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Welder Selection for Current Limiting



I'd like to ask the group a question on the selection of 
a welder for pole pig current limiting.  At this time I have 
started the assembly of my power cabinet, which will be in 
need of a means of current limiting.  The selection of a 
welder is where I am hesitating right now.  I do not know if 
all brands of welders provide the appropriate design features 
to do a good job.  I presently understand that some use a 
form of a shunt plate system, similiar to a neon transformer 
in order to create an adjustable current limiting.  I was 
looking at a flyer on a Lincoln Model AC-225 welder and there 
was no mention of how they chose to accomplish the current 
limiting.  It  looked like a nice unit, about the size that I 
could hide from the wife (just kidding).  It appeared to have 
a switch that functioned (by feel) more like a tap switch, 
for various output voltages from the secondary.  Might anyone 
have already reviewed various manufacture's designs? I wonder 
which brands would be good for Tesla work.  Model numbers 
would be great.  Thanks in advance for any comments.