Resistance welding is a combination of workpiece pressure exerted by electrodes, and current is used to generate welding through the thermal contact surface and adjacent areas of resistors.


Advantages of Resistance Welding
1. Gold nuggets are always surrounded by plastic rings. Molten metal and air are separated. Metallurgical process is simple.
2. The heating time is short and the heat is concentrated. It is a small heat-affected zone with little deformation and stress. Normally, it is not necessary to correct after welding and heat treatment.
3. There are no filler metals such as wire and electrode, and welding materials such as oxygen, acetylene and hydrogen, so the welding cost is low.
4. Simple operation, easy to realize mechanization and automation, improve working conditions.
5. High productivity, no noise and harmful gas. It can be edited to assembly line together in mass production and other manufacturing processes. However, due to spark spatter in flash butt welding, isolation is needed.


Defects of Resistance Welding
1. Lack of reliable non-destructive testing methods, the quality of welding process can only depend on destructive test samples and workpieces to test and rely on various monitoring techniques to ensure.
2. Spot weld overlap not only increases the weight of the structure, but also reduces the tensile strength and fatigue strength of the joint due to an angle formed between the two plates.
3. The high mechanization and automation of power equipment make the cost of equipment higher and the maintenance more difficult, while the commonly used high-power single-phase AC welding machine is not conducive to the balanced operation of the power grid.