Electric resistance welding

electric resistance Welding

Today we are going to discuss resistance welding. The resistance welding process is a pressure welding process in which heavy current is passed through the area of the interface of metal. A resistance welding process is a group of welding processes where fusion is done by heating obtained from resistance of the work to the flow of electric arc.

As we know that in the electric arc welding, we use just a high current to produce the heat but don't use pressure but in this resistance welding process the pressure is very important to weld the metal.

Electric resistance welding operation

The pressure is applied at the point of joint, the heat "H", is generated by passing the high current through two pieces of metal which are touching to each other, for electrical current, where current "I" can be 3000 to 100,000 Amps with a voltage of 1to 25volts as per the job.

Where (H∝I²RT), Where H=Heat, I=Electric current in Amps and Tis denoting to Pressure.time of the fraction is few seconds. Using pressure we produce heat for welding. And the heat that is generated and where the metal is given equally to H∝I²RT, so it is the expression to get the heat that the product produced by resistance welding is exactly.CURRENT:-Now we will discuss the expression of the getting heat which is produced by the resistance welding that how much the current is provided and what is the voltage is provided to the distance melting. In the resistance welding.

The current is provided for a few kilowatts clue ampere and the voltage ranges from one to 25 volts, and force is normally applied before and during and after the flow of current. The flow of current is to avoid acting between the surface and to force the weld metal during post hitting, the necessary pressure that varies which is from pressure is varied from 30 to 60 Newton per mm square.

Types of Electric resistance welding

Now we will discuss the common types of resistance welding, Resistance welding can be classified as follows:-

Spot welding
Seam welding
Projection welding
Flush Butt welding
Resistance Butt welding
Percussion welding

VARIABLES ELECTRIC RESISTANCE WELDING:-In the resistance welding process commonly these variables are considered.

Current
Welding time
Welding machine characteristics
Condition of machine and electrodes
Condition of materials
Pressure

Advantage of the Electric resistance welding process

Fast productivity
No filler material required
High skill is not required
Dissimilar metals can be welded

The disadvantage of the Electric resistance welding process

Welding Machine cost is comparatively high
Maintenance work required skilled personals.
For some materials, special surface preparation is required

CONCLUSION
Although the Resistance welding process has some limitations but also its productivity is so fast and it is very suitable for high productivity.
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