Hey Max! I have two ignitron tubes that were used to switch some spot welders. I doubt that they were faster than relays, based on the amount of mercury that they had to evaporate to switch on. Of course I never saw the trigger portion of the system. They are water cooled, with fair sized water lines. Just another useless bit of information.

 

Yes, I worked with many of those, they were used for precise No of cycles when switching, generally fired by a thyratron. and had water cooled jackets.
They were also used for seam welding for e.g two halves of a automotive gas tank, the electrodes were rotating copper wheels and the ignitrons fired in bursts as the copper electrode wheels moved the tank flange through!
.Another method of firing them was a from a decatron tube counter.
1950/60 technology!

 

How do dogs relate to this?

Signature comments are not part of the subject !!!

 

I am still not clear if you require an automatic periodic activation or initiated manually?

manually, with the pedal what is on the right.

 

You could look at a 555 monostable trigger mode!
Adapting the Triac circuit in Fairchild app not AN3006. but using the zero crossing series of Triac.
You could closely operate the time on with required number of cycles.
Of course this could be quite a trivial for a small 8pin PicMicro !

 

Thabk for your advise. But I already installed a standar spotwerder control. Of course your proposal is better, I always heard about cycles in spotwelding, but for my porpuse, I think this circuit will done

 

OK, but I am not really clear on what you want then??

 

The operation being a spotwelder is certainly very different from the very limited bit of information in the first posting. At that point I see that the TS had already decided where the problem was.

 

Sorry, maybe I didn´t explain myself properly, I don´t really speak english very well.

I wanted to make a DIY spotwelder based on a modified microwave oven transformer. At the beginning I only need one automation so since it was simple, I thought a simple timer was enough, but maybe I could use arduino. But as I was advancing in the project I realised I need more steps, so in the end I decided to do it with arduino, because I don´t have enough electronics knowledge and I was to be here asking every component and everything.

 

OK, so the goal is a semi-automatic spot welder machine. With using a reworked microwave oven transformer it will probably not deliver more than 800 watts to weld with. That will work for welding solder tabs onto batteries, a very useful function.

 

At the beginning I only need one automation so since it was simple,

Keep in mind that in a production setting, the spot welder electrode is typically water cooled!

 

Keep in mind that in a production setting, the spot welder electrode is typically water cooled!

Based on post #29, that it uses a reworked microwave transformer, I seriously doubt this welder will be used in actual production.

 

Based on post #29, that it uses a reworked microwave transformer, I seriously doubt this welder will be used in actual production.

....Although it might be capable with the right adaptation, it mirrors the suspended hand operated versions exactly!
This one is hand pressure lever operated.