Kemppi X5 Fastmig 400, used MIG/MAG welder

Kemppi X5 FastMig 400 is a modular MIG/MAG power source with an MMA mode. At a 60% duty cycle the machine gives 400 A, and 350 A it pulls without a break. You set the wire feed speed from 0.5 to 25 m/min, the power source itself weighs 39 kg, and the housing has class IP23S.

What this machine is for

This is a power source for plants that run continuously at high currents: heavy industry and machine building, steel and bridge structures, shipyards, power generation, pipelines and pressure vessels. It also goes to repair workshops, where one station has to handle wire and electrode. 400 A at a 60% duty cycle covers thick parts in steel, stainless steel and aluminium, and 350 A at a 100% duty cycle sets the pace of work without breaks for cooling.

The system is modular. You join the power source with a chosen wire feeder, cooling unit and trolley, so you lay out the configuration for your station and add further parts later. It also makes service easier, because you replace a single module instead of the whole machine, and it makes moving the set between halls easier, because you split it into parts. The housing is made by injection moulding and shields the components against knocks and against dust, which a production hall has plenty of. The power source also holds a high energy efficiency, so at full parameters the electricity bill rises more slowly than with older builds.

A separate value are the Wise processes, which control the arc instead of the operator. They put work in order in a difficult parameter range, hold a steady penetration with a changing wire stickout and focus the arc on a narrow edge preparation. Less spatter means shorter work after welding, and a stable arc makes work in fixed positions and in deep grooves easier. Repeatable current parameters also matter where the welding process is described and controlled, because the same program gives the same result on the next shift.

Features and equipment

• Modular build: you join the power source with different wire feeders, cooling units and trolleys.
• Housing made by injection moulding, resistant to knocks and to hall conditions.
• DuraTorque feed mechanism with four rolls, which guides the wire without deformation also on long interconnection cables.
• Kinetic spool brake: the feed stops at once, so the wire does not run out after the weld ends.
• Top loading of the wire, that is access to the spool from above, which shortens a material change and limits manoeuvring in a tight place.
• Spool compartment lit by diodes, so you check the state of the wire also in a poorly lit place.
• Graphic TFT display 5.7 inch, resistant to knocks and scratches, with clear icons and fast selection of synergic programs.
• MIG/MAG welding under active and inert gases, with support for various wire diameters.
• MMA welding with a covered electrode, useful for repairs and site assembly.
• Touch Sense Ignition: striking almost without a short circuit, with minimal spatter at the start.
• WiseSteel: adaptive parameter control in the globular arc range on steel. It steadies the arc and holds the spray character also at a lower voltage, so you have less spatter and deeper penetration at the same welding speed.
• WisePenetration+: it steadies the current whatever the changes in wire stickout, so the penetration depth stays predictable in deep grooves and with difficult access.
• WiseFusion: a narrow, focused arc with a high energy density. It gives deep penetration at a lower heat input, raises the welding speed by about 25% against the standard 1-MIG process and limits thermal distortion.
• Synergic programs loaded in the power source, with support for aluminium together with the WiseFusion process.
• A menu with clear icons and simple navigation, which a less experienced operator will find their way around too.
• Support for various wire diameters, from thin sheet to thick structural parts.
• Stable current parameters, that is a repeatable result on the same program.
• The option of a fast change to MMA for repair work, also on material with a worse surface state.
• Choosing a synergic program takes a few seconds, so a changeover between materials does not stop the station for long.
• Screen resistant to knocks and scratches, prepared for workshop conditions.

Technical data

What to watch out for

Supply 400 V with a tolerance of 10%, that is an allowed range from 380 to 460 V, with a 25 A mains fuse. Check the connection and the cable section before you set up the station. The power source alone weighs 39 kg, but the set with the feeder, cooling unit and trolley moves on wheels, so for transport between halls take two people or a trolley. The housing has class IP23S: it takes dust and short work under a roof, but it does not suit standing in the rain.

The product record gives liquid cooling, and in the X5 system the cooling unit is a separate module, the same as the feeder and the trolley, so at purchase settle what the given configuration consists of. The Wise processes run on programs loaded in the power source, with an unusual wire or gas you set the parameters by hand. The wire feed speed covers a range from 0.5 to 25 m/min, and you match the rollers and liners to the diameter and type of wire, separately for aluminium. With a long interconnection cable watch how you run it and the bending radius, because that decides whether the feeder holds an even feed. You have 400 A at a 60% duty cycle, in work without breaks stay at 350 A, and it is that second number that sets the pace of production. If the set includes a cooling unit, check the level and cleanliness of the coolant after transport.

This unit is sold

This machine has already gone to a customer. Similar units are listed below, and if you want the same model, leave your contact details in the form and we will let you know when the next one arrives.