Dennis Jensen
New Member
- Messages
- 1
- Location
- Denmark
Hi All,
I have a older unbranded 250 Amp mig welder, which not has been used for several years. I took it out to see if it still works but sadly it's not striking any arc. The wire gets red hot/ sparks a tiny amount, but that's all.
Things that I checked/ replaced:
- All connections cleaned/checked for corrosion
- New rectifier installed since i had a spare, also double checked diodes, they all work (only flows one direction)
- Wire feeds perfect
- Checked voltage under "no load" at the tip and ground while feeding wire slowly. There are seven steps on the machine, checked all steps and the voltage lower/raises when changing step. Highest voltage was around 50V DC and lowest around 25-30V DC.
When I'm trying to arc on highest setting, the voltage is around 50V DC, but as soon the wire is connected to the work piece, the voltage drop to around 2-4V DC measured at the tip and ground . As mentioned the wire only gets red hot/sparking very weak..
Any thoughts, ideas or other comments would be appreciated.
BTW. I know a new MIG welder is not a fortune, but I see it, as more to be a small project, if nothing expensive has to be changed, off course
Best Regards
Dennis, from Denmark
I have a older unbranded 250 Amp mig welder, which not has been used for several years. I took it out to see if it still works but sadly it's not striking any arc. The wire gets red hot/ sparks a tiny amount, but that's all.
Things that I checked/ replaced:
- All connections cleaned/checked for corrosion
- New rectifier installed since i had a spare, also double checked diodes, they all work (only flows one direction)
- Wire feeds perfect
- Checked voltage under "no load" at the tip and ground while feeding wire slowly. There are seven steps on the machine, checked all steps and the voltage lower/raises when changing step. Highest voltage was around 50V DC and lowest around 25-30V DC.
When I'm trying to arc on highest setting, the voltage is around 50V DC, but as soon the wire is connected to the work piece, the voltage drop to around 2-4V DC measured at the tip and ground . As mentioned the wire only gets red hot/sparking very weak..
Any thoughts, ideas or other comments would be appreciated.
BTW. I know a new MIG welder is not a fortune, but I see it, as more to be a small project, if nothing expensive has to be changed, off course
Best Regards
Dennis, from Denmark