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The whole machine is controlled by computer and PLC programming controller, with a high degree of automation. It can weld hot-rolled ribbed, cold-rolled ribbed, hot-rolled round, cold-rolled round and other materials, with wide adaptability. According to the user's electricity consumption, it can be welded in one or several times, with great flexibility. The unit is designed as a detachable structure, which is convenient for specification adjustment and maintenance. The welding system of transformer, thyristor, upper and lower electrodes adopts forced water cooling and is equipped with flow protection device, so that the unit can work continuously and reliably. The pressure of the welding pneumatic system is steplessly adjustable, which can quickly respond to the change of steel bar specifications; the welding pressure is uniform and consistent to ensure the quality of all welding points. When welding standard shaped mesh, there is no need to adjust the position of the upper and lower electrodes, so that it does not take time to change the spacing price. Greatly increase the actual rate.