Fusion Message Board

In this space, visitors are invited to post any comments, questions, or skeptical observations about Philo T. Farnsworth's contributions to the field of Nuclear Fusion research.

Subject: Re: Home Made Spot Welder
Date: Jun 21, 8:33 am
Poster: Don Harris

On Jun 21, 8:33 am, Don Harris wrote:

>All sounds fine, but two points might work against you here.
>1. The soldering gun may not be insulated well enough on the input side to handle high pulse voltages.
>2. A really superior SCR would be needed to handle the discharge firing along with some snubbers and other anti kickback protection circuitry. Looking at ratings for the SCR seems simple. In practice, the 1000 volt plus pulse at 100 or more peak amps into a totally inductive load is a duanting task for the survival of the small silicon pellet switch. Regardless, I would think 80 joules should be the absolute limit of the stored energy.
>40 joules might be better with a superior output transformer.
>Naturally, let us know how it works out.
>Richard Hull

Thanks for the comments Richard. I was just wondering, do you know how the commercial welders
handle the pulse switching.

Maybe some sort of gas tube thyratron would be more appropriate.