering the track head stage, the product starts to modify the dimensions again so that it reaches the expected final and accurate dimensions at this stage.

At this stage, the manufactured product is cut according to the desired length or the customer’s order and is transferred to the conic work stage.

In this stage, the beginning and end of the pipe is tapered by the device at an angle of 30 degrees and transferred to the final stage, i.e. leak detection test.

All production pipes must be tested for leakage after taper work. According to the standard of the manufactured product, all pipes must be pressurized at least 50 bar and at the desired time according to the standard. During the leak detection test, the pipes are visually inspected by the operator, and in case of rejection, the tested pipes are separated from the rejected pipes. Also, all pressure gauges are periodically calibrated to ensure the correctness of the test.

In this step, depending on the type of product and the packaging recipe, the tubes are inspected and labeled, and the final packaging is done.