Model family
Submerged Arc Welder Model-Family Variants
A WelderData repair index for MZ, MZ1, MZ2, MU, MZD, MZN and related submerged arc welder variants, focused on choosing the correct power-source, tractor, wire-feed and feedback path before board repair.
Database summary
This WelderData model-family index groups common Chinese submerged arc welder labels that appear in repair manuals and field notes: MZ-1000, MZ1-1000, MZ-400, MZ2-1500, MB-400, MZ2×1600, MU3-2×1000, MZ8-2×1500, MZ9-1000, MZD8-2×1500, MZN8-2×1500, MU-2×300 and MU2-1000.
The value of this index is not the model name alone. Many SAW faults are misdiagnosed because the technician starts from the wrong layer. A symptom may belong to the welding power source, tractor travel, wire-feed control, arc-voltage feedback, flux delivery, contact tip, output cable or work return. Model-family context helps choose the correct evidence path before changing control boards.
Model-family map
Variant groups and repair focus
| Model family | Common meaning in repair records | Primary diagnostic focus |
|---|---|---|
| MZ / MZ1 | Single-wire automatic submerged arc welder or tractor-source set. | Arc-voltage feedback, wire-feed motor, travel carriage, start/stop and power-source enable. |
| MZ2 / MU | Larger or multi-wire submerged arc platforms and special automatic variants. | Multiple wire paths, gantry or tractor movement, source matching and feedback stability. |
| MZD / MZN | Digital-control or variant control families in some repair manuals. | Controller command, source interface, feedback scaling and process-mode selection. |
| ZD5 / ZXC / ZX5 source sets | Power sources paired with submerged arc tractors. | SCR trigger, CV/CC behavior, current feedback, contactor state and output evidence. |
What users usually need
| User symptom | First separation | Next WelderData path |
|---|---|---|
| Tractor moves but there is no weld output. | Separate tractor command from source enable and welding output. | SAW power-source interface routing |
| Wire feeds manually but not during welding. | Separate jog/manual feed from arc-start relay and feedback command. | MZ1 wire-feed feedback control |
| Travel carriage does not move or runs away. | Separate travel motor, direction switch, thyristor trigger and speed setting. | Travel carriage speed control |
| Welding current is unstable. | Separate source output from arc-voltage feedback, wire speed and work return. | ZD5 / MZC fault flowcharts |
| Wire sticks at stop or burn-back is wrong. | Separate stop timing, crater/burn-back setting, wire command and contact tip condition. | MZ-1000 maintenance examples |
How to use this page
Use this page when a repair note or machine plate gives only a family label such as MZ-1000, MZ1-1000, MU2-1000 or MZD8. Do not assume all MZ/MU machines share the same control board. First determine whether the fault belongs to the power-source side, tractor side, wire-feed side or feedback side.