Wondering what I am talking about?? well, the topic for discussion is resistance spot welding which is used by many aeronautic and automobile industries as one of the major processes for joining workpieces(metal of course!)... There have been proposals of a lot of ideas for welding and the joining of sheet metals but resistance spot welding by far remains the most cost effective and efficient among them.
In the current time period it has become common to use welding guns which are driven by a servo motor since their performance and output quality are a hell lot better than their predecessors the pneumatically driven welding guns. The accurate control of the servo motors position and torque is what makes these guns a lot more easy to use in the field of work. The position and velocity of the welding guns are determined by the frequency of the pulses which are being sent to the servo motor.
In addition to all these advantages the welding time cycle is reduced when the electric servo is used instead of the pneumatically driven welding guns. The time saved would be less relatively when compared with the pneumatically driven mechanism but when it comes to welding a huge number of spots in a car or another work object then the time saved is tremendous!! Just multiply the time with the number of spots you need to weld you will be amazed.. lets say the time saved is 0.4 seconds for a spot and there are thousands of spots in an automobile, I think you will now get my drift.. As we all know life is always equally balanced if there is something positive about something there has to be a negative!! Nobody is perfect you know!!.. So, the servo mechanism has its own disadvantages, the output force accuracy of the servo gun may be higher than that of the pneumatic gun but it is affected by certain factors like temperature, wear and tear, stiffness etc... I hope this was quite informative .. try going through the block diagrams to get a clear idea of what I was talking about...
By,
Kunal.K.Bajaj & S.Karthik Priyadarshan
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