The spot welding machine adopts the principle of double-sided double-point overcurrent welding. During work, the two electrodes pressurize the workpiece to make the two layers of metal form a certain contact resistance under the pressure of the two electrodes, and the welding current flows from one electrode to the other. Instantaneous thermal welding is formed at the two contact resistance points, and the welding current flows from the other electrode along the two workpieces to this electrode to form a loop, without harming the internal structure of the workpiece being welded.
The process of spot welding is to turn on the cooling water; clean the surface of the weldment, after the assembly is accurate, send it between the upper and lower electrodes, and apply pressure to make it in good contact; the current is heated when the contact surface of the two workpieces is locally melted, forming Nugget; keep the pressure after power off, make the nugget cool and solidify under pressure to form a solder joint; remove the pressure and take out the workpiece. Spot welding process parameters such as welding current, electrode pressure, energization time, and electrode working surface size have a significant impact on welding quality.
With the rapid growth of China's economy and consumption in recent years, as an important part of China's welding industry, special-shaped welding machines have been widely used in various industries due to their good sealing and bright patterns. Chemicals, cosmetics and pharmaceutical industries It has become an important market for special-shaped welding machines.
With the improvement of consumers' living standards, the demand for special-shaped welding machines will increase rapidly. In particular, the rapid growth of the decoration market provides more opportunities for special-shaped welding machines. Shaped welding machine has great potential for future development.
China's special-shaped welder industry has now formed a complete special-shaped welder industrial system including printing and coating iron, can making, lid making, and barrel making. In recent years, China's special-shaped welding machine industry has entered a period of rapid development.
The spot welder uses the high temperature arc generated by the positive and negative poles in an instant short circuit to melt the solder and the material to be welded on the electrode to achieve the purpose of combining them. The structure of the spot welding machine is very simple. To put it plainly, it is a high-power transformer that converts 220V AC power into a low voltage and high current power source, which can be DC or AC. Electric welding transformers have their own characteristics, that is, they have the characteristics of sharp voltage drop.