The ESAB LHF 630 is a welding rectifier of transformer build, made for covered electrodes and for air arc gouging. You set the current from 80 A to 630 A, the machine gives 630 A at a 35% duty cycle, 475 A at 60% and 400 A at 100%. The supply is 400 or 415 V in a three phase system.
What this machine is for
This is a power source for thick electrodes, including 6 mm in diameter and larger, and for multi layer welding on heavy structures. 400 A at a 100% duty cycle lets you work without breaks through the whole shift, and the reserve up to 630 A you use for gouging with a carbon electrode, that is for taking out faulty welds and for preparing edges before welding. The range from 80 A also covers thinner electrodes for fills and for repairs.
The documentation points this model to shipyards, mines and steel structure plants. The machine handles every type of coating: basic, rutile and cellulosic, that is also electrodes for pipelines run from the top down. The steady direct current also lets you weld with the TIG method with lift arc ignition, when you need to add a precise bead without moving the equipment.
The transformer build with a rectifier bridge means there are no IGBT modules, so the machine takes dust, metal filings and damp better than an inverter. This is equipment for a shop in which grinders work next to it, and the conditions are far from a clean assembly bay.
Features and equipment
- Transformer construction with a rectifier bridge: a simple build without sensitive power electronics, resistant to grinding dust and filings and to voltage spikes in the mains.
- Current up to 630 A: reserve for air arc gouging and for welding with electrodes of large diameter.
- Stepless current adjustment from 80 A: one machine handles thin electrodes for repairs and thick ones for multi layer welds.
- Prepared for remote control: you correct the current at the structure, without walking back to the source, which counts on large tanks.
- Work with every type of coating: basic, rutile and cellulosic electrodes.
- TIG mode with lift arc ignition: the steady direct current lets you add a precise bead without a separate source.
- Trolley with large wheels: you roll the machine over an uneven shop floor.
Technical data
| Brand | ESAB |
|---|---|
| Type | welding rectifier, transformer build |
| Maximum welding current | 630 A |
| Current at 35% duty cycle | 630 A |
| Current at 60% duty cycle | 475 A |
| Current at 100% duty cycle | 400 A |
| Adjustment range | from 80 A to 630 A |
| Supply voltage | 400 or 415 V, three phases |
| Processes | MMA, air arc gouging, TIG with lift arc ignition |
| Electrode diameters | up to 6 mm and larger |
| Remote control | possible after a controller is connected |
What to watch out for
This is a transformer machine, so it weighs its own and draws more current from the mains than an inverter of similar power. The 400 or 415 V supply needs a power socket and a circuit matched to the draw at 630 A, and for gouging you also need compressed air and a separate holder for carbon electrodes. The trolley with wheels makes rolling around the shop easier, but for loading onto a vehicle you need a pallet truck or a ramp.
The source description does not list cables, a torch or a remote controller, so confirm the content of the set and the cable lengths before you buy. With gouging at high currents the wear of consumable parts grows fast, count that into the cost of the work.
This unit is sold
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