Resistance welding machine advantages and disadvantages:
Resistance welding machine has the following advantages:
1. When the nugget is formed, it is always surrounded by a plastic ring, the molten metal is isolated from the air, and the metallurgical process is simple.
2, the heating time is short, heat concentration, so the heat affected zone is small, deformation and stress is also small, usually do not have to arrange correction and heat treatment process after welding.
3, do not need welding rods, welding wire and other filler metals, and oxygen, acetylene, argon and other welding materials, welding cost is low.
4, simple operation, easy to implement mechanization and automation, improve the working conditions.
5, high productivity, and no noise and harmful gases, in mass production, can be assembled together with other manufacturing processes to the assembly line, but the flash butt welding due to spark splatter, need to be isolated.
Resistance welders have the following disadvantages:
1, lack of reliable non-destructive testing methods, welding quality can only rely on the destructive test of the process sample and weldment to check, and rely on a variety of monitoring technology to ensure.
2, point, seam welded lap joints not only increase the weight of the components, and because of the formation of the angle between the two plates around the nugget, resulting in joints of low tensile strength and fatigue strength.
3, equipment power, mechanization, high degree of automation, so that equipment costs increase. Maintenance is difficult, and the commonly used high-power single-phase AC welder is not conducive to the normal operation of the power grid and requires separate power distribution.
The main resistance welding methods are spot welding, seam welding, projection welding and butt welding.