Dryer Plug to Arc and Ebrew

Ok folks. I have an old dryer plug that I need to be able to plug an arc welder into so I can finish my brew stand, and later I'd like to make it so I have enough 240 there to run both my HLT and BK off of at the same time. Please help.

First off, here are a few pics. The top one is the wall plug that is existing. The second is the arc welder. What do I need to make the welder plug in? I have the old male end off of the dryer.

After I use the plug to weld (assuming I can go to the box store and buy a female plug to put my male from the dryer into), can I wire it using these directions to a spa panel in order to run two elements at the same time?

https://www.homebrewtalk.com/f170/240v-3-wire-drier-ground-neutral-confusion-287679/

My neighbor who is an electrician says to use dryer plugs on the welder.
You are more likely to find that type in a garage if you need to do some portable welding.

Just jam it in there

Make sure your wire and amps are rated for your welder. I had the same idea and my electrician had me upgrade my wire from 10g to 8g for a full 50 amp circuit back to my main panel.