Welding points of spot welding in resistance welding

01 Selection method of welding specification

The welding effect of high current, high voltage and short-time energization is the best.

02 How to determine the nugget

The size of the nugget determines the spot welding strength, which is generally determined by the following formula.

Iron d=(4-5)t

Aluminum d=3(3t+1.5)

03 Minimum welding spacing

The welding distance is small, the welding current of the second point is shunted to the nugget of the first point, and the flame core of the first point changes small, so the interrogation distance should be as large as possible.

Iron p=(10~15)t

Aluminum p=3(3t+1.5)

04 Minimum overlap

The amount of overlap is small, and internal spray will occur when the power is turned on, which will cause the board to burn, so it should be as large as possible.

L=2d

L=(1.2-3)*welding spacing

05 Welding conditions for different plate thicknesses (iron)

In principle, the thin plate is used to determine the conditions. When the ratio exceeds 1:3, considering the thermal balance, it should be determined on site Welding Specifications.

06 Welding conditions of 063 plates of the same thickness (iron)

Taking into account the tightness between the plates, the pressure and welding power can be moderately increased, and there is a problem of shunting.The welding distance can be 30%, and the overlap amount can be unchanged.

07 Electrodes

During spot welding, the current density and the size of the nugget change with the size and shape of the electrode tip.Therefore, when selecting electrodes, the wear management of electrodes is also very important, and continuous welding The number of points is largely determined by the cooling effect of the electrode tip. R-shaped end shape when welding aluminumfor best results, the electrode tip should be ground about every 10 points of welding.