Roll welding machine does not belong to melting welding equipment, right

【Summary Description】 Fusion welding equipment Roll welding machine does not belong to melting welding equipment, right It is right that the roll welding machine does not belong to the melting welding equipment. Roll welding machine belongs to resistance welding (resistance welding), not fusion welding (melting pole welding). Roll welding, also known as circumferential seam welding, is a method of welding workpieces with a pair of roller electrodes instead of cylindrical electrodes for spot welding. The welded workpieces move between the rollers to produce sealed welds with nugget overlapping each other. AC pulse current or amplitude modulation current is generally used, and three (single) phase rectifier, medium frequency and high frequency DC current can also be used. Roll welding is widely used in thin plate welding of sealed containers in oil drums, cans, radiators, aircraft and automobile fuel tanks, rockets, and missiles. The general welding thickness is within 3mm of the veneer. Principle of roll welding machine The adjustable stroke cylinder is used to pressurize to avoid collision damage of upper and lower electrodes. Using three-phase stepless speed electrode drive, welding speed adjustment is convenient and stable. The ingenious and reasonable internal structure reduces the heat generated by the weakening of the welding performance caused by the silver bearing bush rotating conductive excellent contact. Minimize the loss of power conversion. The seam of seam welding consists of a welding spot, which is divided into roll spot welding or airtight seam welding according to the core melting overlap. The formation process of each solder joint is the same as spot welding, there are three stages of pressure, heating and melting and cooling crystallization, but it is quite different from spot welding. Because there is inevitably a shunt phenomenon, the distribution of current field and thermal field in the welding zone has its own characteristics; and the roller that transmits pressure and is heated by electricity continuously rotates to change the welding position, so that the distribution of current field, thermal field and the crystallization characteristics of the melting zone are related to the speed of the change position. What are the characteristics and characteristics of laser deep penetration welding equipment As far as the laser itself is concerned, it is only a device that can generate a parallel beam with good directionality as a heat source. If it is guided and effectively processed and then shot to the workpiece, its input power has a strong compatibility, so that it can better adapt to the automation process. In order to effectively implement the welding, the laser and other necessary optical, mechanical and control components together to form a large welding system. The system includes a laser, a beam delivery assembly, a device for handling and moving the workpiece, and a control device. This system can be simply manual handling and fixing of workpieces by the operator, or it can include automatic loading, unloading, fixing, welding and inspection of workpieces. The overall requirement for the design and implementation of this system is to obtain satisfactory welding quality and high production efficiency. Features and advantages of laser deep penetration welding. Features:(1) High aspect ratio. As the molten metal forms around the cylindrical high temperature steam chamber and extends toward the workpiece, the weld becomes deep and narrow. (2) Minimum heat input. Because the temperature of the source cavity is very high, the melting process occurs very fast, the heat input to the workpiece is very low, and the thermal deformation and heat affected zone are very small. (3) High compactness. Because the small holes filled with high-temperature steam are conducive to the mixing of the fusion pool and the escape of gas, resulting in the formation of pore-free fusion welding. The high cooling rate after welding is easy to make the weld microstructure fine. (4) Strong weld. (5) Precise control. (6) non-contact, atmospheric welding process. Advantages:(1) Because the focused laser beam has a much higher power density than the regular method, the welding speed is fast, the heat affected zone and the deformation are small, and it can also weld difficult materials such as titanium and quartz. (2) Because the beam is easy to transmit and control, and does not need to replace the torch and nozzle frequently, it significantly reduces the downtime and auxiliary time, so the load coefficient and production efficiency are high. (3) Due to the purification effect and high cooling speed, the weld is strong and the comprehensive performance is high. (4) Due to the low balance heat input and high processing accuracy, reprocessing costs can be reduced. In addition, the dynamic cost of laser welding is also relatively low, which can reduce production costs. (5) easy to achieve automation, the beam intensity and fine positioning can be effectively controlled.

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