Welding Technique Parameters for Galvanized Steel Spot Welding
Galvanized steel is a type of steel that has been coated in zinc to protect it from corrosion and improve its longevity. Spot welding is one of the most common types of welding for galvanized steel, due to its ability to quickly join two pieces of metal without the need for additional fasteners. This makes it a popular choice for applications such as automotive body manufacturing and HVAC ducts.
In order to successfully spot weld galvanized steel, certain parameters must be followed to ensure a strong, durable weld. Below we will discuss the main welding parameters for spot welding galvanized steel, including current, voltage, spike time, and force.
Current: The welding current is the most important parameter for spot welding galvanized steel. The correct current should be determined according to the thickness of the steel being welded. For example, for 0.5mm to 1.5mm steel, a current of 2,000 amps should be used. For 1.5mm to 2.5mm steel, a current of 2,250-2,400 amps should be used. It is also important to keep in mind that higher currents will reduce the welding time, resulting in a stronger weld.
Voltage: The welding voltage is also an important parameter when spot welding galvanized steel. The voltage should typically be set between 18-20 volts, although this may vary depending on the thickness of the steel being welded. For example, for 0.5mm to 1.5mm steel, a voltage of 18 volts should be used. For 1.5mm to 2.5mm steel, a voltage of 20 volts should be used.
Spike Time: The spike time is the time it takes for the welding current to reach its maximum value. The spike time should be set according to the thickness of the steel being welded. For 0.5mm to 1.5mm steel, a spike time of 0.15-0.20 seconds should be used. For 1.5mm to 2.5mm steel, a spike time of 0.25-0.30 seconds should be used.
Force: The welding force is also important for spot welding galvanized steel. The force should be set according to the thickness of the steel being welded, ensuring a strong joint. For 0.5mm to 1.5mm steel, a force of 10-12kg should be used. For 1.5mm to 2.5mm steel, a force of 13-15kg should be used.
These are the main parameters that must be followed when spot welding galvanized steel. It is important to ensure that the parameters are followed accurately to ensure a strong, durable weld. To ensure the best results, it is recommended to use a welding machine designed specifically for spot welding galvanized steel.
By following the above parameters and using the correct equipment, spot welding galvanized steel can be successfully performed, resulting in a strong, durable, and long-lasting weld.
