The electrode pressure of the battery pack automatic spot welding machine has a significant effect on the total resistance R between the two electrodes. As the electrode pressure increases, R decreases significantly, while the increase in welding current is not large, and it cannot affect the decrease in R. Heat production is reduced. Therefore, the strength of the solder joint always decreases as the welding pressure increases. The solution of the spot welding machine is to increase the welding current while increasing the welding pressure. The influence of current on heat generation is greater than both resistance and time. Therefore, it is a parameter that must be strictly controlled during the welding process. The main reason for the current change caused by the spot welding machine is the fluctuation of the grid voltage and the change of the impedance of the secondary circuit of the AC welding machine. The impedance changes are due to changes in the geometry of the loop or due to the introduction of different amounts of magnetic metal in the secondary loop.

    For a DC welding machine, the impedance of the secondary loop has no significant effect on the current. When the workpiece and the electrode are constant, the resistance of the workpiece depends on its resistivity. Therefore, the resistivity is an important property of the material to be welded. The metal with high resistivity is Metals with poor conductivity (such as stainless steel) and low resistivity have good conductivity (such as aluminum alloy). Therefore, it is easy to produce heat but difficult to dissipate heat when spot welding stainless steel, and it is difficult to produce heat but easy to dissipate heat when spot welding aluminum alloy. When spot welding, the former can use a small current (a few thousand amperes), while the latter must use a large current (a few thousand amperes). Million amps). The electrical resistivity not only depends on the type of metal, but also on the heat treatment state, processing method and temperature of the metal.

Preparation work before starting the automatic spot welding machine

(1) The workplace must maintain air circulation to prevent users from lacking oxygen due to the use of working gas.

(2) Do not stack flammable materials in the workplace to prevent fire.

(3) Check whether the shell of the welding machine is grounded and whether the cable is damaged.

(4) Check whether the connection points of the welding machine are loose and whether there are equipment burned due to poor contact.

(5) Confirm whether there is gas in the protective gas and whether the pipeline is leaking.

Automatic spot welding equipment operation and related operations

(1) Install the electric heating gas pressure reducer as required

(2) It must be preheated for 5-10 minutes before use;

(3) Slowly open the valve on the gas cylinder (at a speed of about 5 degrees/second). At this time, it can be observed that the pointer of the pressure gauge slowly rises, and then stops on a suitable scale.

(4) Turn on the air switch of the electrical box of the equipment to power on the equipment, and check whether the electrical box and the fuselage are leaking.

(5) Check whether the indicator light on the side of the electrical box is normal. If abnormalities are found, the source must be drained and the corrosive medium is damaged.

(6) If you notice any abnormality during operation, please stop the operation immediately. Notify the equipment maintenance personnel to continue using it only after the handling is normal.

Downtime

(1) Close the gas valve on the steel cylinder, release the residual gas in the pressure reducer, and reset the pressure gauge pointer on the pressure reducer to zero.

(2) Press the stop button and turn off the power switch and air source switch in turn;

(3) Completely clean the machine and the ground to ensure that the site is tidy.

(4) Avoid contact between welding cables and metal objects on the ground to prevent short circuits in the output of the welding machine.

ACEY provides battery pack spot welding machine and sales-service.