I have an older 220 V Marquette wire feed MIG welder, built by BlackHawk and sold back in the day as a body shop tool. It is model #12-185. It is currently fitted with 0.030 wire, and was welding fine on a lap-joint of approx 1/8 & 3/16 materials, when it suddenly lost arc, wire feed continued with speed un-changed.
Have checked the following;
1- supply voltage is 235 VAC
2- Diodes appear new (except for some dust inside the cabinet) I disconnected all 4, and verified that they were still functional, with all still directional @ approx 450-480 ohms. White heat grease still present on sink joint of each, and no signs of arcing or heat related issues inside the cabinet anywhere.
3- Liner to tip ohms out at less than 2-3 ohms. (same for wire in tip)
4- Ground clamp & cable clean, with no signs of heat distress, and ohms out at less than 1 ohm end-to end.
5- It has a "crydom D2440" solid state relay, whose input reads between 1 & 3 VAC, and drops to near zero when triggered. The output is zero, but jumps to ~240 VAC when momentarily triggered.
Looking for some thoughts from some the experienced folks here.
Thanks in advance for any ideas,
Steve
Have checked the following;
1- supply voltage is 235 VAC
2- Diodes appear new (except for some dust inside the cabinet) I disconnected all 4, and verified that they were still functional, with all still directional @ approx 450-480 ohms. White heat grease still present on sink joint of each, and no signs of arcing or heat related issues inside the cabinet anywhere.
3- Liner to tip ohms out at less than 2-3 ohms. (same for wire in tip)
4- Ground clamp & cable clean, with no signs of heat distress, and ohms out at less than 1 ohm end-to end.
5- It has a "crydom D2440" solid state relay, whose input reads between 1 & 3 VAC, and drops to near zero when triggered. The output is zero, but jumps to ~240 VAC when momentarily triggered.
Looking for some thoughts from some the experienced folks here.
Thanks in advance for any ideas,
Steve