john , that is true in 1976 we were stove piping across turnagain arm in cook inlet derrick barge (DB300) 85 men per shift working top side , the 798 foreman gave me till next shift to remove 400 amp miller from lay barge , luckily a pipe barge pulled in on next tide , or it would have to splash , it was the only miller , he just had 2 cut outs . he said he wouldn't have his men use a bad machine , they were expert welders . i hooked up 1 of 2 back up lincoln 400 amps welders that were on board . they had only 2 weld repairs that i know of . and yes lots of salt water corrosion on that job . at times the wind was blowing water over the top of the derrick of the lay barge at times . i think they still make a stainless 400 amp welder for off shore duty , if they haven't made much changes to the rest of the controls that would be my choice of welder . thanks for your post , brings back memories that job was one of the most hard but fun jobs i was on .i was on the ( Db300 and DB25 for 4 months ). good luck . willie