Welcome to the forum, could you please elaborate your problem a bit further?
The only problems that come to mind are, either the line voltages drop during the welding operation. Check line voltage when welding. Or the transformer may not be generating the required voltages.
Hi AMP, thank you for your speedy reply. As requested by you, I will elaborate on the problem I have with my machine: It is a Cemont TX 165 Lift Tig Inverter. It can also do ordinary Flux Coated stick welding (Arc). The problem I have is that it suddenly started losing its Arc strength while building-up a bearing journal on a gearbox shaft? After several attempts at different current settings I gave up. It would seem like it wanted to strike a good arc but immediately lose the arc. The Agents who sold me the machine 20 years ago had a look at it and said that the electronic P.C. board was faulty and that it was a SEALED board so nothing could be done. He also said that it has built-in thermal O/load so I could not have overheated it. They suggested I try a new variable resistor (rheostat). I had the existing one checked and it was O.K. I checked the Capacitors (6 off) O.K. I then decided to clean all the P.C. boards that were accessible, lightly with a toothbrush and noticed an improvement. It now holds an Arc but not really at full strength. There is an electrical diagram but it does not indicate much at all. I have searched the internet and tried contacting CEMONT themselves but all to no avail. The machine is like new and has mainly worked D.I.Y. I really like this machine and the reason I bought it was because I actually saw one in action at a factory that I worked for & saw the hammering it could take without a single problem, in fact there were 2 of them in action. I would appreciate any help/advice you can give. Yours sincerely, Charles Whittal (Chaz)