Resistance welding sequences and Definitions.
Figure 2. Explaining with a line drawing of a typical sequence welding. He "welding time" at the top of the time intervals of operation of the welding machine are described, while the line "temporizadores de control" at the bottom it refers to the configuration of the control dial welding. The following definitions may help in understanding this drawing:
For Soldado: is the time interval between initial application of force on the electrode and the first application of current. Note that this is the definition of the process. The definition of control is the time interval initiation sequence and the start of the current to weld. The time delay is necessary to grip the welding current until the force of the grip reaches its desired level.
Soldier: is the time during which the current It applies to welding work for the soldier. It is measured in cycles of line voltage as are all timing functions.
A cycle is 1/60 a second power system 60 Hz.
Time is the time during which the electrode force remains at work after the last pulse of the welding current ceases. Maintenance time is necessary to allow the weld nugget to solidify before releasing welded parts.
The welding current is the current in the welding circuit during the performance of soldier. The amount of welding current is controlled by both;
1-. Adjusting the transformer tap switch determines the maximum amount of welding current available:
2-. Second, the percentage of current control determines the percentage of the power available for use for welding.
Force electrode It is the result of the air pressure applied to the air piston connected directly to the head. The actual amount of force the electrode depends on the effective air pressure, the weight of the head, and the piston diameter. Most welders have side tables Machine, tabulating air pressure compared to the clamping force of the electrode. If your machine does not contain this information you can use the following formula:
Electrode force = .78 x D2 x P
D is the piston diameter in inches
P is the air pressure in pounds per square inch.
Electrode force is in pounds.
This does not allow dead weight and friction. It may be necessary, when the electrode pressure is changed to a valve quite another, to re adjust the speed control valve. Too slow one approach wastes time and may require contraction time much longer. Too fast impacts of an approximation of the electrodes, and can damage the electrode holder or head. When projection welding, has a high impact can damage these projections and may result in a poor quality weld although the other things are correct.
The solenoid valve is an electronically operated valve in the line connected to the compressor air cylinder welding machine. When the control voltage is applied to the sealing valve opens, allowing compressed air to enter the cylinder to develop strength of the electrode.