Feb 18, 2020
Do you have any feeling that the electric kettles are becoming more and more refined and smooth! You may find that the interface of the electric kettle is very smooth, and the transition is very natural. Some people may even mistake it for being integrally formed. This is because the manufacturing process of the electric kettle, especially the welding process, is more advanced than previous electric kettles.
In fact, it is impossible to achieve integrated molding of the electric heating shell. From a production perspective, in the past, integrated molding would cause waste of materials and is not recommended. Now even if 3D laser printing starts to become popular, but the cost is high, and the electric heating shell can not be integrated into the molding at present, so the laser welding machine has become the best processing technology equipment for welding the parts of the electric heating shell.
The ordinary stainless steel kettle consists of five parts: the spout, the lid, the handle, the body, and the bottom of the pot, as shown in the figure. Before we saw the bright and beautiful kettle, it had more than ten manufacturing processes: a common stainless steel plate was processed and cut, then trimmed and stamped into the required shape, then welded and polished, and finally cleaned and packed.
Before the laser welding, generally, the spout and the gripper of the pot are resistance welded, the bottom of the pot and the pot body, and the lid of the pot are argon arc welding, which is almost all of the welding process. Because there is no good fixture cooperation, the quality of the welded product is determined by the skill of the welding master, and the level of production capacity is inseparable from the craftsman. This production mode, which is overly dependent on workers' craftsmanship, is increasingly difficult to meet the market's demand for efficiency and quality.
In addition, the traditional electric kettle welding method has problems such as welding spots and large heat affected areas. The thickness of ordinary daily stainless steel kettles is generally 0.8-1.5mm, which will not exceed 2mm, and some stretched positions will be thinner. In argon arc welding, welding spots appear due to the oxidation of the weld. Because of the large heat affected area, workpieces often have problems such as deformation, cracking, pinholes, undercuts, insufficient bonding force, and internal stress damage after welding. No matter whether the welding spot is too large or other deformation and damage caused by welding, it will bring more difficulties to the subsequent polishing process, so the defect rate will increase accordingly.
The laser welding machine has a small heat affected area. It will not deform for thin materials (0.1-2.0mm), and the welding spots are uniform. The polishing process is reduced, and the defective rate of the finished product can be greatly reduced. The use of optical fiber to transmit laser light can also make use of the flexibility of optical fiber, so that the laser can process the workpiece at any angle, and realize multi-dimensional flexible processing. The optical fiber also has a homogenizing effect on the laser energy, which can homogenize the laser to make the quality of the outgoing laser beam better and improve the welding quality. The laser welding machine can also add a vision system to automatically capture welds, making welding more intelligent, and no longer rely on manual welding technology.