Harbor Freight has a 90 Amp flux wire welder for $99 bucks ...
They suck but they will do the job of welding a door shut well enough to make one an essential part of every American’s survival supplies.
They run on 110 too IIRC so they are very portable and useable under a variety of conditions. Add a small generator and you can cage liberals wherever they are found providing a cage is handy.
Alternately, carry a length of chain in your truck and weld the chain around their neck and to a large stationary object in case you don’t have a cage handy. It’s a temporary solution till you return with a proper cage for the liberal and there is a risk they could be raped and killed by fellow liberals in their shackled state. However this is covered under ‘acceptable losses’ and saves the cage foe use on a still dysfunctioning liberal.