A stuck or slow cut — especially on tall workpieces or stainless steel — is usually traced to poor flushing by the dielectric fluid, but flushing, electrical parameters and mechanical or contact state all play a part.
1. Check flushing first. Poor flushing defeats everything else. Check dielectric flow and make sure both upper and lower nozzles deliver water at slightly high pressure. Weak flushing worsens debris removal and cutting speed drops noticeably.
2. Check the fluid. Root cause: a fluid that cannot carry away erosion products will stall the cut.
- Emergency fix: add a little dishwashing liquid or raise the fluid concentration.
- Proper fix: switch to a fluid with better flushing performance. In some regions hard water also causes stuck cuts; choose a hard-water-tolerant water-based dielectric.
3. Adjust electrical parameters.
Taking an example — two transistors, 3A, interval 8, width 32, cutting 100mm-tall 45# steel:
- Transistors: two is too few; run almost all of them (or one fewer) as long as the wire does not break.
- Pulse width: can be larger (e.g. 48).
- Current: stabilize around 2.5A.
- Pulse interval: increase moderately.
4. Check wire and contact state. When two machines have identical parameters but one is slower:
- Check whether the wire has been used too long and whether the contact surface is clean.
- Confirm high-frequency and sampling line contacts.
- Confirm conductive block contact.
- Check whether the fluid is too dirty.
5. Check electrical parts.
- Inspect the reversal relay.
- Most feared: a damaged wire feed motor — a motor problem can make the cut stall in reverse.
In short: go through flushing, fluid, electrical parameters, wire/contact and electrical parts in order. Flushing and fluid are the frequent causes; adjust parameters by workpiece height, and deal with mechanical or electrical faults promptly to restore cutting ability.
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