Handheld laser welder power: 1000, 1500, 2000 or 3000 W?

Buy for the thickness you weld every week. Published maker data puts a 1000 W handheld fiber laser at about 1.5–3 mm on steel in daily production, 1500 W at about 2–3.5 mm and 2000 W at about 3–4 mm, with upper figures of roughly 4, 6 and 8 mm. Few major makers publish handheld data at 3000 W, so plan on 3000 W as extra speed and margin over 2000 W.

What extra laser power buys you

Laser power trades against travel speed. EWI’s rule of thumb for carbon and stainless steel is about 1 kW of laser power for every millimetre of penetration at a travel speed of 2 m/min. At a fixed speed, more power gives a deeper weld. At a fixed depth, more power lets you move faster.

In handheld work, the operator sets the travel speed. A person can only track a joint steadily so fast, so power that only pays off at high speed is partly wasted in manual welding.

Maker presets show how much headroom a 2000 W unit has on common sheet. Lincoln Electric’s settings for its 2000 W Flex Lase weld 1 mm stainless at 25% power, 3 mm without wire at 70%, and 4 mm with wire at 65%. Most thin-sheet work uses well under half of a 2000 W source.

Typical thickness by power and metal

The table below combines published data from IPG, Miller, Lincoln Electric and Han’s Laser. It is a typical guide, not a guarantee. The first figure is the everyday production range covered by maker presets and conservative tables. The figure in brackets is the highest single-side figure a maker quotes for that power class.

Typical single-side weld thickness for handheld fiber laser welders (published maker data)

Laser power	Stainless steel	Carbon steel	Aluminium (3xxx/5xxx/6xxx)	Galvanized steel
1000 W	1.5–3 mm (up to ~4 mm)	1.5–3 mm (up to ~4 mm)	1–2 mm (up to ~3.3 mm)	1–2 mm (up to ~4 mm)
1500 W	2–3.5 mm (up to ~6 mm)	2–3.5 mm (up to ~6 mm)	2–3.5 mm (up to ~5–6 mm)	2–3.5 mm (up to ~6 mm)
2000 W	3–4 mm (up to ~8 mm)	3–4 mm (up to ~8 mm)	2–4 mm with wire (up to ~6–8 mm)	3–4 mm (up to ~8 mm)
3000 W	Few published figures*	Few published figures*	Few published figures*	Few published figures*

*None of the major makers in our sources publishes a handheld thickness table at 3000 W. Going by EWI’s rule of thumb, 50% more power gives roughly 50% more depth at the same speed, or the same depth at a higher speed. In practice, expect faster travel on 3–5 mm work and more margin on aluminium. Confirm with test coupons before you buy.

Where the numbers come from:

• Lower figures: Han’s Laser lists 1.5 mm steel at 1000 W, 3.5 mm at 1500 W and 4.0 mm at 2000 W. Lincoln’s 2000 W presets stop at 3 mm without wire and 4 mm with wire. Miller rates its OptX 1 kW for applications up to 1/8 in (3.2 mm) of penetration.
• Upper figures: IPG quotes steels up to 0.156 in (4.0 mm) for the LightWELD 1000, 0.234 in (5.9 mm) for the 1500 XR and 0.313 in (8.0 mm) for the 2000 XR. Miller rates the OptX 2 kW for up to 5/16 in (7.9 mm) of penetration.

The spread between the two figures is large because makers measure different things. A preset is a setting a new operator can repeat on a production joint. A maximum is the best case under ideal conditions. Joint type (butt, fillet or lap), gap, travel speed, focus position, shielding gas, filler wire, alloy and surface condition all move the result.

Stainless and carbon steel

Makers list stainless and carbon steel together, and their figures match. Shielding gas practice differs by maker. Lincoln’s presets use nitrogen for stainless, carbon and galvanized steel. Han’s Laser lists argon for the same steels. Follow your supplier’s settings and your welding procedure.

Aluminium

Aluminium reflects more of the beam and conducts heat away quickly. IPG’s limits for 6xxx alloys are lower than for 3xxx and 5xxx alloys: 5.8 mm against 8.3 mm at 2000 W. Lincoln’s 2000 W presets weld aluminium up to 2 mm without wire and up to 4 mm with wire, using argon. If aluminium is a large share of your work, a wire feeder matters more than the next step up in power.

