1.Spot welding head for mild steel Projection welding of mild steel is widely used. The following table shows the welding conditions of spherical and conical projection welding. 2.Projection welding of coated steel plate Projection welding of coated steel sheet has fewer problems than seam welding, the reason is that the current is current is concentrated on the bumps.Even if the coated metal at the contact is first melted and diffused, there will be ni reduction in current density such as spot welding and seam welding.In addition, due to the large contact surface ans low current density of the plane electrode of projection welding, both the adhesion of the plating layer and the deformation of the electrode are relatively small. 3.Projection welding of PVC plastic surface steel plate This kind of steel plate has an insulating PVC plastic layer on one side, and it can only be welded by single-sided single-point or single-sided double-point welding.In order to protect the adhesive plastic surface from being damaged, it is necessary to use a shorter time for welding.Generally,half a week of electricity is used to control the heat time and heat, even shortened to 1/6 week or use energy storage welder for short time welding.In order to ensure that the plastic-coated surface does not have the same obvious indentation, the steel plate backing plate with the same pattern as the plastic-coated steel plate is usually.

The thermocouple spot welding head is a kind of temperature sensing element, a kind of primary instrument, and the thermocouple directly measures the temperature. A closed loop composed of two conductors with different composition materials. Due to the different materials, different electron densities produce electron diffusion, and after a stable equilibrium, an electric potential is generated. When there is a gradient temperature at both ends, a current will be generated in the loop, and a thermoelectromotive force will be generated. The greater the temperature difference, the greater the current. After measuring the thermoelectromotive force, the temperature value can be known. A thermocouple is actually an energy converter that converts heat energy into electrical energy. The technical advantages of the thermocouple spot welding welding head: the thermocouple has a wide temperature measurement range and relatively stable performance; high measurement accuracy, the thermocouple is in direct contact with the measured object, and is not affected by the intermediate medium; The thermal response time is fast, and the thermocople responds flexibly to temperature change; the measuring range is large, and the thermocouple can continuously measure the temperature from-40 to +1600℃; the thermocouple had reliable performance and good mechanical strength. Long service life and convenien installation.

Butt spot welding heads Is it divided into upper and lower parts. When welding, the welded object is located in the center of the upper and lower parts. Current passes through the welded object and generates heat on the welded object, Sometimes heat occurs primarily through the contact surface of the welded object and the welding head. This depends on which part of the current loop has a large resistance. Micro spot welding head The micro spot welding head is the welding head corresponding to the microelectronic spot welding machine. Its characteristic is that the welding head and the welding machine have now formed a loop. After the current passes through this loop, the heat is generated at the high end of the welding head. The welding head actively generates heat, while the welded object does not actively generate heat.