The advantages and disadvantages of resistance welding

Resistance welding is the workpiece through the electrode pressure, the use of current through the resistance thermal contact surface and the adjacent area of the connection welding.


The advantages of resistance welding
1, nugget, always by the plastic ring, molten metal and air separation, metallurgical process is simple.
2, heating time is short, concentrated heat, it is a small heat-affected zone, deformation and stress is small, usually do not need to arrange to correct the welding and heat treatment process.
3, no wires, rods and other filler metal, and oxygen, acetylene, hydrogen and other welding materials, welding low cost.
4, simple operation, easy to mechanization and automation, improved working conditions.
5, high production efficiency, no noise and harmful gases, in high-volume production, with other production processes can be edited to the assembly line. But due to flash butt spatter spatter, need to be isolated.


Resistance welding shortcomings
1, the lack of reliable non-destructive testing methods, the quality of the welding process can only rely on destructive test pieces and workpieces to test and rely on a variety of monitoring techniques to ensure.
2, point seam welding lap will not only increase the weight of the structure, but also because of the formation of a corner of the two plates, the joint tensile strength and fatigue strength are very low.
3, high degree of mechanization of electrical equipment, high degree of automation, higher equipment costs, maintenance is more difficult, and commonly used high-power single-phase AC welder is not conducive to the balanced operation of the power grid.