Galvanized steel

Zinc boils at about 907 °C, far below the melting point of steel. The zinc turns to vapour before the steel melts. Research on laser lap joints in galvanized sheet shows that high-pressure zinc vapour at the joint interface causes spatter and porosity. Lap joints with no gap are the hardest case. Lincoln marks its galvanized presets as a “development project recommended” application. Plan test welds before you quote galvanized work.

Wobble heads

A wobble head moves the focused beam in a small, fast pattern across the joint. This widens the weld bead and helps the weld pool bridge small gaps. IPG states that wobble adds up to 5 mm (0.2 in) of weld width. Lincoln’s presets use a wobble width of 2–3 mm at 60 Hz. Han’s Laser lists a wobble range of 0–5 mm.

TWI gives the fit-up limits:

• Without wobble or wire, butt joints need a gap below about 10% of material thickness.
• Spinning or scanning the beam raises the gap tolerance to about 20–30% of thickness. Travel is slower than plain welding at the same power.

On 2 mm sheet, that means about 0.2 mm of gap without wobble and about 0.4–0.6 mm with it. Wobble is standard on most handheld units today. Check the width and frequency range, and whether you can save wobble settings with each program.

Wire feeding

TWI reports that adding filler wire raises fit-up tolerance to about 100% of sheet thickness for steels up to 6 mm. The trade-off is lower travel speed and a larger heated area. Wire also builds the throat on fillet welds and fills thicker joints. Lincoln’s autogenous steel presets stop at 3 mm, and its wire presets reach 4 mm.

IPG’s wire feed option takes wire from 0.8 to 1.6 mm. Lincoln’s presets were developed with 1.14–1.57 mm wire. Buy a wire feeder if you weld fillet joints, aluminium, parts with uneven gaps, or steel over about 3 mm.

Air-cooled or water-cooled

Both designs exist up to 2000 W. IPG’s LightWELD 1000, 1500 XR and 2000 XR are air-cooled. Han’s Laser’s HW-D series uses water cooling.

• Air-cooled: no chiller, no water to change, a lighter and smaller machine. Its cooling capacity depends on room air, so check the rated ambient temperature range and duty cycle.
• Water-cooled: a chiller holds the laser at a set water temperature, which helps on long shifts. It adds floor space, power draw and maintenance. Plan for clean water and freeze protection in cold workshops.

Single-phase or three-phase power

Many 1000–2000 W handheld welders run on single-phase power. Lincoln specifies its 2000 W Flex Lase at 230 V single-phase, drawing 26 A at rated output. Han’s Laser states 220 V single-phase or 380 V, depending on laser power.

Before you order:

• Ask for the full input rating in amps or kVA at maximum output.
• Add the chiller and wire feeder if they have their own supply.
• Have an electrician check the breaker, cable size and voltage stability at your site.
• Order the machine for your local voltage, frequency and plug type. Maxwave builds machines to the customer’s voltage and plug.

When more power is wasted

• Thin sheet. On 0.5–2 mm parts a 2000 W unit runs at a small fraction of its rating. Fine control at low power matters more here, so ask for the minimum stable output.
• Poor fit-up. Extra watts do not close a gap. TWI names clamping as the key to correct fit-up, and wobble and wire as the tools for gaps.
• Hand speed. If the operator cannot move faster, the extra power only adds heat.
• Thick plate. Above the roughly 8 mm upper figure for 2000 W, you need a bevel and several passes with wire, or an arc process. Our guide to laser welding vs TIG and MIG covers where arc welding stays ahead.

Extra power does pay off on aluminium and copper, on daily 4–6 mm steel, and on high-volume work where travel speed sets output. IPG quotes copper up to 2.1 mm at 1500 W and 3.3 mm at 2000 W, so reflective metals benefit most from more power.

How to decide

1. List your five most common jobs by material, thickness, joint type and weekly volume.
2. Pick the lowest power whose production range in the table covers most of them. Use the upper figures only as headroom.
3. Add a wire feeder for fillets, aluminium, gaps or steel over about 3 mm.
4. Choose air or water cooling based on room temperature, shift length and floor space.
5. Confirm supply voltage, phase and available current with an electrician.
6. Plan a laser controlled area and protective equipment before the machine arrives. See our handheld laser safety guide.
7. Test your real parts before you buy.

Maxwave builds handheld fiber laser welders from 300 W to 3000 W, plus a 1500 W 4-in-1 unit that welds, cuts and cleans; see the laser welding machines range. To check a power level on your own parts, send samples through sample testing and we return a test video with the settings used.