Spot welder popular name: spot welding machine/precision spot welder/energy storage spot welder/ac spot welding machine/high frequency pulse spot welding machine/shenzhen resistance spot welding inverter spot welding machine/welding/microcomputer spot welding machine, dc spot welding/thermocouple spot welding machine, pneumatic spot welding machine/hardware machine tools/battery spot welder/electronic spot welding machine/portable spot welding machine, high precision welding machine/touch/butt welding machine, welding machine with portable spot welder/welding/etc

Spot welding machine according to the material and thickness of the different welding is divided into: high power spot welding machine, precision spot welder, microelectronics spot welding machine

Power generally is 380 v voltage, other spot welding machine is 220 v, generally from the principle of general is divided into storage spot welding machine, ac pulse spot welding machine, the transistor spot welding machine, inverter dc spot welding machine, pure dc spot welding machine.

Spot welding machine according to utility cent, have universal type (gm), special type; According to the number of solder joints welded points at the same time, have a single point, double point, multipoint; Points in the conducting way of unilateral and bilateral; In accordance with the transmission way points, pressurized institutions have a pedal, the motor - CAM type, pressure type, hydraulic type, compound hydraulic jewels (gas); According to the operation of the feature points, the automation, automation; According to the installation method of points, have fixed, mobile or portable (hanging); According to the activity of the electrode welding machine (ordinary electrode) on the moving direction of points and a vertical stroke () electrode a straight line, arc trip; Divide according to the method of power supply, power frequency welder (in 50 Hertz ac power), pulse welding machine, dc pulse welding machine, stored energy welding machine, etc.), inverter welding machine (such as low frequency welder).

When the workpiece and electrode, the resistance of the workpiece depends on its resistivity. Therefore, the resistivity is one of the important performance by welding materials. High resistivity of the metal its poor electrical conductivity, such as stainless steel low resistivity of the metal its conductivity is good (e.g., aluminum alloy). Therefore, generate heat easily when spot welding of stainless steel and heat dissipation, yi and heat dissipation when spot welding of aluminum alloy heat production difficult. Spot welding, the former small current (several thousand amperes) are available, and the latter will have to use a large current (tens of thousands of amp). Resistivity is not only depends on the metal species, but also with metal heat treatment state, processing methods and temperature.

In order to guarantee molten nuclear size and strength of solder joints, welding time and welding current can complement each other in a certain range. In order to obtain a certain strength of solder joints, can be used in a large current and short time (strong condition, also called hard specification), also can use a small current and long (weak conditions, also known as soft specification). Choose or soft hard specification standard, depends on the performance of the metal, thickness and power of the welding machine used. For the different performance and current and the time required for the thickness of the metal, there is a lower limit, when used with this shall prevail.

Electrode pressure between the two electrodes has distinct effect on the total resistance R, with the increase of electrode pressure, R decreased significantly, and increase the size of the welding current is small, can''''t influence caused by R reduce heat production decrease. Therefore, solder joint strength of total and decreases as the pressure welding. The solution is at the same time of increasing welding pressure, welding current.

Due to the electrode contact area decided the current density, resistivity of electrode materials and the relationship of thermal conductivity with heat generation and lost, therefore, the shape of the electrode and the material has a significant influence on the formation of a melt nuclear. As the electrode end of deformation and wear, the contact area increases, solder joint strength will reduce.