I am finally able to post. I have been waiting for activation for a long while. I am experienced welder and fabricater. Started welding in 1981. Made a living at it until 2010 when I changed jobs and doing industrial maintenance now. I am starting to forget the technical stuff about welding,but can still weld . I bought a 200dx in 2014 ,and it went unused until just over a month ago. I needed to make a weld on aluminum. I started to make the weld ,and before the puddle formed ,my welder stopped working. Disappointed is a understatement. I sent it in for repair and have not received it back . I do have to say that the customer service so far has been great. I hope that this don't happen again.